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  • O C Rings & Basic Seals
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  • X-Rings & Square Rings
  • O-Ring Sizing Chart
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  • Hydraulic & Fluid Seals
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  • Custom Machined Parts
  • PTFE Products
  • PTFE Rotary Shaft Seals
  •      Materials
    The proper material is critical for maximum performance. DKI utilizes a wide range of superior performance materials for every conceivable application.

    Material class and type details 

    NITRILE HYDROGENATED NITRILE FLUOROCARBON ETHYLENE-PROPYLENE
    POLYURETHANE SILICONE FLUOROSILICONE NATURAL RUBBER
    NEOPRENE STYRENE BUTADIENE POLYACRYLATE ETHYLENE ACRYLIC
    Virgin PTFE PTFE Filled ACETAL NYLON
    PEEK PSU PPSU PEI
    PET PVDF E-CTFE PPE
    PE-UHMW PVC

     

     

     

    NITRILE Rubber (NBR, Buna-N, Nitrile)

    Nitrile is the most widely used elastomer in the seal industry. The popularity of nitrile is due to its excellent resistance to petroleum products. It has good physical properties and is superior to most rubbers in regards to compression set, tear and abrasion resistance. It offers high resistance to mineral oil based hydraulic fluids, silicone greases, petroleum-based oils, water and alcohols.
    The major limiting properties of nitrile are its poor ozone and weather resistance and moderate heat resistance, but in many applications these are not limiting factors.

    Temperature Range (dry heat)

    low

    high

    -22 F
    -30 C

    212 F
    100 C

    Application Advantages

    >excellent compression set
    >good tear resistance
    >good abrasion resistance
    >good petroleum-based oils resistance
    >good mineral oil based hydraulic fluids resistance
    >good solvent, water and alcohols resistance

    Primary Uses

    Application Disadvantages

    Pneumatic seals, O-Rings, Oil seal lips, Gaskets, Washer and low pressure hydraulic seals. It can be used with a back-up ring in higher pressure applications. This is the most popular o-ring material and custom molded rubber components for:
    Oil resistant applications
    Low temperature applications
    Fuel systems, automotive, marine, and aircraft
    General Industrial Use

    poor weather resistance
    moderate heat resistance
    not suited for using in brake fluids
    Not suited for using in highly polar solvents

     

    HYDROGENATED NITRILE (HNBR)

    HNBR is achieved by hydrogenated NBR. Greatly improved wear and extrusion resistance over standard NBR. Good chemical compatibility and it is excellent heat and oil resistant including exposure to such oil additives as detergents, anti-oxidants and anti-wear agents. It also shows a up to five times higher resistance to sour gas and ozone resistance. Has an extended high temperature range.

    Temperature Range (dry heat)

    low

    high

    -22 F
    -30 C

    300 F
    149 C

    Application Advantages

    > excellent heat and oil resistance
    >improved fuel and ozone resistance
    (approximately 5X over Nitrile)
    >excellent abrasion, compression set, tensiles, and tear properties
    >exhibit better wear resistance than standard nitrile

    Primary Uses

    Application Disadvantages

    Seal and gasket application requiring additional resistance to chemicals and slightly higher temperatures than can be handled with NBR. O-Rings, washers, rod and piston seals, back-up rings, gaskets.

    increased cold flow with hydrogenation
    decreased elasticity at low temperatures with
    Hydrogenation over standard nitrile
    Not use for exposure to ketone, esters, aromatic fluids

     

    FLUOROCARBON (FKMViton)

    An excellent elastomer for use in high temperature applications. Also exhibits excellent chemical resistance, commonly referred as VITON or FKM. Fluorocarbon exhibits resistance to a broader range of chemicals combined with very good high temperature properties more so than any of the other elastomers. It is the closest available approach to a universal elastomer for sealing in the use of o-rings and other custom seals over other types of elastomers.
    Fluorocarbons are highly resistant to swelling when exposed to gasoline as well as resistant to degradation due to expose to UV light and ozone.
    In addition to standard FKM materials, a number of special materials are available with differing monomer compositions and fluorine content (65% to 71%) for improved low temperature, high temperature, or chemical resistance performance.
    Fluorocarbons exhibit low gas permeability making them well suited for hard vacuum service and many formulations are self-extinguishing. FKM materials are not generally recommended for exposure to hot water, steam, polar solvents, low molecular weight esters and ethers, glycol based brake fluids, or hot hydrofluoric or chlorosulfonic acids.

    Temperature Range (dry heat)

    low

    high

    -4 F
    -20 C

    392 F
    200 C

    Application Advantages

    >excellent chemical resistance
    >excellent heat resistance
    >good mechanical properties
    >good compression set resistance
    >Resistance to wide range of oils and solvents; specially all aliphatic, aromatic and halogenated hydrocarbons, acids, animal and vegetable oils

    Primary Uses

    Application Disadvantages

    O-rings, rubber seals and custom molded rubber components for:
    Automotive fuel handling
    Aircraft engine seals
    High temperature applications requiring good compression set performance
    Tough sealing applications requiring extreme chemical resistance
    General industrial seals and gaskets

    poor low temperature flexibility
    poor resistance to hot water and steam
    not recommended for exposure to hot water, steam, polar solvents, low molecular weight esters and ethers, glycol based brake fluids, or hot hydrofluoric or chlorosulfonic acids.

     

    ETHYLENE-PROPYLENE (EPDM)

    Ethylene-propylene compounds are used frequently to seal in brake systems, and for sealing hot water and steam.  Ethylene propylene compounds have good resistance to mild acids, detergents, alkalis, silicone oils and greases, ketones, and alcohols. They are not recommended for applications with petroleum oils, mineral oil, di-ester lubricants, or fuel exposure.
    Ethylene Propylene has gained wide seal industry acceptance for its excellent ozone and chemical resistance properties and is compatible with many polar fluids that adversely affect other elastomers.
    EPDM compounds are typically developed with a sulfur or peroxide cure system. Peroxide-cured compounds are suitable for higher temperature exposure and typically have improved compression set performance.

    Temperature Range (dry heat)

    low

    high

    -40 F
    -40 C

    302 F
    150 C

    Application Advantages

    >exceptionally good weather aging and ozone >resistance
    >excellent water and chemical resistance
    >excellent resistance to gas permeability and >aging due to exposure to steam
    >good in ketones and Alcohols
    >good heat resistance
    >good low temperature flexibility

    Primary Uses

    Application Disadvantages

    standard and special sealing applications as hydraulic or rotary seal, O-rings, flange seals and gaskets
    Water system seals, faucets, etc.
    Brake systems
    Ozone exposure applications
    Automotive cooling systems
    General Industrial Use

    poor petroleum oil and solvent resistance
    not recommended for food applications
    not recommended for exposure to aromatic hydrocarbons

     

    POLYURETHANE (AU) (EU)

    Millable polyurethane exhibits excellent abrasion resistance and tensile strength as compared to other elastomers providing superior performance in hydraulic applications with high pressures, abrasive contamination and shock loads.
    Its outstanding features are high resistance to abrasion, low compression set, high rigidity and high tear strength.
    Polyurethane is used in industrial hydraulic systems (lip seals, chevron packings, wipers, rod seals, piston seals, O-rings and special seals), where improved performance and service life is important. It is resistant to petroleum oils, hydrocarbon fuels, ozone and weathering is good.

    Temperature Range (dry heat)

    low

    high

    -22 F
    -30 C

    230 F
    110 C

    Application Advantages

    > excellent abrasion resistance
    >excellent tensile strength and high rigidity
    >low compression set
    >good resistance to petroleum oils and hydrocarbon fuels
    >good weather and ozone resistance

    Primary Uses

    Application Disadvantages

    Static and dynamic seals (standard and special), wiper, O-rings, back-up rings, flange seals, rotary seals:
    seals for high hydraulic pressure
    highly stressed parts subject to wear

    poor resistance to water
    poor high temperature capabilities

     

    SILICONE (VMQ)

    Silicone is a semi-organic elastomer with outstanding resistance to extremes of temperature with corresponding resistance to compression set and retention of flexibility. Silicone elastomers also have excellent weathering, ozone and aging properties.
    Silicone rubbers have poor mechanical properties and abrasion resistance and are therefore mainly used for static sealing applications and are not recommended for dynamic applications. Silicones are highly permeable to gases, and are generally not recommended for exposure to ketones, concentrated acids, or steam.

    Temperature Range (dry heat)

    low

    high

    -78 F
    -60 C

    392 F
    200 C

    Application Advantages

    > excellent extreme temperature properties
    >excellent compression set resistance and good resilience
    >moderate solvent resistance
    >highly resistance to oxidation and ozone attack
    very clean, low odor and taste

    Primary Uses

    Application Disadvantages

    O-rings, rubber seals and custom molded rubber components for:
    seals (static) for extreme temperature applications
    food applications
    medical devices
    FDA applications

    typically not good for dynamic seals due to friction properties and poor abrasion resistance
    not recommended for most concentrated solvents, oils, concentrated acids and dilute sodium hydroxide

     

    FLUOROSILICONE (FVMQ)

    Fluorosilicone rubber which combines the good high and low temperature stability of Silicone with the fuel oil and solvent resistance of Fluorocarbons. It is most often used in aerospace applications for systems requiring fuel and/or diester-based lubricant resistance up to a dry heat limit of 400 F. Its features good compression set and resilience properties. It is suitable for exposure to air, ozone, chlorinated and aromatic hydrocarbons.

    Fluorosilicone is designed for static sealing use. Because of its limited physical strength, poor abrasion resistance and high friction characteristics. Fluorosilicone is not recommended for dynamic sealing applications.  It is also not recommended for exposure to brake fluides, hydrazine, or ketones

    Temperature Range (dry heat)

    low

    high

    -78 F
    -60 C

    347 F
    175 C

    Application Advantages

    >excellent extreme temperature properties
    >excellent compression set resistance and good >resilience
    >good fuel oil resistance
    >very clean, low odor and taste

    Primary Uses

    Application Disadvantages

    O-rings, rubber seals and custom molded rubber components for:
    seals (static) for extreme temperature applications
    aircraft fuel systems

    typically not good for dynamic seals due to friction properties and poor abrasion resistance
    not recommended for exposure to brake fluides, hydrazine, or ketones

     

    NATURAL RUBBER (NR)

    Natural rubber is a product coagulated from the latex of the rubber tree, hevea brasiliensis. Natural rubber features low compression set, high tensile strength, resilience, abrasion and tear resistance, good friction characteristics, excellent bonding capabilities to metal substrate, and good vibration dampening characteristics

    Temperature Range (dry heat)

    low

    high

    -60 F
    -51 C

    220 F
    104 C

    Application Advantages

    > excellence compression set
    >good resilience and abrasion
    >good surface friction properties
    >high tear strength
    >low crack growth
    >good low temperature properties

    Primary Uses

    Application Disadvantages

    O-rings, rubber seals and custom molded rubber components for:
    rubber to metal bonded vibration isolators and mounts
    automotive diaphragms
    FDA applications for food and beverage seals

    poor resistance to attack by petroleum oils
    poor ozone, UV resistance

     

    NEOPRENE / CHLOROPRENE (CR)

    Neoprene homopolymer of chlorobutadiene and is unusual in that it is moderately resistant to both petroleum oils and weather (ozone, UV, oxygen). This qualifies neoprene uniquely for certain sealing applications where many other materials would not be satisfactory. Neoprene is classified as a general purpose elastomer which has relatively low compression set, good resilience and abrasion, and is flex cracking resistant.
    Neoprene has excellent adhesion qualities to metals for rubber to metal bonding applications.
    It is used extensively for sealing refrigeration fluids due to its excellence resistance to Freon and ammonia.

    Temperature Range (dry heat)

    low

    high

    -40 F
    -40 C

    250 F
    121 C

    Application Advantages

    >high resilience with low compression set
    >moderate resistance to petroleum oils
    >good resistance to ozone, UV, oxygen
    >excellence resistance to Freon and ammonia

    Primary Uses

    Application Disadvantages

    O-rings, rubber seals and custom molded rubber components for:
    refrigeration industry applications
    general purpose seals, hose and wire

    moderate water resistance
    not effective in solvents environments

     

    STYRENE BUTADIENE (SBR)

    Styrene-Butadiene (SBR) is a copolymer of styrene and butadiene.
    SBR compounds have properties similar to those of natural rubber. SBRs primary custom molded application is the use in hydraulic brakes system seals and diaphragms, with the major of the industry usage coming from the Tire Industry.
    SBR features excellent resistance to brake fluids, and good water resistance.

    Temperature Range (dry heat)

    low

    high

    -50 F
    -46 C

    212 F
    100 C

    Application Advantages

    >good resistance to brake fluids
    >good resistance to water
    >low cost non-oil resistance material

    Primary Uses

    Application Disadvantages

    O-rings, rubber seals and custom molded rubber components for:
    hydraulic brake systems seals and diaphragms
    plumbing applications

    >poor weather resistance
    >poor petroleum oil and solvent resistance

     

    POLYACRYLATE (ACM)

    Polyacrylates are copolymers of ethyl and acrylates which exhibit excellent resistance to petroleum fuels and oils and can retain their properties when sealing petroleum oils at continuous high temperatures up to 347 F. These properties make polyacrylates suitable for use in automotive automatic transmissions, steering systems, and other applications where petroleum and high temperature resistance are required.
    Polyacrylates also exhibit resistance to cracking when exposed to ozone and sunlight.
    Polyacrylates are not recommended for applications where the elastomer will be exposed to brake fluids, chlorinated hydrocarbons, alcohol, or glycols

    Temperature Range (dry heat)

    low

    high

    -60 F
    -51 C

    300 F
    149 C

    Application Advantages

    >petroleum fuel and oil resistance
    >resists flex cracking
    >good ozone resistance
    >good heat resistance

    Primary Uses

    Application Disadvantages

    O-rings, rubber seals and custom molded rubber components for:
    Automotive transmissions.
    Automotive steering systems

    poor compression set performance relative to NBR
    lesser water resistance and low temperature performance than some other elastomers

     

    ETHYLENE ACRYLIC (AEM)

    Ethylene-acrylic (Vamac ) is a terpolymer of ethylene, methyl acrylate, and an acid-containing monomer as a cure site. It exhibits properties similar to those of Polyacrylate, but with extended low temperature range and with enhanced mechanical properties.
    Ethylene-acrylic offers a high degree of oil, ozone, UV and weather resistance.

    Temperature Range (dry heat)

    low

    high

    -40 F
    -40 C

    300 F
    149 C

    Application Advantages

    >excellent vibration dampening
    >excellent heat aging characteristics
    >good dynamic property retention over a wide temperature range
    >resistance to transmission fluids, water, glycol mixtures, and alkalies

    Primary Uses

    Application Disadvantages

    O-rings, rubber seals and custom molded rubber components for:
    Automotive sealing applications.
    Automotive transmissions
    Power steering seals

    not recommended for exposure to fuel, brake fluid, aromatic hydrocarbons or phosphate esters.

     

    Virgin PTFE (Teflon Virgin)

    Teflon Virginis a tough high temperature material offering the widest range of applications. Resistant to almost all chemicals (only solid alkalies can attack Teflon), its very low coefficient of friction and high impact resistance make it suitable for wide chemical exposure situations, with emphasis on temperature extremes.
    Virgin PTFE is used for spring-energized seals, V-packings, 0-rings, back-up rings, wiper, rod and piston profiles, valve seats & seals and machined components used in the chemical industry, food processing equipment and other high temperature and low friction sealing applications.
    Virgin Teflon has the tendency to cold flow over time under load or pressure. Filled Teflon is therefore required in critical sealing situations.

    Temperature Range (dry heat)

    low

    high

    -328 F
    -200 C

    500 F
    260 C

    Application Advantages

    >excellent low friction
    >excellent extreme temperature properties
    >excellent chemical resistance
    >excellent dielectric properties

    Primary Uses

    O-rings, Spring-Energized Seals, V-packings, back-up rings, wiper, valve seats, rod & piston profiles, shaft seals, lip seals, Gaskets, guiding/bearing elements, machined components.
    Petrochemical and chemical processing
    Electrical applications
    Semi-Conductor Industry
    Food, Beverage and Pharmaceutical industries
    Laboratory applications

     

    PTFE Filled (Teflon Filled)

    Teflon Filled has improved mechanical properties over virgin Teflon. The influence of filler materials results in an increase in mechanical strength, increase in hardness, reduction of wear and/or friction, improvement in the flow strength and increase in thermal shape stability.  The most important fillers: glass, carbon, graphite, bronze, nickel, MOS2, mica, and high performance polymers and minerals.
    Glass filled PTFE, significantly improved wear resistance and heat transfer due to glass filler. Excellent for dynamic applications and for higher pressures.
    Bronze filled PTFE, improved wear resistance, hardness and compressive strength. The electrical properties and chemical resistance are reduced. Excellent for dynamic applications and pressures to 6000 psi. Graphite filled PTFE, Self lubricating. Significant increased thermal conductivity, reduced level of creep. Nickel filled PTFE, Similar to PTFE / Glass or PTFE / Bronze but with superior chemical, wear and extrusion resistance. Excellent for dynamic applications and pressures to 6000 psi.

    Temperature Range (dry heat)

    low

    high

    -328 F
    -200 C

    500 F
    260 C

    Application Advantages

    >improved wear resistance
    >improved heat transfer
    >increase in mechanical strength
    >improved extrusion resistance
    >improved low friction
    >increase in thermal conductivity

    Primary Uses

    Glass filled PTFE, excellent for dynamic applications and wear parts requiring low friction and good wear resistance and high pressure resistance.
    Bronze filled PTFE, used in dynamic sealing applications, Wear parts in hydraulic cylinders requiring load bearing along with low friction guiding parts, sealing rings
    Graphite filled PTFE, high speed applications
    Nickel filled PTFE, excellent for dynamic applications and pressures to 6000 psi.

     

    ACETAL (Delrin, POM)

    Acetal has gained widespread recognition for its reliability of performance. It has high mechanical strength, rigidity, dimensional stability, high impact strength and good abrasion.
    Acetal exhibits a high thermal stability and a high resistance to chemicals (high resistance to hydrolysis)

    Temperature Range (dry heat)

    low

    high

    -58 F
    -50 C

    230 F
    110 C

    Application Advantages

    >no microporosity
    >high strength and rigidity
    >high thermal stability
    >good electrical insulation properties
    >very good sliding properties
    >high resistance to solvents
    >very high resistance to stress cracks

    Primary Uses

    Application Disadvantages

    Wear rings, back up rings, bushings and bearings, gear wheels, parts of pumps, screws, ornamental mountings and fittings, parts for the textile industry

    not resistance to high concentrated acids
    difficult to glue and paint

     

    NYLON (PA6, PA6.6)

    Nylon has very good physical properties and is one of the most widely used engineering plastics in the industry today. PA shows a high thermostability, also high stiffness, hardness and toughness are some of its main characteristics. Due to the fact, that the good mechanical properties will be achieved only after conditioning. This material must be conditioned again after an annealing. In addition, this conditioning occurs with a longer storage in air automatically.

    Temperature Range (dry heat)

    low

    high

    -58 F
    -50 C

    230 F
    110 C

    Application Advantages

    >high strength and stiffness
    >high impact and notch impact strength
    >high heat deflection temperature
    >good at dampening
    >good abrasion resistance
    >low coefficient of friction
    >good chemical stability against organic solvents and fuels
    >food safe

    Primary Uses

    Application Disadvantages

    Wear rings, back-up rings, bearings parts (good sliding properties), gear wheels, pump parts, parts in the automotive manufacturing (e.g. lock parts, chain wheels, housings, carburetor parts, etc), sliding parts, castors( reduction of the noise level), fittings, etc

    dimension stability, electrical and mechanical properties may become affected by absorbing moisture or water

     

    PEEK

    Polyether etherketone can be used at very high temperatures (+260C) and it shows an extraordinary mechanical strength, toughness, hardness, flexural strength, trosional strength. PEEK exhibits excellent chemical resistance, very good dielectric properties up to +260C and a very good resistance to all kinds of radiation. Importantly it is self-extinguishing according to UL 94.

    Temperature Range (dry heat)

    low

    high

    -40 F
    -40 C

    500 F
    260 C

    Application Advantages

    >excellent mechanical strength
    >excellent rigidity
    >excellent thermal stability
    >excellent dimensional stability
    >excellent radiation resistance
    >excellent hydrolysis resistance

    Primary Uses

    Application Disadvantages

    Bearing shells, piston rings, valve seats, gears, seals, aviation, pump vanes, plug connectors, wafer carriers.

    notched impact strength relatively low
    low resistance to acetone

     

    PSU

    Polysulfone show great thermal stability (from -100 to +160C). PSU possess a high mechanical strength, very good dielectric properties and hydrolysis resistance. High radiation resistance and self-extinguishing. PSU has a low notch impact strength.

    Temperature Range (dry heat)

    low

    high

    -148 F
    -100 C

    320 F
    160 C

    Application Advantages

    >high strength and rigidity
    >high impact strength (also at low temperature)
    very good dimensional stability
    >high chemical resistance
    >high resistance to all kinds of radiation
    >self-extinguishing
    >low smoke emission
    >repeated sterilization

    Primary Uses

    Parts for microwave ovens, blow-dryers, food industry, pump wheels, insulators, medical industry, etc

     

    PPSU

    Polyphenylensulfone is an amorphous material, with improved impact, chemical resistance and hydrolysis resistance compared to PSU. The ususal operating temperature is with approx. 180C. The extremely high notched impact strength remains also after a heat aging.

    Temperature Range (dry heat)

    low

    high

    -58 F
    -50 C

    356 F
    180 C

    Application Advantages

    >high strength and rigidity
    >very high impact strength (also at low temperature)
    >very good dimensional stability
    >very high chemical resistance
    >high resistance to all kinds of radiation
    >self-extinguishing
    >repeated sterilization

    Primary Uses

    As with PSU but with higher chemical resistance

    PEI

    Polyetherimide has a high mechanical strength in coordination with a good chemical and heat resistance (up to +170C). good dimensional stability and creep resistance. Its under the thermoplastics singular torque strength permits the economical substitution of machining fabricated small parts from steel.

    Temperature Range (dry heat)

    low

    high

     

    338 F
    170 C

    Application Advantages

    >very high strength and rigidity
    >high torque strength and hardness
    >high thermostability
    >high weatherability
    >high radiation resistance
    >self-extinguishing

    Primary Uses

    Parts for electrical engineering, food industry and in the aircraft construction, etc.

     

    PET

    Polyethylence terephthalate shows high tensile and mechanical strength, hardness and toughness, low friction and a high dimensional stability. PET may be used at temperatures ranging from -40C to +110C.

    Temperature Range (dry heat)

    low

    high

    -40 F
    -40 C

    230 F
    110 C

    Primary Uses Application Advantages

    Bearings
    Pumps
    parts for housings
    tank lids
    cogwheels
    insulators

    >high mechanical resistance and tensile strength
    >high surface strength
    >high dimensional stability
    >high toughness
    >low coefficient of friction
    >low wear and tear
    >high chemical resistance
    >easy to varnish and polish
    >good electrical insulating properties

    Application Disadvantages

    limited dielectric properties
    sensitive to hydrolysis

     

    PVDF (Kynar)

    PVDF shows a higher tensile strength, pressure resistance and dimensional stability than the related PTFE, but friction and insulation properties are lower. PVDF has a high mechanical strength and toughness at lower temperature and its self-extinguishing. The temperature ranges from -30C to +150C

    Temperature Range (dry heat)

    low

    high

    -22 F
    -30 C

    302 F
    150 C

    Primary Uses Application Advantages

    Pumps, rotation disks, valves, fittings, glide tracks, cogwheels, chemical processing.

    >high mechanical strength and tensile strength
    >high chemical resistance
    >low water absorption
    >good friction and wear and tear values
    >self-extinguishing
    >high UV-resistance

    Application Disadvantages

    toxic fumes when burned
    can not be solvent cemented

     

    E-CTFE (Halar)

    E-CTFE exhibits an extraordinary impact strength at temperatures ranging from -76C to +150C. A great part of the product properties attributes to the very smooth surface and differentiates Halar from other fluoropolymers. Due to the fact that E-CTFE is very pure, this material is being used to process chemicals and ultrapure water for the semiconductor industry. Also the permeation resistance to oxygen, carbon dioxide, chlorine gas and hydrochlorid acid is 10 to 100 times better than PTFE.

    Temperature Range (dry heat)

    low

    high

    -105 F
    -76 C

    302 F
    150 C

    Primary Uses Application Advantages

    Parts which come in contact with aggressive materials (e.g. machine-making industry). Lining of tanks, pumps, flanges, fitting, parts in centrifuges and control engineering industry etc

    >extremely high impact strength(up to -40C)
    >good insulation properties
    >very good weather resistance
    >high resistance to radiation
    >very high chemical resistance
    >self-extinguishing
    >very good sliding properties
    >food safe

    Application Disadvantages

    high density
    limited protection against stress cracking at temperatures > 140C

     

    PPE

    PPE belongs to the group of the amorphous materials and can be used in temperatures ranging from -50 to +105C.
    PPE exhibits a high impact strength and a very high dimensional stability. The electrical properties will not be influenced by the surrounding frequencies and therefore can be used in a lot of applications in electrical engineering.

    Temperature Range (dry heat)

    low

    high

    -58 F
    -50 C

    221 F
    105 C

    Primary Uses Application Advantages

    parts for electrical engineering and household utensils, shafts, gear wheels, etc.

    >high dimensional stability
    >low tendency to creep
    >high thermostability and impact strength
    >good electrical properties over a far frequency range
    >high resistance to hydrolysis
    >self-extinguishing

     

    PE-UHMW

    PE-UHMW offer resistance to almost all acids and bases, detergents and hot water. PE-UHMW has good insulation properties and is easy to weld. The operating temperature of PE-UHMW is from -150C and +90C.

    Temperature Range (dry heat)

    low

    high

    -238 F
    -150 C

    194 F
    90 C

    Primary Uses Application Advantages

    Sewage industry
    pumps and valves
    seals
    medical industry

    >very low friction
    >low density
    >high toughness(also at low temperature)
    >high elongation
    >very good electrical and dielectric properties
    >very low water absorption
    >low steam permeability
    >high chemical resistance
    >good protection against stress cracking
    >food safe

    Application Disadvantages

    high density
    limited protection against stress cracking at temperatures > 140C

     

    PVC

    PVC is rated self-extinguishing, has an exceptional chemical resistance and is easy to machine. PVC shows high mechanical strengths, tensile strength and can be used in application ranging in temperature from -15C to +60C. it can also be easily solvent cemented and welded.

    Temperature Range (dry heat)

    low

    high

    5F
    -15 C

    140F
    60C

    Primary Uses Application Advantages

    Pumps and valves, seals, pipe systems, bearings, brush industry,
    Lamp housing, parts for the dental industry, chemical tanks

    >high mechanical strength, tensile strength and hardness
    >good insulation properties
    >high chemical resistance
    >self-extinguishing
    >low water absorption
    >easy to varnish and glue

    Application Disadvantages

    low impact strength
    limited weather resistance

      DKI Rubber & Plastic Ltd
    No9, Helong Road, Jiahe, BaiYun District, Guangzhou, 510440 CHINA
    Tel:+86 20 36013580   +86 20 36013581  Fax:+86 20 36013583 Email: sales@dkirubber.com
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