Seal material selection must account for media compatibility, continuous and peak temperature, pressure, surface speed, wear, friction, compression set, cleanliness and target service life. This guide compares PTFE compounds, engineering plastics, elastomers and corrosion-resistant metals in one engineering reference for preliminary material screening, maintenance replacement and new equipment development.
Seal Material Properties and Selection
Compare PTFE formulations, engineering plastics and elastomers by temperature range, hardness, shaft requirement, dry wear, chemical resistance and typical sealing application.
| Mat. ID | Comp. | Temp. (°C) | Mat. H. | Shaft H. (min.) | DWL | Apps. |
|---|---|---|---|---|---|---|
| 1760 | Virgin PTFE | -90/240 | D62 | 170HB | 500 | High-purity virgin PTFE; FDA food grade. Suitable for low-temperature or food-contact media and static sealing. Its relatively low wear resistance makes it unsuitable for dynamic sealing. |
| 1776 | PTFE + CF | -100/260 | D65 | 40HRC | 30 | Carbon-fiber-filled PTFE with improved wear resistance and thermal conductivity for fluids and abrasive-media sealing. |
| 1783 | PTFE + CF | -100/260 | D65 | 40HRC | 8 | Carbon fiber and self-lubricating fillers provide better dry-running wear resistance and high thermal conductivity for fluids and abrasive media. |
| 1845 | Imported PTFE | -180/260 | D60 | 200HB | 4.0 | High tensile strength with solvent, acid and alkali resistance. FDA food grade; suitable for oil-free, non-abrasive powder sealing against 304/316L stainless steel rotary shafts, including food-grade mixers. |
| 1852 | Imported PTFE | -100/260 | D55 | 50HRC | 1.4 | Food-grade, low-hardness and low-torque grade for oil-free abrasive powders or lightly oil-splashed service. Typical equipment includes vacuum pumps, gear reducers, mixers and dispersers. |
| 1865 | Imported PTFE | -100/260 | D64 | 55HRC | 6 | Molybdenum-disulfide-filled grade with high pressure, temperature and wear resistance for long-term oil-immersed or powder-exposed service in compressors, vacuum pumps and mixers. |
| 1885 | PTFE + BRZ | -100/260 | D58 | 30HRC | 4 | Bronze-filled PTFE with self-lubricating and corrosion-resistant properties for lightly lubricated, noncorrosive seals and guide rings. |
| 2159 | Imported PTFE | -100/260 | D62 | 58HRC | 7 | Improved 1865 molybdenum-disulfide-filled grade for high pressure, high temperature and long-term sealing in compressors, vacuum pumps and mixers. |
| 3150 | PTFE + G | -100/260 | D55 | 170HB | 10 | Graphite-filled PTFE with strong creep, wear and corrosion resistance for corrosive-gas sealing. |
| 3180 | Imported PTFE | -100/260 | D60 | 170HB | 10 | Low underwater wear with resistance to hot steam, acids, alkalis, DMF, NMP, THF, DMAC, ketones, ethers and amines. Recommended for underwater sealing against 304/316 stainless steel or ceramic shafts. |
| 3190 | Imported PTFE | -100/260 | D65 | 50HRC | 3 | Self-lubricating, corrosion-resistant and wear-resistant grade for high-pressure fluids containing abrasive media, including coolants, paints and coatings. |
| 3954 | Imported PTFE | -100/260 | D55 | 100HB | 3.3 | FDA food grade with 0.02% water absorption and good dimensional stability. Suitable for softer shafts and acidic service; not recommended for alkalis or polar solvents. Used in filling machines and vacuum pumps. |
| 3965 | Imported PTFE | -100/260 | D56 | 100HB | 1.3 | Improved 3960 grade; FDA food grade with low hardness and strong self-lubrication. Suitable for softer shafts, oil-free vacuum, dry-running dust and gas sealing. Not recommended for alkalis. |
| 3976 | Imported PTFE | -100/260 | D50 | 100HB | 2.8 | Low-hardness, self-lubricating FDA grade for softer shafts and high-temperature water-vapor sealing at high speed, including powered handpieces. |
| 4010 | Imported UPE | -260/100 | D55 | 100HB | 1 | Imported modified ultra-high-molecular-weight polyethylene with food-grade certification, strong self-lubrication and outstanding cryogenic performance for liquid sealing. |
| 4017 | Imported PEEK | -140/260 | D80 | 20HRC | 1 | Improved 4016 PEEK grade with greater toughness, better self-lubrication and a lower friction coefficient, especially for viscous adhesive sealing. |
| 4030 | PI | -270/300 | D85 | 170HB | 1 | Polyimide with high strength and insulation, radiation and corrosion resistance, self-lubrication, low moisture expansion and low thermal expansion. |
| 4040 | PEI | -270/300 | D85 | 170HB | 1 | Polyetherimide with broad temperature capability, good self-lubrication and food-contact certification. Insoluble in organic solvents and stable in dilute acids, but with limited hydrolysis resistance; used in aerospace and laser equipment. |
| 4045 | PAI | -200/280 | D85 | 170HB | 1 | Polyamide-imide with high strength and insulation, radiation and corrosion resistance, self-lubrication, low moisture expansion and low thermal expansion. |
| 4055 | PCTFE | -300/120 | D80 | 170HB | 5 | Polychlorotrifluoroethylene with extremely low water absorption, good mechanical and electrical insulation properties, creep resistance and chemical stability second only to PTFE. |
| 4065 | PPL | -60/280 | D55 | 50HRC | 30 | PPL filler with stronger self-lubrication than molybdenum disulfide or graphite, a very low friction coefficient, good wear resistance and excellent chemical stability. |
| 4075 | PA6 | -60/80 | D50 | 170HB | 100 | Economical nylon 6 with good resilience, wear and fatigue resistance. It absorbs moisture and has limited light and heat resistance. |
| 4085 | POM | -40/100 | D50 | 20HRC | 50 | Polyoxymethylene with good physical, mechanical and chemical properties, low friction, high mechanical strength, rigidity and fatigue resistance. |
| 6010 | TPCE | -40/135 | D65 | 40HRC | 1.5 | Thermoplastic copolyester elastomer with high tear strength, wear resistance, toughness, resilience and creep resistance. Resists steam, weak organic acids, nitrate and carbonate solutions, petroleum- and water-based fluids, phosphate esters, chlorinated fluids and solvents. Used for anti-extrusion fluid seals in high-pressure waterjet and adhesive-valve service. |
| 9010 | NBR | -40/120 | A65 | 180HB | 500 | Nitrile rubber with good oil, wear and heat resistance and strong bonding. Limitations include poor low-temperature, ozone and electrical-insulation performance and slightly lower elasticity. |
| 9020 | VMQ | -70/220 | A60 | 180HB | 500 | Silicone rubber with heat resistance, low-temperature elasticity and excellent oxidation and ozone resistance. It has high gas permeability and selective gas transmission. |
| 9030 | EPDM | -50/150 | A70 | 180HB | 500 | EPDM with excellent ozone, heat, weathering and aging resistance. Resists many chemicals, acids, alkalis, detergents, animal and vegetable oils, alcohols and ketones. |
| 9040 | PU | -40/90 | A90 | 180HB | 300 | Polyurethane elastomer with hydrolysis and oil resistance, high hardness and elasticity, strong wear and tear resistance, aging, ozone and radiation resistance, and good electrical conductivity. |
| 9090 | FKM26 | -20/250 | A75 | 180HB | 300 | Fluoroelastomer with high chemical stability. Resists petroleum oils, diesters, silicone oils, silicate oils, inorganic acids and many solvents and chemicals. Not recommended for low-molecular-weight ketones, ethers, esters, amines, ammonia, hydrofluoric acid, chlorosulfonic acid or phosphate hydraulic fluids. |
| 9091 | FKM246 | -30/300 | A75 | 180HB | 200 | High-fluorine FKM with better corrosion, oil and high-temperature resistance than 9090; recommended continuous service temperature up to 260°C. |
| 9110 | FFKM | -15/330 | A75 | 180HB | 200 | FFKM compatible alternative for Kalrez 7075 service. Continuous use to 330°C and short-term use to 350°C, with strong acid and alkali resistance and elastic sealing retention at high temperature and pressure. Used in semiconductor, oil and gas, and chemical service. |
| 9120 | FFKM | -15/280 | A75 | 180HB | 200 | FFKM compatible alternative for Kalrez 6375 service. Broad resistance to acids, alkalis, ketones, ethers and amines; suitable for general high-pressure sealing, hot water and steam in chemical and pharmaceutical service. |
| 9130 | FFKM | -15/315 | A75 | 180HB | 200 | FFKM compatible alternative for Kalrez 4079 service. Maintains sealing at high temperature and pressure but is not recommended for amines or hot water and steam. Used in corrosive chemical, oil and gas environments where ultra-high cleanliness is not required. |
| 9140 | FFKM | -15/315 | A70 | 180HB | 200 | FFKM compatible alternative for Kalrez 9100 service, with plasma resistance, low outgassing, low compression set, strong elastic recovery and ultra-high cleanliness for semiconductor manufacturing and plasma deposition. |
Seal Metal Selection
Compare stainless steels and high-performance alloys for seal cases and energizer springs by composition, temperature capability, corrosion resistance and recommended service.
| Mat. | Comp. | Temp. | Corr. | Props./Apps. |
|---|---|---|---|---|
| SS304 | Cr19Ni10Fe71 | -100°C to 400°C | 1 | 304 stainless steel with good corrosion and heat resistance. Not recommended for salt, seawater, strong acids or strong alkalis. Commonly used for rotary seal cases and O, U, S and C energizer springs. |
| SS316L | Cr17Ni12Mo2Fe69 | -120°C to 400°C | 3 | Molybdenum-bearing 316L stainless steel with better corrosion resistance to salt, seawater and moderate acids and alkalis. Used for seawater rotary seals, food-grade shaft seals and U, S and C springs. |
| SS2205 | Cr22Ni5Mo3Fe67 | -120°C to 400°C | 6 | 2205 duplex stainless steel provides higher pressure strength and hardness than conventional stainless steel with improved corrosion resistance for rotary shaft seals in aggressive environments. |
| 17-7PH | Cr17Ni7Al1Fe75 | -120°C to 450°C | 6 | Precipitation-hardening stainless alloy with high strength, toughness, conductivity, tensile performance and elastic recovery. Spring performance above 316°C exceeds 300-series stainless steel; commonly used for C springs. |
| Hastelloy C276 | Ni59Mo16Cr15Fe6W4 | -180°C to 400°C | 10 | Nickel-molybdenum-chromium alloy resistant to pitting, crevice corrosion, stress-corrosion cracking, chlorine, hypochlorite and chlorine-dioxide solutions. Used for U, S and C springs in chemical, aerospace and acidic service. |
| Inconel 718 | Ni54Cr20Fe17Nb5Mo3Ti1 | -200°C to 650°C | 15 | Nickel-chromium-niobium-molybdenum alloy with high strength, corrosion resistance and cryogenic capability for liquid-fuel rockets, cryogenic and nuclear engineering, and acidic service. Used for S and C springs. |
| Elgiloy | Co40Cr20Fe16Ni15Mo7Mn2 | -180°C to 450°C | 20 | Nonmagnetic cobalt-chromium-nickel-molybdenum alloy with excellent corrosion resistance and fatigue strength for rocket engines, oil and gas production, medical and space applications. Used for S and C springs. |
Application Data Required for Material Selection
Media and CleanlinessIdentify oil, water, steam, acids, alkalis, solvents, gases, powders, food-contact or semiconductor-clean service, then evaluate swelling, extraction and contamination risks.
Temperature and PressureProvide continuous and peak temperature, working pressure, differential direction and pressure-cycle frequency to avoid operating beyond the material limit.
Motion and WearConfirm rotary, reciprocating, static or face sealing, together with surface speed, lubrication, shaft finish and dry-running risk.
Geometry and Service LifeReview groove dimensions, assembly method, elastic compensation, extrusion resistance and target life before finalizing the material and seal structure.
Need Help Confirming a Material System?
When media, temperature, pressure, speed or service-life requirements overlap, send the operating conditions, equipment drawing or sample details. Ceimin will assess the material formulation, seal structure and manufacturing constraints together.
Submit Operating Conditionsorcontact Ceimin engineering support