Seal structure selection requires the motion type, sealing direction, material system, temperature, pressure, surface speed, media, installation space and target service life to be considered together. This guide combines Ceimin seal profiles and spring types in one engineering reference, covering non-contact labyrinth seals, spring-energized seals, integral PTFE oil seals, PTFE stainless steel oil seals, rubber oil seals, rotary seals, reciprocating seals and static face seals.
Seal Profile Selection Chart
Compare seal structures and profile codes by motion, sealing direction, standard material, temperature, pressure, surface speed and typical application to shortlist a suitable sealing concept.
| Code | DWG | Dir. | Mat. | Temp. (°C) | Press. (MPa) | v (m/s) | App. |
|---|---|---|---|---|---|---|---|
| CSL |  | Rotary | PTFE + SS | 260 | 1.0 | 25 | PTFE single lip with low torque, friction and heat generation. IP67. For vacuum, unpressurized or low-pressure rotary shaft sealing in mixers, vacuum pumps and gear reducers. |
| CDL |  | Rotary | PTFE + SS | 260 | 1.0 | 25 | Two lips facing the same direction. Lower leakage than a single lip but with higher heat generation. IP68; available with or without a hydrodynamic thread. Common in screw compressors, mixers and vacuum pumps. |
| CTL |  | Rotary | PTFE + SS | 260 | 1.0 | 25 | Triple-lip design with an added reverse dust-exclusion lip. Better contaminant exclusion than a dual lip, with higher heat generation. For low-leakage sealing in dusty compressors and EV motors. |
| ESL |  | Rotary | PTFE + SS | 260 | 1.0 | 25 | Reverse single exclusion lip that blocks powder and moisture from the housing. Low torque and heat generation, IP67. For unpressurized or low-pressure rotary shafts in high-speed mixers and gear reducers. |
| EDL |  | Rotary | PTFE + SS | 260 | 1.0 | 25 | Reverse dual-lip design with an additional inward sealing lip for improved retention and exclusion. Prevents powder and moisture ingress. IP68; used in mixers and gear reducers. |
| SML |  | Rotary | PTFE + SS | 260 | 1.0 | 25 | Opposed lip arrangement for separating two media and handling positive-to-vacuum pressure transitions, with higher pressure on one side. Used in vacuum pumps and mixers. |
| SVL |  | Rotary | PTFE + SS | 260 | 1.0 | 10 | Single lip energized by an O-type spring, equivalent to SA1J. Improved shaft conformity and a smaller contact area for powder isolation; accommodates shaft runout up to 0.5 mm. Used in powder mixing and chemical-liquid sealing. |
| TSL |  | Rotary | PTFE + SS | 260 | 0.3 | 60 | High-speed single lip with torque as low as 0.05 N·m and low heat generation. For oil-gas mixtures and low-pressure, high-speed rotary shafts in vacuum pumps and high-speed motors. |
| SRL |  | Rotary | PTFE + SS | 260 | 0.5 | 50 | High-speed single lip with torque as low as 0.02 N·m for low-temperature operation on unpressurized, small-diameter rotary shafts, including powered handpieces. |
| LYF |  | Rotary | Stainless steel | -200~+350 | 0 | No lip-friction limit | LYF non-contact labyrinth seal with no traditional lip-friction speed limit. Blocks oil mist and dust without contact wear or frictional power loss. Commonly installed ahead of a PTFE lip seal in vacuum pumps; actual speed requires application confirmation. |
| PSL |  | Rotary | PTFE + SS | 260 | 4.0 | 10 | High-pressure single lip with more heat generation than CSL. IP68. Suitable for viscous or abrasive media and rotary shaft pressures up to 4 MPa. |
| PDL |  | Rotary | PTFE + SS | 260 | 6.0 | 10 | High-pressure dual lip with better sealing and more heat generation than PSL. IP69. Designed for two-stage screw compressors and rotary shaft pressures up to 6 MPa. |
| FPL |  | Rotary | PTFE + SS | 260 | 1.0 | 25 | Opposed lips with purge-gas ports and pressure capability on both sides. For powder sealing with gas purging, including mixers. |
| HDL |  | Rotary | PTFE + SS + elastomer | 260 | 1.0 | 25 | Dual lips with purge-gas ports and an OD O-ring. For powder sealing with gas purging in mixers. |
| RDL |  | Rotary | PTFE + SS + elastomer | 260 | 1.0 | 25 | Dual lips energized by O-rings for easier removal and installation. Suitable for food-contact media sealing in mixers. |
| ZSL |  | Rotary | PTFE + SS | 260 | 0.5 | 25 | Single lip for compact, high-speed dust and water exclusion with a 3-5 mm section. Low friction torque and heat generation; used on machine-tool spindles. |
| LIP |  | Rotary / recip. | PTFE | 260 | 1.0 | 25 | PTFE sealing lip integrated into a compact housing. Can be combined with mechanical or labyrinth seals for multistage rotary sealing and used as a pneumatic cup seal in dispensing valves. |
| STS |  | Scroll | PTFE | 260 | 0.5 | 25 | Oil-free, self-lubricating scroll vacuum pump tip seal with short run-in time and low friction to reduce pump power and support a lower ultimate pressure. |
| SEL |  | Rotary | PTFE | 260 | 0.3 | 25 | Reverse single lip without a metal case. Easy to install, corrosion resistant and low friction; excludes powder and water from the housing. |
| DEL |  | Rotary | PTFE | 260 | 1.0 | 25 | Reverse dual lip without a metal case. Easy to install with improved exclusion, corrosion resistance and low friction for powder and water ingress protection. |
| NSL |  | Rotary | PTFE | 260 | 0.5 | 25 | Single lip without a metal case. Easy to install and corrosion resistant with low friction, but requires an axial retaining plate for dimensional stability. |
| LSL |  | Rotary | PTFE + SS | 260 | 0.5 | 25 | Single lip with a supporting metal case. More dimensionally stable than NSL and easier to install than CSL, with corrosion resistance and low friction. |
| NDL |  | Rotary | PTFE | 260 | 1.0 | 25 | Dual lip without a metal case. Easy to install and corrosion resistant for standard rotary sealing. |
| OSL |  | Rotary | PTFE + elastomer | 260 | 0.5 | 25 | Single lip with an O-ring and no metal case. Easy to install with low friction. |
| MSL |  | Rotary | PTFE + SS + elastomer | 260 | 0.5 | 25 | Single lip with an O-ring and internal metal support for improved dimensional stability, easier removal and low friction. |
| OEL |  | Rotary | PTFE + elastomer | 260 | 0.5 | 25 | Reverse single exclusion lip with an O-ring and no metal case. Easy to install and low friction for dust exclusion. |
| ODL |  | Rotary | PTFE + elastomer | 260 | 1.0 | 25 | Dual lip with an O-ring and no metal case. Easy to install for standard dual-lip sealing; not recommended for large temperature cycling. |
| OML |  | Rotary | PTFE + elastomer | 260 | 1.0 | 25 | Opposed lips with an O-ring and no metal case. Easy to install for separating two media. |
| DSL |  | Rotary | PTFE + elastomer | 260 | 0.3 | 25 | Single lip with an O-ring and no metal case, designed for compressor dust exclusion. |
| SC |  | Rotary | Elastomer + metal + spring | 120/230 | 0.03 | 25 | Elastomer single lip with a garter spring. The rubber-covered OD can seal in softer alloy or plastic bores. For well-lubricated high-speed or oil-free low-speed rotary shafts at low or zero pressure. |
| TC |  | Rotary | NBR + metal + spring | 120/230 | 0.03 | 25 | Elastomer single lip with dust lip and garter spring. The rubber-covered OD can seal in softer alloy or plastic bores. For lubricated high-speed or oil-free low-speed rotary shafts at low or zero pressure. |
| SB |  | Rotary | Elastomer + metal + spring | 120/230 | 0.03 | 25 | Metal-OD single lip with a garter spring for steel and cast-iron bores. For lubricated high-speed or oil-free low-speed rotary shafts at low or zero pressure. |
| TB |  | Rotary | Elastomer + metal + spring | 120/230 | 0.03 | 25 | Metal-OD single lip with dust lip and garter spring for steel and cast-iron bores. For lubricated high-speed or oil-free low-speed rotary shafts at low or zero pressure. |
| SA |  | Rotary | Elastomer + metal + spring | 120/230 | 0.03 | 25 | Double-metal-case single lip with a garter spring. The stable construction suits larger diameters and low- or zero-pressure rotary shafts with lubricated high-speed or oil-free low-speed service. |
| TA |  | Rotary | Elastomer + metal + spring | 120/230 | 0.03 | 25 | Double-metal-case single lip with dust lip and garter spring. Stable for larger diameters and low- or zero-pressure rotary shafts with lubricated high-speed or oil-free low-speed service. |
| UFI |  | Rod / rotary | PTFE/PEEK/UPE + spring | 260 | 20~70 | 10 | Rod seal with inward sealing diameter. Used for reciprocating piston rods and axially retained rotary seals in compact spaces, including dispensing valves and fuel pumps. |
| SRI |  | Rod / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 10 | Low-friction rod seal for long-duration low-pressure service. Used for reciprocating rods and compact axially retained rotary seals, including chromatography equipment. |
| ORI |  | Rod / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 10 | Rod seal with inward sealing diameter for reciprocating piston rods and compact axially retained rotary seals, including dispensing valves. |
| FFV |  | Rod / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 15 | Flanged seal for high-pressure, low-speed rotary shafts and reciprocating piston rods. |
| FFS |  | Rod / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 15 | Flanged seal for high-pressure, low-speed rotary shafts and reciprocating rods, with lower friction than FFV. |
| FBC |  | Rod / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 0.5 | Flanged seal for high-pressure, low-speed rotary shafts and reciprocating piston rods. |
| RSV |  | Rod / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 10 | OD O-ring improves static bore sealing. For high-pressure, low-speed rotary and reciprocating rod motion, separately or simultaneously. Caseless and removable; requires an axial retaining plate. |
| RSS |  | Rod / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 10 | OD O-ring improves static bore sealing. For high-pressure, low-speed rotary and reciprocating rod motion. Caseless and removable with axial retention; lower friction than RSV. |
| RSC |  | Rod / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 0.5 | OD O-ring improves static bore sealing. For high-pressure, low-speed rotary and reciprocating rod motion. Caseless and removable with axial retention; higher friction than RSV. |
| UFA |  | Piston / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 10 | Piston seal with outward sealing diameter. Used for reciprocating pistons and compact axially retained rotary seals, including filling machines. |
| SRA |  | Piston / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 10 | Low-friction piston seal for long-duration low-pressure service. Used for reciprocating pistons and compact axially retained rotary seals, including vacuum pumps. |
| ORA |  | Piston / rotary | PTFE/PEEK/UPE | 260 | 20~70 | 10 | Piston seal with outward sealing diameter for reciprocating pistons and compact axially retained rotary seals, including filling machines. |
| OFB |  | Rod / piston | PTFE/PEEK/UPE | 135 | 70 | 0.5 | Bidirectional rod/piston profile with symmetric lips for wiping fluid films and contaminants. A retaining gland enables bidirectional sealing; back-to-back installation is not recommended. For extended extrusion resistance and fluid compatibility in plunger pumps. |
| OEB |  | Rod / piston | PTFE/PEEK/UPE | 135 | 70 | 0.5 | Rod/piston profile with symmetric lips for one-way sealing; use back-to-back for bidirectional service. More aggressive wiping than OFB for high-pressure, high-viscosity fluids in dispensing valves. |
| URB |  | Rod / piston | PTFE/PEEK/UPE | 260 | 20~70 | 10 | Rod/piston seal with a radiused contact surface and U spring for medium energizing force. Used in low-speed rotary and reciprocating service, including rotary unions. |
| CRB |  | Rod / piston | PTFE/PEEK/UPE | 260 | 20~70 | 0.5 | Rod/piston seal with a radiused contact surface and C spring for high preload. Replaces O-rings in ultra-high-pressure static and cryogenic LOX/LN2 service, with limited low-speed rotary or reciprocating duty in rotary unions, LNG fueling nozzles and aerospace equipment. |
| UBI |  | Face, inward | PTFE/PEEK/UPE | 260 | 25 | 10 | Inward-facing static seal that replaces an O-ring with higher corrosion, pressure and temperature capability. Used in laser cutting heads. |
| UCI |  | Face, inward | PTFE/PEEK/UPE | 260 | 25 | 10 | Inward-facing static seal that replaces an O-ring with higher corrosion, pressure and temperature capability. Used in laser cutting heads. |
| UBA |  | Face, outward | PTFE/PEEK/UPE | 260 | 25 | 10 | Outward-facing static seal that replaces an O-ring with higher corrosion, pressure and temperature capability. Used in laser cutting heads. |
| UCA |  | Face, outward | PTFE/PEEK/UPE | 260 | 25 | 10 | Outward-facing static seal that replaces an O-ring with higher corrosion, pressure and temperature capability. Used in laser cutting heads. |
Spring Type Selection Chart
Compare O, U, S and C spring designs by sealing direction, spring load, compensation capability, friction and installation space when selecting a spring-energized seal.
| Code | DWG | Dir. | Mat. | Spr. F. | Defl. | App. |
|---|---|---|---|---|---|---|
| O |  | Rod/Piston/Rotary | PTFE/SS304/316L | 3 | 2 | O Spring, loaded within a medium compression range, used in rubber oil seal, PTFE SEAL VA1J. |
| U |  | Rod/Piston/Rotary | PTFE/SS304/316L | 2 | 2 | U Spring, wider spring load and larger compensation capacity, used in Rod/Piston seals. |
| S |  | Rod/Piston/Rotary | PTFE/SS304/316L | 1 | 4 | Canted Coil Spring, low friction, stable spring load with long-term sealing, large compression range. |
| C |  | Rod/Piston/Static | PTFE/SS304/316L | 5 | 1 | Helical Spring, large spring load within a small compression range. Excellent for high pressure, static sealing, cryogenic sealing. |
Application Data Required for Seal Selection
Seal Location and MotionConfirm shaft, bore, combined shaft-and-bore, inward face, outward face or static sealing, together with rotary, reciprocating, oscillating, unidirectional or bidirectional motion.
Media and Operating EnvironmentIdentify oil, water, steam, gas, powder, acid, alkali, solvent, food contact, vacuum or clean service, and evaluate corrosion, crystallization, contamination and dry-running risks.
Temperature, Pressure and SpeedProvide continuous and peak temperature, working pressure, pressure direction and cycles, surface speed, start-stop frequency and lubrication condition.
Housing, Shaft and Service LifeConfirm shaft and bore diameters, groove dimensions, surface finish, hardness, runout, assembly method and target life to verify the lip, spring and support design.
Need Help Confirming a Seal Profile?
When media, temperature, pressure, speed or service-life requirements overlap, send the actual operating conditions, equipment drawing or sample information. Ceimin will evaluate the material formulation, seal structure and manufacturing constraints together.
Submit Operating Conditionsorcontact Ceimin engineering support