- Family
- FEPM (tetrafluoroethylene-propylene)
- Standard range
- -9 C to 232 C (Parker® O-Ring Handbook ORD 5700)
- Durometers
- By compound; the compound sheet states it
- Standards
- ASTM D1418 FEPM
- Product
- O-rings in AS568 and ISO 3601 sizes, quoted in the compound the print names
Service temperatures here are the family figures published in Parker O-Ring Handbook ORD 5700 §2.2.14; the compound datasheet and your application govern the final choice.
Larger and non-standard sizes: an O-ring beyond the molded size lists can be supplied as a spliced and vulcanized O-ring, which the maker joins from cord of the same compound. That page lists, family by family, which makers offer the compound as cord, and what to send for a quote.
Aflas O-rings are made of FEPM (a tetrafluoroethylene-propylene copolymer), the material that covers amines, steam, hot water and strong bases where FKM fails but FFKM is more than the job needs. The Parker O-Ring Handbook (ORD 5700 §2.2.14) rates FEPM from -9 C to 232 C, and it is poor in the cold; the compound sheet governs. Conquest supplies Aflas and other FEPM O-rings in AS568 and metric sizes.
Aflas (FEPM) O-ring specifications
| Property | Value | Source |
|---|---|---|
| Temperature range | -9 C to 232 C | Parker ORD 5700 §2.2.14 |
| Material designation | FEPM under ASTM D1418 | ASTM naming |
| Strong against | Amines, corrosion inhibitors, steam and hot water, bases, phosphate esters, engine oils | Parker O-Ring Handbook ORD 5700 section 2.2.14; Apple Rubber TFE/P page |
| Weak against | Aromatic fuels, ketones and chlorinated hydrocarbons; cold flexibility | Parker O-Ring Handbook ORD 5700 section 2.2.14 and Table 2-2 |
| Typical duty | Oil-field, chemical-process and general industrial seals; engine oils, steam and hot water | Apple Rubber TFE/P page; Parker O-Ring Handbook ORD 5700 section 2.2.14 |
| Related material | FFKM where the chemical list is broader still | Parker ORD 5700 |
Sizes and forms we supply
All 369 AS568 sizes (349 general-purpose dash sizes plus the 20 boss-seal sizes) and the ISO 3601 metric series, in the hardness each compound sheet states; O-ring cord for rings spliced and vulcanized by the maker in odd diameters (static service only); and X-rings and backup rings in the same families. The AS568 chart and the metric chart carry the dimensions, and the dash number guide explains the numbering.
Aflas between FKM and FFKM
| Medium | Viton® (FKM), section VII | Aflas (FEPM), section 2.2.14 lists | FFKM, section VII |
|---|---|---|---|
| Amines | Not recommended | Listed compatible | Good |
| Steam and hot water | Not recommended | Listed compatible | Excellent |
| Strong bases | Limited | Listed compatible | Excellent |
| Aromatic fuels, chlorinated solvents | Excellent | Listed not compatible | Excellent |
| Ketones | Not recommended | Listed not compatible | Excellent |
Typical applications
Oil-field tools and wellhead seals; amine and corrosion-inhibitor service in refineries and chemical plants; steam and hot-water service where oil is also present; engine oils; and process equipment handling strong bases, where FKM's chemistry runs out before FFKM is needed.
The Viton page and the FFKM page cover the neighbors; the FFKM vs Viton comparison places Aflas between them, and the chemical compatibility guide covers the media.
Sources: AS568; ASTM D1418; ISO 3601; Parker O-Ring Handbook ORD 5700, section 2.2.14, read 2026-09-14; Parker O-Ring Handbook ORD 5700, page 2-10 (hardness guidance), read 2026-09-25; Parker O-Ring Handbook ORD 5700, section 2.2.14 compatibility lists, Table 2-2 and section VII ratings, read 2026-09-27; Apple Rubber, Seal Design Guide, Tetrafluoroethylene/Propylene (AFLAS) page, read 2026-09-27.
Parker is a trademark of Parker Hannifin Corporation. Aflas is a trademark of AGC; Viton is a trademark of The Chemours Company; Apple Rubber is a trademark of its owner. No affiliation or endorsement is implied.
Frequently asked
What temperature range does Aflas have?
The Parker O-Ring Handbook rates FEPM from -9 C to 232 C; the compound datasheet governs.
Aflas or FFKM for an amine service?
Aflas where the medium is amines or steam and the compound sheet covers the temperature; FFKM where solvents or ketones are also present or the temperature is higher.
Is Aflas a brand or a material?
A trademark (AGC) for FEPM; other makers sell the same class under their own names.
Which durometer?
The compound sheet states it; for most applications the Parker handbook puts the usual choice at 70 to 80 Shore A (ORD 5700, page 2-10). The durometer guide covers the choice.
Related guides
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Send the part number and the quantity for Aflas
The AS568 dash number or the inside diameter and cross-section, the durometer, the quantity, the medium and temperature, and any specification the print names. A Conquest representative replies. Quotes answered within one business day. A person answers (714) 632-9830, Pacific business hours.
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