Products
Rubber compounds by family
If your print names a compound rather than a part, this is the page for it. Conquest Seal supplies the elastomer families the trade uses, in standard grades and in the AMS and MIL specification grades a drawing can call out. The compounds come from the compounders and molders we source from, with a data sheet on request. Tell us the compound or specification your print calls out, with the medium and the temperature, and a Conquest representative quotes to it and sends the maker's data sheet.
- Families
- FFKM, FKM, FVMQ, VMQ, HNBR, EPDM, NBR, AEM
- Hardness
- by compound; each compound's data sheet states its Shore A hardness
- Service temperature
- -73 C to 320 C by family on the Parker® ranges (Parker O-Ring Handbook ORD 5700, section 2.2, read 2026-09-14); FFKM -26 C to 320 C (ORD 5700 page 7-2, read 2026-09-25); named grades reach 327 C (Kalrez® 7075) and -42 C (Kalrez 0040) on the Kalrez product selector guide KZE-A40126, read 2026-09-14
- Specifications
- AMS and MIL specification compounds on request
- Colors
- black and colored compounds by family
- Data
- compound data sheets on request
Each elastomer family has a job: FKM for fuels, oils and heat, EPDM for steam, water and ozone, silicone for wide temperature swings and clean service, HNBR for oil at higher temperatures, nitrile for general hydraulic and pneumatic work, FFKM where nothing else survives the chemistry. The compounds we supply come from the compounders and molders we source from, with AMS and MIL specification grades on request. Every lot ships with its certificate of conformance. Tell us the compound or specification your print calls out, with the media and the temperature, and we quote to it and send the maker's data sheet.
Whether you need a standard compound for an AS568 O-ring or a specification grade for an aerospace or defense program, send the drawing, the specification and the quantity and we quote it.
Prints call out compounds by need: peroxide-cured EPDM for steam, low-temperature FKM for aerospace fuels, food-contact and medical grades where the documentation matters. Tell us the compound or specification your print calls out, with the media and the temperature, and we quote to it and send the maker's data sheet.
Specialty families
The less common elastomers, one page each
Beyond nitrile, EPDM, FKM, silicone and FFKM, a print can call out a family chosen for one property. Butyl is the low gas-permeability seal; epichlorohydrin resists oil and fuel like nitrile and adds ozone and weather resistance; polyacrylate and ethylene-acrylic handle hot transmission and engine oils. Neoprene serves refrigerants and weather, while natural rubber and SBR serve water service and abrasion at low cost. As sheet for cut gaskets, chlorosulfonated polyethylene (CSM) covers outdoor and oxidizing-chemical service and red rubber (SBR) general water and air flanges.
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution. The certificate, CONQ-001, is on the certificate page, and what ships with each part is on the quality and certifications page.
Kalrez is a trademark of Qnity Electronics; Parker is a trademark of Parker Hannifin Corporation. No affiliation or endorsement is implied.
Industries that buy rubber compounds by family
Frequently asked
Can a compound from one maker be crossed to another?
Only through the specification, never through the compound number. A cross is a match on polymer family, hardness and the tests the print calls out, an ASTM D2000 line callout or an AMS document, and the replacement compound's datasheet has to show the same results. A D2000 letter pair is an envelope rather than a material identity (BG covers both nitrile and polyurethane), so a letter match alone is not a cross.
What is a low-temperature fluorocarbon?
A fluorocarbon grade built for cold starts. Standard fluorocarbon runs from -26 C on the Parker ranges, and the handbook's special low-temperature compounds reach -46 C (Parker O-Ring Handbook ORD 5700, section 2.2.7, read 2026-09-14). Aerospace prints call out a low-temperature grade through SAE AMS7379, whose title gives a glass transition temperature of -40 C (SAE Mobilus record, read 2026-09-25). They keep the fuel and heat resistance the family is chosen for.
Are colored compounds available?
Yes, in most families. We list fluorocarbon in black, blue, brown, gray, green, red and tan, fluorosilicone in blue, green, red and yellow, EPDM in black, purple and red, and nitrile in black. Color is pigment: a ring is identified by its compound number and datasheet, never by its color.
Which compounds are made to AMS and MIL specifications?
Fluorocarbon to AMS7276 (70 to 80 Shore A) and AMS7259 (85 to 95 Shore A), the documents behind the M83248/1 and M83248/2 part families; FFKM to AMS7257 (70 to 80 Shore A); silicone to AMS7267 and AMS3304; and nitrile to MIL-PRF-25732 for the MS28775 family (now AS28775). DLA ASSIST lists MIL-PRF-25732 as inactive, at revision E of 2024-03-08 (read 2026-09-24). M25988 fluorosilicone rings are ordered to the MIL-DTL-25988 slash sheets (/1 to /4, Active); DoD's 2025 notice marks the base document inactive for new design and in part superseded by SAE AMS-R-25988 (DLA ASSIST, read 2026-09-24 and 2026-09-28). Qualification belongs to the manufacturer that made the compound, and the manufacturer's certificate ships with every specification part.
How is compression set specified?
By a named test and its conditions. ASTM D395 is the test: it measures how well a rubber compound keeps its elastic properties after long compression, and it applies particularly to the rubber in seals (ASTM D395-18, scope in the ASTM store listing, read 2026-09-27). The print, or the additional requirements of its ASTM D2000 callout, sets the time and the temperature. The datasheet then reports the percent set, and a lower number means the compound keeps more of its sealing force after long service.
Related guides
Setting Conquest Seal up as a supplier?
Send the compound or specification and the quantity
We quote the compound or specification your print calls out and send the maker's data sheet with the quote. A Conquest representative replies. Quotes answered within one business day. A person answers (714) 632-9830, Pacific business hours.
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