Rubber & Silicone Material Specification Library

This library summarizes the working properties of the elastomers Anlintech molds most often. Use it to shortlist candidates, then confirm against your exact service environment. Hardness, temperature ceiling, and compliance notes follow industry-standard ranges; specific grades and certifications are confirmed at quotation. Companion references: FKM temperature limits and the AS568 size chart.

Elastomer Property Overview

Material	Service Temp (°C)	Shore A	Key Strengths	Typical Compliance
FKM (Viton®)	-20 to +205	70–90	Chemical, fuel, heat, compression set	AMS 7276, FDA grades
FFKM	-20 to +320	70–90	Near-universal chemical resistance, extreme heat	Limited FDA options
NBR (Buna-N)	-40 to +120	40–90	Oil, fuel, low cost	General industrial
HNBR	-40 to +150	50–90	Oil + heat + abrasion, sour-gas (NACE)	API 6A, NACE MR0175
EPDM	-50 to +150	40–90	Weather, ozone, steam, brake fluid	General / automotive
Silicone (VMQ)	-60 to +230	30–80	Wide temp, food/medical, flexibility	FDA, USP Class VI
Fluorosilicone (FVMQ)	-60 to +200	40–80	Silicone temp + fuel resistance	FDA options
Neoprene (CR)	-40 to +120	40–80	Weather, flame, moderate oil	General industrial
Polyurethane (AU/EU)	-40 to +80	70–95	Abrasion, tear, load bearing	Not for hot water/acid

Chemical Resistance Quick Guide

Ratings: G = good, F = fair, P = poor. Confirm with fluid concentration and temperature at quotation.

Material	Oil / Grease	Fuel	Ozone / Weather	Steam / Hot Water	Acid / Base
FKM (Viton®)	G	G	G	G	G
FFKM	G	G	G	G	G
NBR (Buna-N)	G	G	P	F	F
HNBR	G	G	F	F	F
EPDM	P	P	G	G	G
Silicone (VMQ)	F	F	G	G	F
Neoprene (CR)	F	F	G	F	F

Hardness and Durometer

Elastomer hardness is measured in Shore A. Lower values (30–50) give better sealing at low clamp force and on irregular surfaces; higher values (80–95) resist extrusion, abrasion, and high pressure. We hold tolerances to ISO 3302-1 and can dial hardness to your groove design.

Standards and Tolerances

Dimensions: ISO 3302-1 (molded rubber), ISO 3601 / AS568 (O-rings).
Aerospace: SAE AMS specifications (e.g., AMS 7276 FKM, AMS 7259 silicone).
Oil & gas: NACE MR0175 / ISO 15156, API 6A for sour-service elastomers.
Food / medical: FDA 21 CFR, USP Class VI, 3-A where applicable.

For a specific material data sheet or a compound recommendation, contact the Anlintech engineering team. See also our rubber parts FAQ.