Conformity Assessment According to DIN EN ISO 9539

Resistance to solvents for non-metallic materials in contact with fuel gases must be demonstrated with defined immersion and re-drying tests in acetone vapor, dimethyllformamide vapor and n-pentane. The challenge for sealing materials is that the first two substances require a nonpolar material (EPDM) or a weakly polar material (CR) because of their strong polarity, while n-pentane requires a polar material (NBR, HNBR or FKM). In addition to an FFKM material, a CR elastomer has the best chance of meeting the resistance criteria for all three materials.