Permeation Resistance
Regulations are getting tougher – not only must automobiles not pollute via the exhaust, they must not allow fuel vapors to permeate through seals and gaskets. Through seal permeation resistance is and will be an important consideration going forward. Precix®’s F86 GF-based High-Fluorine Fluorocarbon offers the best permeation resistance in the industry today.
F86 Relative Permeation of Elastomers
| Material | Permeation Units* | SAE J200/ASTM D2000 Designation |
| F86 (GF® Based Type) | 3 | 3HK715A1-10B37B38C12EF31EO78Z 1Z2 Z1 = DURO 75 +/-5 Z2 = COLOR GREEN |
| GFLT® Type FKM | 14 | |
| Fluorocarbon (FKM) | 36 | |
| FKM /FVMQ Blend | 275 | |
| Fluorosilicone (FVMQ) | 635 | |
| HNBR | 1000 |
* Lower permeation value is better
Relative Permeation test ASTM D814:
Gasoline/Methanol (85/15%) @ Room Temperature
Permeation units = (grams * mm)*(M2 * 24hrs) where:
¨ (grams * mm) = grams going through an mm test slab
¨ (M2 * 24hrs) = square meters for a day
“# of grams through an ‘X’ thick slab measured in a square meter for one day”