FKM Grade Comparison

	General Grades			Specialty Grades
	A	B	F/GF	GB	GFLT	GLT	-30 (Solvay)	-35 (Solvay)	-40 (Solvay)	ETP
Nominal Polymer Fluorine Content, wt%	66	68	70	66	67	64	67	65	65	67
Percent Volume Change in Fuel C 168 hr @ 23°C (73°F)	4	3	2	5	2	5	9	7	9	4
Percent Volume Change in E85 168 hr @ 40°C (104°F)	10	8	6	10	16	10	13	11	9	12
Percent Volume Change in Methanol 168 hr @ 23°C (73°F)	90	40	5	66	5	90	4	26	9	5
Percent Volume Change in KOH 168 hr @ 70°C (158°F)	Samples Degraded									14
Low Temperature Flexibility TR-10, °C	-17	-13	-5	-16	-24	-31	-30	-35	-40	-10
Relative Cost	1.0	1.5	1.5	3.0	4.0	4.0	4.0	5.0	8.5	20.0
Precix Material Code*	F75, F40	F95	F68, F86	F51	F78, F77	F79, F05	F119	F122	F103	F65
	Key to grades:
	GF	Good for fuel
	GB	Also good for fuel
	GFLT	Good fuel, low temp
	GLT	Good low temp
	ETP	Viton Extreme

* Code are examples - other options exist
Viton, GF, GB, GFLT, GLT and ETP are registered trademarks or trademarks of E. I. du Pont de Nemours and Company or its affiliates.