Vipro Tools & Engineers

Sr. No.	Property	Unit	Test Method	Virgin PTFE		15% Glass Filled PTFE		25% Glass Filled PTFE		25% Carbon Filled PTFE		15% Graphite Filled PTFE		40% Bronze Filled PTFE		60% Bronze Filled PTFE		55% Bronze +5% MoS₂
1.	Density	gm/cc	ASTM D-792	2.1-2.2		2.23-2.24		2.24-2.25		2.12-2.14		2.14-2.16		3.1-3.2		3.75-3.8		3.8-3.9
2.	Tensile Strength	kgf/cm²	ASTM D-638	210-350		150-225		125-200		120-155		150-200		125-150		105-140		110-145
3.	Elongation of break	%	ASTM D-638	250-400		225-325		200-300		100-150		175-225		100-175		80-160		90-165
4.	Compressive Strength	kgf/cm²	ASTM D-695	40-50		65-75		75-85		75-85		65-75		85-100		115-125		115-125
5.	Compressive Modulus	kgf/cm²	ASTM D-695	4000		6000		7000		8400		8000		8500		8800		8800
6.	Deformation A. 2 Hrs. 23^oC 113 kg/cm² B. 24 Hrs. 23^oC 113 kg/cm² C. Permanent D. 2 Hrs. 150^oC 113 kg/cm²	%	ASTM D-621
				12		10		9		5		6		5		4		4
				15		12		11		7		8		6		5		5
				8		7.5		7		3.5		4.5		3		2.5		2.5
				55		52		50		35		43		42		40		40
7.	Flexural Strength	kgf/cm²	ASTM D-790	57		50		42		96		60		85		80		80
8.	Flexural Modulus	kgf/cm²	ASTM D-790	3500-6300		20000		16700		11900		11000		14000		13800		13500
9.	Impact strength	cmkgf/cm²	ASTM D-256
	A. -20^oC			9		9.25		9.5		8		10		11		11		11
	B. +20^oC			15		12-5		11		10		14		9		10		10
10.	Hardness	Shore D	ASTM D-2240	60-65		65-70		70-75		70-75		60-65		70-75		70-75		70-75
11.	Coefficient of Friction
	A. Dynamic P-7 kg/cm² V-0.5 m/s		___	0.04-0.06		0.31-0.37		0.5-0.54		0.12-0.17		0.11-0.16		0.11-0.15		0.12-0.16		0.01-0.14
	B. Static P-35 kg/cm²			0.05-0.08		0.1-0.12		0.11-0.13		0.09-0.11		0.08-0.10		0.08-0.1		0.08-0.1		0.07-0.09
12.	Water Absorption	%	ASTM D-570	0		0.015		0.013		0		0		0		0		0
13.	Heat Resistance at Atm. Pressure	⁰C	___	-250 to +260		-250 to +260		-250 to +260		-250 to +260		-250 to +260		-250 to +260		-250 to +260		-250 to +260
14	Thermal Conductivity	10^-4 cal cm S^oC	cenco Fitch	6		8		9		13		14		17		19		19
15.	Liner Thermal Expansion	%	ASTM D-696	Axial	Radial	Axial	Radial	Axial	Radial	Axial	Radial	Axial	Radial	Axial	Radial	Axial	Radial	Axial	Radial
	A. 30-150^oC			1.5	1.5	1.5	1.0	1.5	0.7	1.2	1.0	1.3	1.0	1.15	0.95	1.1	0.9	1.1	0.9
	B. 30-200^oC			2.4	2.3	2.3	1.8	2.2	1.0	1.9	1.5	2.0	1.7	1.85	1.55	1.8	1.5	1.8	1.5
	C. 30-250^oC			3.4	3.6	3.3	2.2	3.2	1.4	2.7	2.4	3.0	2.5	2.55	2.25	2.5	2.2	2.5	2.2
16.	Dielectric Strength	Kv/mm	ASTM D-149	24		16		12		2		2		Conductive		Conductive		Conductive
17.	volume Resistivity	ohm cm	ASTM D-257	10¹⁸		10¹⁵		10¹⁵		10⁴		10³		10⁷		10⁷		10⁷
18.	Surface Resistivity	ohm	ASTM D-258	10¹⁵		10¹⁵		10¹⁵		10⁷		10⁶		10⁹		10⁹		10¹⁰
19.	Chemical Resistance : PTFE is chemically inert & unaffected by all known chemicals except molten or dissolved alkali metals - Sodium; Potassium; Rubidium; Cesium; Francium & Fluorine gas, certain fluorine compounds & complexes at elevated temperatures. Filled PTFE has inferior chemical resistance depending upon the particular filler.
*	Data quoted are average values & should not be used as specifications for designing specifc applications.