Efalon® Carbon-filled K-25

Identification & Functionality

Chemical Family

Fluoropolymers

Fillers Included

Carbon Fiber

Polymer Name

Polytetrafluoroethylene (PTFE)

Reinforcement Material

Carbon Fibers

Technologies

Composite Materials,

Plastics

Product Families

Composite Materials — Parts & Shapes

Plastics — Parts, Shapes & Films

Features & Benefits

Materials Features

Corrosion Resistant,

Excellent Mechanical Strength,

Low Deformation Tendency,

Low Thermal Expansion,

Thermally Insulating,

Wear Resistant

Key Benefits

• Very good resistance to deformation under load 
• Very high wear resistance in dry and greasy environments 
• Resistant in corrosive environments
• Ideal for hydrated environments 
• High heat insulation

Applications & Uses

Markets

Industrial

Applications

Industrial — Chemical & Industrial Manufacturing

Equipment & Parts,

Other Industrial Applications

Plastics & Elastomers End Uses

Bearings,

Gaskets,

Piston Rings

Properties

Physical Form

Rods,

Sheets,

Tube

Mechanical Properties

	Value	Units	Test Method / Conditions
Tensile Strength at Break	110 - 210	Kg/cm²	D638
Compressive Stress (%1 Deformation, 23°C)	85 - 110	Kg/cm²	D695
Total Deformation	2.9 - 4.8	%	D621
Permanent Deformation	0.4 - 2.1	%	D621
Elongation at Break (23°C)	70 - 110	%	D638
Impact Resistance (Izod, Notched)	8.5 - 9	Kj/m²	D256
Hardness	65 - 68	Shore D	D2240
Total Deformation Under Weight (10 kg/cm² Load, 150°C, 24 hours)	1.8 - 2	%	-
Total Deformation Under Weight (50 kg/cm² Load, 150°C, 24 hours)	8 - 9	%	-

Physical Properties

	Value	Units	Test Method / Conditions
Coefficient of Friction (Static)	0.11	-	-
Coefficient of Friction (Dynamic)	0.12	-	-
PV Limits (3 m/min)	220 - 230	kg.cm³.min	-
PV Limits (30 m/min)	250 - 400	kg.cm³.min	-
PV Limits (300 m/min)	300 - 450	kg.cm³.min	-

Typical Properties

	Value	Units	Test Method / Conditions
Density (23°C)	2.05 - 2.15	g/cm³	D792

Thermal Properties

	Value	Units	Test Method / Conditions
Coefficient of Linear Thermal Expansion (25°C-100°C, [x10^-5])	9.5 -10	°C-1	D696
Coefficient of Linear Thermal Expansion (25°C-100°C, [x10^-5])	11 - 12	°C-1	D696
Coefficient of Linear Thermal Expansion (25°C-100°C, [x10^-5])	13 - 15	°C-1	D696
Heat Conductivity (30°C, [x10^-4])	15 - 17	Cal/cm.sn.°C	-
Maximum Allowable Service Temperature in Air - Continuous	270	°C	-
Maximum Allowable Service Temperature in Air - Continuous	-260	°C	-

Electrical Properties

	Value	Units	Test Method / Conditions
Surface Resistivity (23°C, RH 50%)	min. 10^7	Ohm	D257
Surface Resistivity (23°C, 50% RH)	min. 10^7	Ohm	D257
Volume Resistivity (23°C)	min. 10^3	Ohm-cm	D257