Electrical Grade Polyamide/imide Film

Torlon® 4203L Polyamide/Imide films are a high-performance thermoplastic film material. With 14 variations available, they provide an optimal balance of mechanical, thermal and chemical resistance properties for demanding applications. Example uses include aerospace components, bearings, bushings, and electrical insulators where durability at high temperatures is critical.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Foil/Film/Sheet

Thickness		±20%

Material Properties for Polymers

Chemical Resistance

Element	Value
Acids - concentrated	Fair-Poor
Acids - dilute	Fair
Alcohols	Good-Poor
Alkalis	Poor
Aromatic hydrocarbons	Good
Greases and Oils	Good
Halogenated Hydrocarbons	Good-Poor
Halogens	Good-Poor
Ketones	Good

Electrical Properties

Element	Value
Dielectric constant @1MHz	3.9-5.4
Dissipation factor @ 1MHz	0.03-0.042
Dielectric strength( kV mm⁻¹ )	23at 1mm
Surface resistivity( Ohm/sq )	8-50 x 10¹⁷
Volume resistivity( Ohmcm )	0.08-2 x 10¹⁷

Physical Properties

Element	Value
Flammability	V0
Radiation resistance	Good
Resistance to Ultra-violet	Good
Limiting oxygen index( % )	44-45
Water absorption - equilibrium( % )	03-Apr
Water absorption - over 24 hours( % )	0.3
Density( gcm⁻³ )	1.42-1.46

Mechanical Properties

Element	Value
Hardness - Rockwell	E72-86
Poisson's ratio	0.38
Elongation at break( % )	Jul-15
Tensile modulus( GPa )	4.5-6.8
Izod impact strength( J m⁻¹ )	60-140- notched
Tensile strength( MPa )	110-190

Thermal Properties

Element	Value
Heat-deflection temperature - 1.8MPa( C )	278-9
Lower working temperature( C )	-200
Upper working temperature( C )	200-260
Specific heat( J K⁻¹ kg⁻¹ )	1000
Thermal conductivity( W m⁻¹ K⁻¹ )	0.26-0.54@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	25-31