BS 7290-2(1990) : 1990 AMD 10106

Committees responsible
National foreword
Specification
1. General
2. Designation
3. General requirements
4. Dimensions
5. Properties
6. Roll characteristics for all types
Tables
1. Nominal thickness and permitted range of thickness
2. Property requirements for all types
3. Property values for all types
4. Electric strength (a.c. test) for all types
5. Maximum permissible number of joins per roll
6. UntitledCommittees responsible
National foreword
Methods
     Introduction
1. Scope
2. General notes on tests
3. Thickness
4. Density
5. Width
6. Windability (bias/camber and sag)
7. Surface roughness
8. Coefficient of friction
9. Wetting tension (polyolefine films)
10. Tensile properties
11. Edge tearing resistance
12. Tear resistance
13. Stiffness of film
14. Surface resistivity
15. Volume resistivity
16. Dissipation factor and permittivity
17. Dissipation factor under impregnated conditions
18. Electric strength
19. Electrical weak spots
20. Resistance to breakdown by surface discharges
21. Electrolytic corrosion
22. Melting point
23. Dimensional change
24. Dimensional stability under tension with rising
     temperature
25. Dimensional stability under pressure with rising
     temperature
26. Resistance to penetration at elevated temperature
27. Volatile content (loss of mass on heating)
28. Thermal endurance
29. Burning characteristics
30. Water absorption in a damp atmosphere
31. Absorption of liquid
32. Ionic impurities
33. Effect of insulating varnishes
34. Effect of polymerisable resinous compounds in a
     liquid state

Applicable to plastic films used for electrical purposes. Gives methods of test. Coverage includes general notes on tests, thickness, density, width, windability, surface roughness, coefficient of friction, wetting tension, tensile properties, edge tearing resistance, tear resistance, stiffness of film, surface resistivity, volume resistivity, dissipation factor and permittivity, dissipation factor under impregnated conditions, electric strength, electrical weak spots, resistance to breakdown by surface discharges, electrolytic corrosion, melting point, dimensional change, dimensional stability under tension with rising temperature and under pressure with rising temperature, resistance to penetration at elevated temperature, volatile content, thermal endurance and burning characteristics.