BS 419:1966

This standard BS 419:1966 Specification for varnished fabrics and tapes for electrical purposes is classified in these ICS categories:

• 29.035.60 Varnished fabrics

This British Standard covers fabrics woven from cotton, silk, nylon polyethylene-terephthalate (PTP)⁵⁾ and glass, coated on both sides with varnish, and of nominal thickness from 4 mil (0.10 mm) to 10 mil (0.25 mm) supplied in the full width of approximately 36 inches (915 mm) or slit into tape. Although the types of varnished fabric are described throughout this standard as “yellow” and “black”, any varnish having the appropriate properties but differing in colour may be used, by agreement between the purchaser and the supplier.

⁵⁾ See BS 3502, “List of common names and abbreviations for plastics”.

Fabrics woven from cotton, silk, nylon, polyethylene terephthalate (PTP) and glass, coated with varnish, in full width of 36 in approx. or slit into tape. Yellow and black in nominal thicknesses 4 mil (0.10 mm) to 10 mil (0.25 mm). Thickness, width, length, joins, packaging, electric proof strength at 20°C and at 90°C, tensile strength, tearing strength, decrease in tearing strength with heat ageing in air, acidity, varnish stability, extensibility, confirmation of glass fabric base; test methods in appendices.