TS 5574

TS 5574 is a standard for varnished fabrics used in electrical engineering, focusing on their definitions, naming, and the general rules associated with this material family. It helps identify the place of woven fabric substrates treated with varnish or similar binders within electrical insulating materials and provides a common terminology for products supplied in different forms.

The standard covers varnished fabrics made from cotton, silk, or synthetic fibres, including glass fibre, on a woven base. It also recognises that these products may be supplied as full-width rolls, sheets, or tapes slit to various widths, which is an important distinction in electrical applications. In general technical terms, varnished fabrics are used where a combination of electrical insulation, mechanical support, and surface protection is needed in winding and insulating assemblies.

Why the terms and supply forms matter

A varnished fabric is more than a textile base: its varnish treatment is what gives it relevance in electrical applications. The fibre type, woven construction, and final supply form all influence how the material is described and used. By standardising these designations, the document reduces ambiguity between commercial descriptions and technical terminology, especially when the same material is delivered in different widths or formats.

What this standard provides

• Terminology and general definitions for varnished fabrics used in electrical purposes
• A common framework covering cotton, silk, synthetic fibres, and glass fibre bases
• Recognition of full-width rolls, sheets, and slit tapes as supply formats
• A harmonised naming basis for related electrical applications