A compreg is a compressed wood laminate made by impregnating wood veneers with synthetic resin (like phenol-formaldehyde) and consolidating them under heat and high pressure.

What are the primary applications of Part 1 compregs?

They are used for electrical insulation components, structural supports, and cleats in heavy electrical equipment like transformers and switchgears.

Why is moisture content strictly limited in this specification?

High moisture content increases electrical conductivity, significantly reducing the dielectric strength and insulation resistance of the laminate.

IS 3513

: 2000

Resin-treated compressed wood laminates (compregs) - Specification, Part 1: For electrical purposes

CurrentSpecializedSpecificationMaterials Science · Wood and Other Lignocellulosic Products

Download PDF BIS Portal Google

This standard prescribes the requirements and methods of test for resin-treated compressed wood laminates (compregs) intended specifically for use as electrical insulation. It covers critical physical, mechanical, and dielectric properties required for reliable performance in electrical equipment such as transformers and switchgears.

Resin-treated compressed wood laminates (compregs) - Specification, Part 1: For electrical purposes

Quick Reference Values

Minimum Density1.22 g/cm³

Maximum Moisture Content4.0 %

Maximum Water Absorption (24 hrs)2.0 %

Practical Notes

Ensure compregs are stored in a dry, well-ventilated environment, as moisture absorption severely degrades their dielectric strength.

Because of the high density and synthetic resin impregnation, machining these laminates requires carbide-tipped or diamond-tipped tools to prevent rapid tool wear.

Prior to use in high-voltage applications, vacuum drying and oil-impregnation are often recommended to maximize insulation resistance.