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  • BSI
    BS 4145:1967 Specification for glass mica boards for electrical purposes
    Edition: 1967
    $316.70
    / user per year

Description of BS 4145:1967 1967

This British Standard specifies requirements for boards for electrical purposes, made from glass bonded mica powder, from ⅛ in (3.2 mm) up to ½ in (12.7 mm) in thickness.

NOTE Although limits are given only for boards up to ½ in (12.7 mm) thick, boards are made in greater thicknesses up to 1½ in (38.1 mm). For boards over ½ in (12.7 mm) thick, limits and test methods should be agreed between the purchaser and the supplier.

Two types of board are covered, both of which are incombustible.

The boards have good resistance to arcing, good mechanical properties and can be machined provided suitable techniques are employed. The boards are suitable for use as arc shields, terminal boards and high temperature panels.

The density of the boards covered by this standard may be taken as approximately 0.09 lb/in3 (2.5 g/cm3). Density is not, however, a guide to the quality of the board.



Requirements for two types of board for electrical purposes made from glass bonded mica powder, from ⅛ in (3.2 mm) up to ½ in (12.7 mm) in thickness. Definitions, classifications, finish, flatness, thickness, electric strength proof test in oil, surface electric strength proof test in air, insulation resistance, carbon arc test, spirit burner test, water absorption, deformation under compression, shear strength and cross breaking strength. Methods of test given in appendices.

Standard NumberBS 4145:1967
TitleSpecification for glass mica boards for electrical purposes
StatusConfirmed
Publication Date1967-03-31
DescriptorsDeformation, Mica, Compression testing, Electrical insulating materials, Electrical insulation, Insulating boards, Mechanical testing, Thickness, Water-absorption tests, Fire tests, Shear testing, Boards, Specimen preparation, Shear strength, Water absorption, Circuits, Breaking load, Glass, Dielectric strength, Electrical testing, Test equipment, Dielectric-strength tests, Solid electrical insulating materials
ICS29.035.50 Mica based materials
CommitteeGEL/15
ISBN0 580 04117 4
PublisherBSI
Pages22

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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