BS 1041-7:1988

Foreword
Committees responsible
Guide
Section one. General
1 Scope
2 Definitions
Section two. Indicators that change shape or size
3 General
4 Pyrometric cones
5 Thermoscope bars
6 Bullers rings
Section three. Colour-change indicators
7 General
8 Temperature indicating paints
9 Reversible colour-change indicators and paints
10 Temperature indicating labels
Tables
1 Approximate touch-down temperatures of pyrometric
    cones
2 Approximate bending temperatures of thermoscope bars
3 Approximate temperature chart for Bullers rings
4 Examples of single-change paints
5 Examples of multi-change paints
Figures
1 Form of pyrometric cones
2 Thermoscope bars on stand before and after firing
3 Bullers ring and gauge
4 Examples of trigger temperature-time relationships
    for some single-change paints
5 Examples of trigger temperature-time relationships
    for a multi-change paint

Guidance on \'change of state\' devices used to indicate the amount of heat work which the subject being considered has undergone. Two groups of devices are included, those which change shape or size and those which change colour.

This Part of BS 1041 provides guidance on “change of state?? devices used to indicate the amount of heat work which the subject being considered has undergone. The two groups of change of state devices which are included are those which change shape or size and those which change colour.

Included in the former are the following:

1. pyrometric cones;
2. thermoscope bars;
3. Bullers rings.

Of the preceding, a) and b) change their shape during heating and c) change size.

The change of colour devices are:

1. temperature indicating paints;
2. reversible colour change indicators and paints;
3. temperature indicating labels.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.