BS 3921:1985

Foreword
Committees responsible
Specification
0. Introduction
1. Scope
2. Definitions
3. Sizes
4. Dimensional deviations
5. Durability
6. Efflorescence
7. Compressive strength
8. Water absorption
9. Sampling
10. Marking
Appendices
A. Measurement of dimensions
B. Determination of soluble salt content
C. Deleted
D. Determination of compressive strength
E. Determination of water absorption
F. Appearance
G. Check-list for ordering bricks
H. Determination of initial rate of suction
J. Recommendations for quality control
Tables
1. Sizes
2. Limits of size
3. Durability of bricks by compressive strength and
    water absorption
4. Classification of bricks by compressive strength
    and water absorption
5. Number of bricks required for testing
6. Limits for the dimensions measured when using the
    gauge board
Figures
1. Arrangement of bricks for the measurement of
    
2. Deleted
3. Example of control charts for the quality control
    scheme for compressive strength

Requirements for dimensions, compressive strength, water absorption, soluble salt content, efflorescence and sampling for bricks manufactured from clay for use in walling. Also gives methods of classification and guidance on appearance. Sizes and tolerances apply only to the 225 mm x 112 .5 mm x 75 mm format. See also BS 6649 and BS 4729.