BS 4721:1981

Foreword
Cooperating organizations
Specification
Section one. General
1 Scope
2 References
3 Definitions
4 Testing and sampling
Section two. Ready-mixed lime:sand for mortars
5 General
6 Categorization
7 Materials
8 Sampling of the ready-mixed lime:sand for mortars
9 Available lime content of the ready-mixed lime:sand
    for mortars
10 Physical properties of the ready-mixed lime:sand for
    mortars
11 Manufacturer's certificate
12 Marking
Section three. Ready-to-use retarded mortar
13 General
14 Designation
15 Materials
16 Sampling of the ready-to-use mortar
17 Composition of the ready-to-use mortar
18 Physical properties of the ready-to-use mortar
19 Manufacturer's certificate
20 Marking
Section four. Ready-to-use retarded mortar for screeds
21 General
22 Designation
23 Materials
24 Sampling of the ready-to-use screeding mortar
25 Composition of the ready-to-use screeding mortar
26 Physical properties of the ready-to-use screeding
    mortar
27 Manufacturer's certificate
28 Marking
Appendix
A Notes on the selection and use of ready-mixed
    building mortars
Tables
1 Available lime content of lime:sand mixes
2 Specified properties of the cement gauged mortars
3 Composition of ready-to-use mortars
4 Specified properties of ready-to-use mortars
5 Ready-to-use screeding mortars
6 Specified properties of ready-to-use screeding
    mortars
7 Cement additions required before use; volume
    proportions
8 Cement additions required before use; mass
    proportions
9 Gypsum additions required before use; volume
    proportions
10 Gypsum additions required before use; mass
    proportions

Specifies ready-mixed lime; sand for site prepared mortars and plasters; factory-made ready-to-use retarded mortars for masonry, plastering and rendering; factory-made ready-to-use retarded mortars for screeds. An appendix gives guidance for users of these materials.