BS 7897-2:1997

Committees responsible
National foreword
Specification
0 Introduction
1 Scope and field of application
2 Definitions
3 Form and condition
4 Types and grades
5 Mandatory requirements
6 Optional requirements
7 Sampling
Annexes
A Determination of matter insoluble in hot alcohol
B Detection of rosin (Halpen-Hicks method)
C Detection of orpiment
D Determination of arsenic content
E Determination of volatile matter (moisture) content
F Determination of colour index
G Determination of wax
H Determination of ash
J Determination of matter soluble in water and test for
    neutrality of aqueous extract
K Flow test
L Heat polymerization test
M Determination of acid value
N Determination of lead content
P Determination of grit content
Q Determination of iodine value
R Test for clarity of solution
S Sampling
Figures
1 Extraction apparatus for determination of matter
    insoluble in hot alcohol (method 1)
2 Hot water bath for determination of matter insoluble
    in hot alcohol (method 1)
3 Siphon tube and adaptor
4 Folding of filter paper
5 Kjeldahl distillation apparatus for use in the
    determination of arsenic content (method 1)
6 Apparatus for the determination of arsenic content
    (method 1)
7 Apparatus for flow test
8 Essential features of the testing fixture F
9 Heat polymerization test apparatus

Specifies four main types of machine-made shellac based on different methods of manufacture. Each type is graded on the basis of colour. Requirements for matter insoluble in hot alcohol are given along with optional requirements for: volatile matter, wax, ash, lead and grit content, matter soluble in water, iodine and acid values, heat polymerisation and flow tests.