BS 7897-3:1997
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Specification for lac and shellac Bleached lac
Hardcopy , PDF
16-05-2017
English
15-08-1997
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Committees responsible
National foreword
Specification
0 Introduction
1 Scope and field of application
2 Definitions
3 Form
4 Conditions and types
5 Volatile matter (moisture)
6 Matter insoluble in hot alcohol
7 Colour
8 Wax
9 Ash
10 Rosin and copals
11 Matter soluble in water
12 Chlorine content
13 Acidic value and mineral acid
14 Free chlorine or peroxides
15 Arsenic
16 Lead
17 Requirements
18 Tests
19 Sampling
Annexes
A Determination of volatile matter (moisture) content
B Determination of matter insoluble in hot alcohol
C Comparison of colour
D Determination of wax
E Determination of ash
F Detection of rosin (Halpen-Hicks method)
G Detection of copals
H Determination of matter soluble in water
J Determination of chlorine
K Determination of acid value
L Determination of mineral acid
M Test for free chlorine or peroxides
N Determination of arsenic
P Determination of lead
Q Sampling
Tables
1 Requirements for bleached lac
2 Sieve designations and mesh apertures corresponding
to specified sizes
Figures
1 Extraction apparatus for determining matter insoluble
in hot alcohol - Method 1
2 Hot water bath for insoluble matter test - Method 1
3 Siphon tube and adaptor
4 Folding of filter paper
Gives requirements for two grades differing in matter insoluble in hot alcohol, matter soluble in water, ash and wax content. Definitions, colour, copals, rosin, free chlorine content, arsenic and lead content tests are all specified.
| Committee |
STI/10
|
| DevelopmentNote |
Reviewed and confirmed by BSI, May, 2005. (04/2005) Also numbered as ISO 57 Supersedes 95/120413 DC and BS 1284(1960) (10/2005)
|
| DocumentType |
Standard
|
| Pages |
36
|
| PublisherName |
British Standards Institution
|
| Status |
Withdrawn
|
| Supersedes |
| ISO 565:1990 | Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes of openings |
| NFX 11 504 : 1992 | METAL WIRE CLOTH AND PERFORATED PLATE FOR TEST SIEVES - TECHNICAL REQUIREMENTS AND VERIFICATIONS |
| DIN 4188-1:1977-10 | SCREENING SURFACES, WIRE SCREENS FOR TEST SIEVES, DIMENSIONS |
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