Recommended specification for composite thinner for thinning semipaste paints when the use of straight linseed oil is not justified
- Publisher
- Elsevier Science
- Year
- 1921
- Tongue
- English
- Weight
- 97 KB
- Volume
- 191
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
The Committee's draft was submitted to representatives of the paint and varnish industries and careful consideration given to their suggestions.
The specifcation gives the general requirements as to performance, leaving the question of specific composition an open one so as to permit a wide range of sources for the material. The provisions also include statements as to the methods of sampling, laboratory examination, and preparation of reagents.
This specification covers a composite thinner which contains in one liquid drying oil, drier, and volatile thinner. The con> posite thinner nmst meet the following requirements:
Appearance.--Shall he clear and free from suspended matter and sediment.
Color.--No darker than a solution of 6 g. of potassium dichromate in mo c.c. pure sulphuric acid of specific gravity ~.84.
Odor.--Not offensive, either in bulk or in its subsequent use in paint mixtures.
Mixing with Linseed Oil.--When mixed in any proportion with pure raw linseed oil meeting the specifications of B. S. Circular 82, the resulting mixture shall be clear and shall show no separation or precipitation on standing ~8 hours.
Drying.--When flowed on glass, the composite thinner shall set to touch in not more than 4 hours and dry hard in not more than 6 hours. When mixed with an equal volume of pure raw linseed oil, the resulting mixture when flowed on glass shall set to touch in not more than 6 hours and dry hard in not more than 8 hours.
o Circular "No. io2.