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Originally, spar varnish was a "long oil" varnish, composed primarily of drying oil with a small proportion of resin, usually boiled linseed oil and rosin. [1] This gave flexibility, [ 2 ] even though its weather resistance was still poor, and thus re-coating was required relatively frequently.
Varnish is a clear transparent hard protective coating or film. It is not to be confused with wood stain . It usually has a yellowish shade due to the manufacturing process and materials used, but it may also be pigmented as desired.
Valspar was the first ever clear varnish; it was developed by L. Valentine Pulsifer, Lawson Valentine's grandson. Pulsifer had joined the company in 1903 after earning a degree in chemistry from Harvard University. After three years of experimentation, he created the clear varnish, which went into production by 1905.
All clear or translucent varnishes, and indeed all film-polymer coatings (i.e., paint, stain, epoxy, synthetic plastic, etc.) are susceptible to this damage in varying degrees. Pigments in paints and stains protect against UV damage, while UV-absorbers are added to polyurethane and other varnishes (in particular " spar " varnish) to work ...
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2: 0.75: 0.045: 0.03: 0.10: 2.0–3.0: Low-carbon grade for handling paper pulp as well as the production of rayon, rubber, textile bleaches, and high-temperature industrial equipment. This is the preferred grade for medical implants as it is resistant to sensitization (grain boundary carbide precipitation). 316F: 16–18: 10–14: 0.08: 2: 1 ...
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