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Reply by SteveRussell

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SteveRussell

101 posts in 5198 days


#1 posted 10-26-2007 02:59 AM

Hello Charles,

I use General Salad Bowl Finish all the time… It contains the following:

C.A.S.#

8052-41-3 Mineral spirits 20-40%
64742-47-8 Mineral spirits 10-20%
64742-48-9 Mineral spirits 5-10%
111-84-2 Nonane 5-10%
Proprietary Oil modified urethane resin 10-35%
Proprietary Resin 0-25%
95-63-6 1,2,4-Trimethylbenzene 0-1%

You’re right that modern driers do not contain lead anymore… (Driers are oil soluble metal salts of organic acids. When these driers are dissolved in aliphatic or aromatic hydrocarbons, they are known as siccatives. When driers are added to drying oils, they are known as Boiled Oils).

Traditionally, driers contained combinations of oil-soluble metal salts like Cobalt and/or Manganese with Zirconium, Lead or Calcium salts of 2-ethylhexanoic acid or naphtenic acids. Cobalt and Manganese salts act as surface driers and aid in the drying of the film on the surface, where oxygen concentrations are the highest.

Lead and Zirconium salts catalyze throughout the film and are known as through driers. To avoid the use of Lead, which is highly toxic, modern siccatives employ blends of Cobalt and Zirconium. This combination reduces surface drying speed, promoting even drying throughout the substrate. Calcium salts are sometimes used as well, mainly to reduce the amounts of other driers that may be needed. Various other compounds may also be present in some siccatives including Beryllium, Cadmium and Nickel. Take care and all the best to you and yours!

Steve Russell
EWW, WVP, EWWFS
The Woodlands, Texas

-- Better Woodturning and Finishing Through Chemistry... http://www.woodturningvideosplus.com


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