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Re: KillieTalk Digest V3 #1690
In a message dated 11/2/2001 2:30:11 PM Central Standard Time,
Owner-KillieTalk at AKA_Org writes:
> In the case of many injection
> molded plastics the molds are oiled before the plastic is injected.
> Detergent removes the oil and is less toxic that many other solvents I can
> think of.
>
Oils are seldom used in injection molding anymore, and the few instances
where "oils" are used, I would be hard pressed to believe that they are as
injurious to fish as is the detergent. Most common mold releases used, if
any, are Teflon telomars (short chain Teflon) or silicone, but either is a
costly labor step, requiring a stop in the injection molding process. Highly
polished molds with proper knockout pin placement, instead of mold release,
is the usual production scenario.
That said: It is a fact that three washings of an item with a minimum of 100
parts solvent (rinse water in this case) to 1 part residual (the amount of
detergent/water left on the part being washed) will lower the contaminant to
below 1 part per million. That says there is no real fear to using
detergent, or any other substance - IF - you are careful with your rinse
step, and complete at least three rinses with sufficient clean water.
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