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The majority of Ba-Zn stabiliser systems are liquid mixed
metal soaps which have similarities to some Ca-Zn stabilisers
and are generally in the form of a carboxylate. As in the
case of Ca-Zn heat stabilisers, all of these products require
the addition of co-stabilisers to provide optimum performance.
These are the same type of products as are used with Ca-Zn
stabilisers. Solvents are sometimes incorporated. These
stabilisers have successfully replaced Cadmium based stabilisers
in many applications.
The stabilisers are formulated to suit specific requirements
such as clarity, good initial colour, long-term stability
and compatibility with filled, pigmented systems. Some products
achieve a good compromise of all the necessary requirements
while others are designed to meet only one or two.
A group of specialised liquid soaps allied to Ba-Zn soaps
are Zinc or Potassium-Zinc soaps. These are generally laurates
or octoates and are used as PVC stabilisers and as activators
(or "kickers") for the blowing agent used in making
the foamed layer in a number of plastisol applications.
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