#660 Latex is the prevulcanized form of #80. It was designed specifically for short run polyester work. When polyester resins are cast into natural Latex, a tackiness develops on the surface of the rubber and/or polyester cast. This is due to free sulfur not combining with the mold. The problem can be solved by using a prevulcanized Latex such as #660. Prevulcanized molding compounds contain no free sulfur on the surface and can therefore be used for short run polyester resin casting. Avoids the necessity of an aluminum or plaster separator during the curing process.

CATEGORY -Latex # 660 is a formulation compounded from a specially prepared high solids content natural latex.

VULCANIZATION -No post cure is necessary since the #660 is prevulcanized.

ODOR -Latex # 660 is compounded with ammonia. It has a distinct ammonia odor. Ammonia is one of the most common preservatives used in Latex when it is shipped from the plantation.

CHARACTERISTICS -High Latex stability. Long storage life. Vulcanized molds have excellent resistance to tearing. Excellent resistance to sunlight and aging. Uniform batches made under strict quality control.

STORAGE -Latex # 660 has a shelf life of approximately one year if kept in a cool place. The Latex will turn into a cottage cheese consistency when it is spoiled or will develop a putrid odor.

USE -Plaster: #660 Latex has been for plaster because it has great resistance to the heat that is generated and maintains excellent detail. The inherent characteristics of this Latex are such that no release agent is needed when casting plaster.

Concrete: Latex #660 has also been used by those who pour concrete.

Wax: Latex #660 has good resistance to the heat generated by wax. Although it cannot be used for exceptionally long runs, short and medium size runs work out very well.

Polyester Resins: Latex #660 can be used when pouring polyester Resins, but only with limited success.

STORING THE MOLD-Store in a cool, dark place. Avoid direct sunlight.