Additives for Polymers July 1994

and can be used with any colour. Contact: Wilson Color SA, 2 rue Melville Wilson, B-5330 Assesse, Belgium. Tel: +32- 83-660251. Fax: +32-83-660363.

Glass reinforcements range from Owens-Corning

Owens-Corning produces glass reinforcements in a variety of different types and packages. Continuous rovings are bundled, twine-like strands supplied as cylindrical packages. No cores are used to reduce waste and provide smooth transfer of roving for continuous processing. For some moulding processes, the rovings are chopped to specified lengths and combined with resin to provide isotropic strength properties within the finished part. For other processes, the roving is used continuously within the resin for exceptional strength in the fibre’s longitudinal direction.

Reinforcing fibres are also supplied as roll goods engineered for specific process and end-product needs. Roll goods are supplied in various densities, or weights per square unit. Rolls of mat are made with randomly- dispersed chopped fibres or continuous fibre strands that are laid down in a swirl patter. In either case, fibres are held together with a resin-compatible binder. Woven roving is a heavy, drapable roll good that it woven from continuous rovings.

Owens-Corning also makes Bi-Ply combination product that offers woven roving and chopped strand mat as a single, time- and resin-saving roll good.

The company makes chopped strands and milled fibres that are combined with resins, fillers and additives to produce moulding compounds. “Long fiber ” compounds are made by impregnating continuous fibres with resin and chopping the resulting product to lengths greater than one inch, or 25 millimeters. Fiberglas reinforcements are also used to make intermediate forms, such as

“preforms” of fibres held together with a binder and “prepregs” or resin-impregnated fibre. These preliminary forms facilitate the moulding process and/or improve the end- product. Contact; Owens-Corning, Fiberglas Tower, Toledo, OH 43459, USA. Tel: +1-419-248- 8ooO.

Revert6 fillers to be marketed in the UK

Microfine Minerals Ltd, the UK manufacturer of high performance functional fillers, has concluded an agreement with SA Revert6 of Spain to supply its products to the UK and Irish markets.

The Revert6 range of high-brightness, ultratine natural calcium carbonates is produced in the Tarragona region of Spain. Manufactured from some of the world’s whitest calcite and marble deposits, Revert6 products are said to be highly effective in formulations across a wide spectrum of industries. Revert6 products include Microcarb 95T, specially developed for PVC window profile. This product, and the larger mean particle size Microcarb 60T, is said to offer an excellent combination of processability, colour and final product performance, all at a competitive price. Contact: Microfine Minerals Ltd, Raynesway, Derby, DE21 7BE, UK. Tel: 673131. Fax: +44-332-677590.

+ 44-332-

Micra1 alumina trihydrate in PVC

Solem Division/JM Huber Corp has recently completed evaluation of its two new grades of Micra1 alumina trihydrate in PVC applications. These products - Micral 1000 and Micra1 1500 - are said to impart excellent physical properties, improved processability and excellent extrusion rates as well as providing flame retardance and smoke suppression.

6 O1994 Elsevier Science Ltd