Tosaf's new anti-static masterbatch has been optimised for polypropylene (PP) and remains highly effective even at very low atmospheric humidity.
Low rates of addition of just 1% to 5% for extrusion and 3% to 5% for injection moulding bring about a significant reduction of the high electrical surface resistance, which is typical for products made of PP.
As a result, electrical charges can decay very quickly from moulded parts, rigid packaging or films even in regions with a dry climate or on dry winter days. ST7505HP has no effect on the color and transparency of the material and meets the United States' FDA and European Union requirements for food.
In laboratory testing, ST7505HP has demonstrated a superior antistatic effect which is retained over the long term while conventional additives of this kind, such as hydrophilic surfactants, require a significantly higher atmospheric humidity in order to be effective. Israel-based Tosaf's new anti-static additive ensures that electrical charges, which may attract dust or could damage and even destroy electronic devices, do not build up after extended dry storage or after frictional contact with other surfaces.
ST7505HP is particularly suitable for PP packaging used in the electronics industry because it does not show a corrosive effect on the polycarbonate (PC) which is frequently used in this sector; nor cause stress cracking of the PC boards. In the film processing industry, ST7505HP can enable higher production speeds because film layers can be more easily separated from one another.
Irina Shtein Rozenman from Tosaf's additives R&D division, says: “We had already developed products for polyethylene which similarly retained their effect even at very low humidity. ST7505HP means we can now meet this requirement for the entire range of polyolefin and their applications as packaging materials, for example for foodstuffs, personal care, electrical and electronic products.”
Tosaf Group, founded in 1985, is a joint-venture between Megides Holding and the Ravago Group. The group operates ten factories in Israel, Turkey, Germany, UK, The Netherlands and China. Tosaf's range of products includes mineral-filled compounds and additives such as UV/light stabilisers and flame retardants.