Antistatic PP masterbatch remains highly effective at very low atmospheric humidity

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  • Significant reduction of electrical surface resistance
  • Very good long term antistatic effect
  • Application: PP packaging used in the electronics industry to foodstuff

ST7505HP is a newly developed antistatic masterbatch from Tosaf, which is optimised for polypropylene (PP) and remains highly effective even at very low atmospheric humidity.

Significant reduction of electrical surface resistance

Low amounts of just 1% to 5% for extrusion and 3% to 5% for injection moulding lead to 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 colour and transparency of the material and meets FDA and EU requirements for food contact.

Very good long term antistatic effect

In laboratory testing, ST7505HP has demonstrated its very good antistatic effect which is retained over the long term even at just 12% RH (see graph), whereas conventional additives of this kind, such as hydrophilic surfactants, require a significantly higher atmospheric humidity in order to be effective. Tosaf’s new antistatic additive thus 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.

PP masterbatch performance chart

Even small quantities of 5% and below of Tosaf’s new masterbatch ST7505HP provide an “excellent” antistatic effect* (decay time < 1 sec) in very dry air, still remaining “good” (decay time < 10 sec) after 3 months and beyond. *static decay meter according to NFPA 99 – 10% cutoff, 90% dissipation, from 5 kV to 0.5 kV.

Application: PP packaging used in the electronics industry to foodstuff

ST7505HP is particularly suitable for PP packagings used in the electronics industry because it does not show a corrosive effect on the polycarbonate (PC) which is frequently used in this sector and thus does not 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 explains, “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 polyolefins and their applications as packaging materials, for example for foodstuffs, personal care, electrical and electronic products.”

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