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Fighting flame

Electrical equipment is governed by strict regulatory standards that exist to ensure safety. Arnite® polyesters are extensively used for electrical and electronic equipment and the Arnite portfolio covers a wide range of flame-retardant grades, both unreinforced and glass fiber reinforced to meet these demanding standards. Halogen free grades are available also.
Colorful smoke on black background

Arnite is available in grades with UL94 V-0 rating at 1.5mm and 0.75 mm. The ‘S’-grades (V-0 at 1.5 mm) can be used in the majority of applications, whereas the ‘SF’-grades (V-0 at 0.75 mm) are high performance grades that can be used when there are more severe property demands. These grades are UL listed for all color variants, including 50% regrind. They also have very high Comparative Tracking Index (CTI), excellent flow properties, good toughness, and high RTI values.

The limiting oxygen index (LOI) of unmodified Arnite T is 18, while that of unmodified Arnite A is 21.

Detailed listings can be found at

Arnite A properties

Modification with flame-retardants generally leads to a reduction in end-use properties, mostly a deterioration of mechanical, thermal, and electrical properties. In the case of halogen-containing flame retardants, yellowing and blooming are sometimes a problem when a high continuous-use temperature (CUT) or UV stability is required. It is therefore advisable to check as to whether the problems with end-use properties could be resolved by a different part construction or by the application of a less demanding test (e.g., glow wire 960 rating instead of UL-94 V-0 at 1.6 mm), requiring a lower amount of flame retardant.

Arnite T properties

Arnite T is heavily used in electrical and electronic equipment. For these applications strong flammability regulations exist. The limiting oxygen index (LOI) of PBT is 23. In one of its main application areas (electrical and electronics), PBT requires flame-retardant additives in order to be fit for use (e.g. UL94 V-0). Up to now, most flame-retardant systems for PBT have consisted of a mixture of a halogen-containing organic compound as the primary flame retardant and antimony trioxide as a synergist. Proposals for stricter regulations in certain countries, with regard to the possible release of toxic dioxins upon burning in waste incinerators and increased requirements for recyclables have resulted in a growing interest in PBT grades with halogen-free flame-retardants.

Infographic - Flame retardant properties (UL listed major grades) Arnite T

Halogen free flame retardant grades

Arnite is available in a halogen free version: Arnite XG grades.

Unfilled Arnite T Product

  • Arnite T-XG510 which could meet Flammability V2 and 0.75mm
  • GWIT values >=775°C, UL94V classification V2
  • Commercial in White goods connectors application (IEC 60335-1)
  • Limited ductility

Glass Filled Arnite T Product

  • Arnite XG 260 S (30GF) which could meet Flammability V0 and 0.75mm
Infographic - Flame retardant properties of halogen free Arnite T (UL listed major grades)
Infographic - Flame retardant system versus properties

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