fire retardant thermal break strip
PA66 GF25 thermal break strip has higher mechanical performance, excellent corrosion resistance nature,and longer life in tough environment. But when we give flame retardant characteristic into the material, the mechanical performance decreasing hardly. KAXITE Technology studied with the subject, tried and test for times, then she came with solutions. Currently, the FR thermal breaks under standard of UL94 V-0 are widely used on curtain wall and facade systems.
KAXITE is a family group business who worked in plastic industry for many years, especially for the polyamide thermal breaks. Regarding kinds of special requirements from clients, KAXITE cuztomizing and satisfying them with her unique technology. Refer to: https://pa.kaxitech.com/m_page/4-Laboratory.html
Below're details for fire retardant UL94:
UL 94, the Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances testing, is a plastics flammability standard released by Underwriters Laboratories of the United States.The standard determines the material’s tendency to either extinguish or spread the flame once the specimen has been ignited. UL-94 is now harmonized with IEC 60707, 60695-11-10 and 60695-11-20 and ISO 9772 and 9773.
From lowest (Least flame-retardant) to highest (Most flame-retardant):
HB: slow burning on a horizontal specimen; burning rate < 76 mm/min for thickness < 3 mm or burning stops before 100 mm
V-2: burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed.
V-1: burning stops within 30 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.
V-0: burning stops within 10 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.
5VB: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may develop a hole.
5VA: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may not develop a hole.
Tests are generally conducted on a 5" x 1/2" (12.7 cm x 1.27 cm) specimen of the minimum approved thickness. For 5VA and 5VB ratings, tests are performed on both bar and plaque specimens, and the flame ignition source is approximately five times as severe as that used for testing the other materials.
Foam and films
This section needs expansion. You can help by adding to it. (May 2015)
There are other classifications that apply to low density foam materials (HF-1, HF-2, HBF) and thin films (VTM-0, VTM-1, VTM-2).
HF-2: burning stops within 3 seconds; afterglow less than 30s; burning drips allowed.
HF-1: burning stops within 2 seconds; afterglow less than 30s; no burning drips allowed.
>>>>>>Note: Partial datas from Wikipedia<<<<<<