ISO 9772 Foam Plastic Horizontal Burning Test Machine / UL94 HBF Flammability Tester
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ISO 9772 Foam Plastic Horizontal Burning Test Machine UL94 HBF Flammability Tester
Description:
ISO 9772 Cellular plastics — Determination of horizontal burning characteristics of small specimens subjected to a small flame ASTM D4986 Standard Test Method for Horizontal Burning Characteristics of Cellular Polymeric Materials GB/T 8332 Test Method for Flammability of Cellular Plastic-Horizontal Burning Method UL 94 HBF, HF-1, HF-2 Horizontal Burning Foamed Material Test
Foam products, polymer materials, etc.
This test is intended to be performed on foamed plastic materials.
Specimens: Four sets of 5 specimens with nominal dimensions 150mm x 50mm and in minimum and maximum thickness.
Specimen conditioning: Two sets of 5 specimens per sample were conditioned as follows: i. First set at 230C and relative humidity 50% for minimum of 48 hours. ii. Second set in an air circulating oven for 168 hours at 700C and then cooled in a desiccator for minimum of 4 hours.
Gas flow: Attach a wing tip to the Bunsen burner, and adjust the gas flow till a clean blue flame 38mm high is obtained.
Flame application: 38mm Bunsen burner flame
Flame application time: 60 seconds.
Measurements for HF-1 and HF-2 A – The flaming ceases (afterflame). B – The flaming and glowing ceases (afterglow). C – The flaming or glowing front reaches the 125mm mark or when the specimens ceases burn or glow before 125mm mark. D- The distance specimen burnt up to 60mm mark or if the 60mm mark passed. E- The dripping particles ignited the cotton placed below.
Measurements for HBF A – The duration of burning between the 25mm mark until flaming or glowing stops or passes 125mm mark. B – The distance the specimen burned in mm between 25mm mark and where the flaming / glowing stops or up to 125mm mark. C- burning rate expressed in mm/min.
Based on the measured values the specimen is classified HBF if it meets the all of the following conditions: i. Burning rate C expressed in mm/min is less than 40mm/min over a 100mm span. ii. Each specimen should cease to burn before flaming or glowing reaches 125mm mark.
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