ISO 9773
确定可燃性的特征n-rigid solid plastics
ISO 9773 determining the flammability characteristics of non-rigid solid plastics
classification provided: VTM-0, VTM-1 or VTM-2.
ISO 9773 test method describes a small scale laboratory test for determining the comparative burning characteristics of solid plastic materials that due to specimen thickness and non-rigidity distort or shrink when tested under ASTM D 3801 or IEC 60695-11-10.
Specimen:Four sets of 5 specimens with nominal dimensions 200mm 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:Set the methane gas flow to 105 ml/min. Adjust the flow and air intakes of the burner to get a clean blue flame 20mm high.
Flame application:20mm Bunsen burner flame.
Flame application time:2 x 3 seconds application. The second flame application time begins as soon as the ignited specimen is extinguished or immediately if the specimen does not ignite.
Measurements:
A –Duration of flaming after first flame application (seconds).
B –Duration of flaming after second flame application (seconds).
C –Duration of glowing after second flame application (seconds).
D –Whether or not specimens burn up to the 125mm mark.
E –Whether or not specimens drip flaming particles which ignite cotton swatch.
Based on the measured values use the following table to classify the material as VTM-0, VTM-1 or VTM-2.
Test setup:
The Bunsen Burner and the test specimen is setup as shown in the test schematic.
