Needle Flame Test determines the impact of a small flame on the test specimen. In particular, it calculates the severity, in other words the exposure time to the flame after which the material will just about meet the specified requirements. is used to determine in under the conditions specified in the flame test does not make part burning, or test flame ignites the combustible components, but parts of the combustion duration or length of combustion is limited and flame or from the test sample falls under burning or glowing particles will not enable combustion.
Purpose:Needle flame test apparatus is in terms of size (diameter 0.9mm) needle burner, to specific gas (butane), to an angle of 45 DEG timing orienting application fuel sample and visual test is ignited and to burning time and burning length to evaluate the internal equipment due to fault conditions caused by the small flame of fire risk.
Methods:
The test flame is applied to the surface of the test sample which is most easily affected by the flame, and the flame is produced by the normal use and the failure condition.
The duration of the test flame shall be in accordance with the provisions of the relevant standards.
The test flame is positioned at the position of the flame tip and the surface of the test sample. After the prescribed time, the test flame will be removed.
If the flame is applied during the test sample drop melting or flame material, and 45 vertical tilt burner. In order to prevent the material from falling into the combustion tube, the top center of the burner and the remaining part of the test sample is kept between 8 mm L and mm, and the melting material is neglected.
When the relevant specifications require more than one point on the same test sample, the attention should be paid to ensure that the deterioration caused by the previous test does not affect the results of the test.
The test specimen is arranged in a vertical position over tissue paper. A propane gas flame is applied to the edge as well as to the flat surface. The burning time, flammability and severity (exposure time) are determined for this flame application. The test is usually performed on parts or selected areas of these parts. The specimen is subjected to a 12 mm flame (Propane, at least 95% pure). The application time of the flame to the specimen can be 5 s, 10 s, 20 s, 30 s, 60 s or 120 s depending on the specific end product specification.
