Desiccant for Auto Headlights
In order to dry the interior of the lamp, the lamp mask does not produce fog and flow marks, and the environmentally-friendly desiccant for moisture absorption inside the lamp is used to be called the lamp desiccant.
Requirements for packaging paper for lamp desiccant
| Performance test project | Index | Test Method |
| Pull-off expansion rate /% | 8% | Refer to GB/T 24228.3-2010 |
| Tear strength / (N / mm) | 2.3% | Reference GB/T 24228.3-2010 |
Test instrument:
1) Tensile tester, which is of constant velocity elongation type. A device that automatically records the force applied to the sample and the spacing of the holder.
2) The holder has a clamp that can firmly hold the entire width of the sample without damaging the sample.
Sample requirements:
Sampling according to product specifications. Take a full width sample as much as possible and its length is about 1m to ensure that the sample taken has no obvious defects and wrinkles.
1) Take 5 samples each in the longitudinal direction of the sample (machine output direction) and the lateral direction (the width direction of the cloth). The cut sample is at least 100 mm from the edge of the cloth and is evenly distributed in the longitudinal and transverse directions of the sample.
2) The width of the sample is 50mm ± 0.5mm, and the length should meet the nominal clamping distance of 200mm.
Test method
1) The test is carried out in a standard atmosphere. The standard atmosphere is 20.0 ° C and the relative humidity is 65.0% according to the provisions of GB/T 6529. Set the nominal clamping distance of the tensile tester to 200 mm ± 1 mm and hold the sample at the center of the holder. The pre-tension is specified in GB/T 3923.1, and the test sample density is less than 200g/m2, so the pre-tension is 2N.
2) The machine was started and the sample was stretched at a constant elongation rate of 100 mm/min until it broke. Record the strength-elongation curve of each sample as needed.
3) Record the maximum force during the tensile process of the specimen as the breaking strength in Newtons (N). If multiple strong peaks appear during the test, take the highest value as the breaking strength and record the phenomenon in the test report. The elongation of the sample at the breaking strength was recorded as the elongation at break. The average breaking strength of the five specimens in the longitudinal and transverse directions was calculated separately, and the unit was Newton (N). The result was accurate to 0.1 N. The average elongation at break was accurate to 0.5%, and the coefficient of variation was calculated.
4) If the fracture occurs at the jaw position or the specimen slips off at the jaw, the test data is invalid. Another sample is required to be retested to replace the invalid sample.
Normative references:
Textiles -- Test methods for textile nonwovens - Part 3: Determination of breaking strength and elongation at break
GBT 6529-2008 Standard atmosphere for textile conditioning and testing
