I. UL certification number of Toyo Express, North Vietnam Express, Fireproof Express, Red Steel Paper: E55656
Questions:
The company's Dongyang express paper, North Vietnam express paper, fireproof express paper, red steel paper express paper, do moisture test after humidity test (humidity 90%, 48h), do not withstand voltage insulation (1840v). Please find a way to solve this problem without absorbing moisture.
answer:
The manufacturer responded with two views,
1. Technical level insights:
Factory inspection report Insulation failure strength data 14.3
Average 13.6 Minimum unit kv / mm; 105 degrees 24 hours 0.4MM * 13.6 = 5576 kV Test conditions for minimum insulation failure strength Based on JIS C 2315, please check online.
2. Reference insights:
Toyo Express Paper, North Vietnam Express Paper, Fireproof Express Paper, Red Steel Paper Express Paper are considered for their insulation properties and must not be used after being wet.
However, its physical properties guarantee that after absorbing moisture, the design indicators in the dry state before moisture absorption can still be linearly restored in the case of natural drying or drying. Therefore, if you want to prevent moisture absorption, you can only keep him away from moisture, or use it after testing after drying.
Three. Attached tide test method:
Tide test product categories: Toyo Express Paper, North Vietnam Express Paper, Fireproof Express Paper, Red Steel Paper
Test item: Tide test
Test equipment: vacuum cleaner, thermometer, hygrometer, constant temperature and humidity box
Before testing:
1. Before testing, check the function and appearance of Toyo Express, North Vietnam Express, Fireproof Express, and Red Steel Paper.
2. The sample should be placed in a test room with normal atmospheric environment for 24 hours before testing.
3． Remove the detachable part and test it with the host.
4． Place a saturated aqueous solution of Na2SO4 or KNO4 in a constant temperature and humidity box, and make full contact with the air. In this way, (93 ± 2)% phase humidity can be obtained.
Test procedure:
1. Put the sample in the constant temperature and humidity box (93 ± 2)% for 48h. (The temperature of the air should be within 1K of any convenient value t between 20 ℃ and 30 ℃.)
2. After 48 hours, reassemble the removed parts and pass the insulation withstand voltage test. Test requirements: The sample can pass the insulation withstand voltage test under humid conditions.
