i am looking for cast resin joint manufacturer
1. 3721 and 3721-1：Mechanical and electrical applications; 3721 is better than 3721-1 in strength; 3721-1 is the economical product versus 3721 2. 3722, 3723, 3724 and 3725：Similar to NEMA Grade C, CE, L and LE respectively 3. 3840：Mechanical and electrical applications, good moisture resistance. If the usuage is not hindered, it is allowed to have some cracks on top surface or section of rod with diameter more than 25mm. 4. 3841 and 3841F：Similar to NEMA Grade G-10 and FR-4 respectively. If
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