GB/T 1634.3 — 塑料负荷变形温度测定—高强度热固性层压材料 GB/T 1634.3-2004 塑料负荷变形温度测定—高强度热固性层压材料. CNAS-accredited laboratory test standard. Version reference only. No standard text. GB 1033.1 1462 13657 5169.16 5349 228.1 7690.3 GB 9274 1771 1452 5169.12 4618.2 Testing: info@leisa.com