GB/T 1633 — 热塑性塑料维卡软化温度测定 GB/T 1633-2000 热塑性塑料维卡软化温度测定. 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