... 2. Specification Test Method: GB/T 7384, HG/T 3505, GB/T 6365, GB/T 7380 Type: Span 20 Hydroxyl value ... 2. Specification Test Method: GB/T 7384, HG/T 3505, GB/T 6365, GB/T 7380 Type: Span 40 Hydroxyl value ... 2. Specification Test Method: GB/T 7384, HG/T 3505, GB/T 6365, GB/T 7380 Type: Span 60 Hydroxyl ... 2. Specification Test Method: GB/T 7384, HG/T 3505, GB/T 6365, GB/T 7380 Type: Span 85 Hydroxyl value ...