China National Standards

China 3B、4B、3BR、2RB GB Standards List

  •  China "3B、4B、3BR、2RB" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 1655-2013 Sulphur Black 3B、4B、3BR、2RB(Sulphur Black BN、BRN、B2RN、RN)
    硫化黑3B、4B、3BR、2RB(硫化黑BN、BRN、B2RN、RN)    		 China National Standards
    3B、4B、3BR、2RB
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