茶叶吃水受潮后的保存技术

GRIT NO. 砂纸目数 USA FINISH # 美国光洁度号 COMMON NAME [USA] Ra MICROINCH 美 国Ra μin E/P RANGE Ra MICROINCH [UK] Ra MICRON 英 国Ra μm Rmax MICROINCH [JAPAN] Rmax MICRON APPROX. RMS MICROINCH ISO NUMBER ASTM STD Ra MICROINCH JAPANESE STANDARD 2000 50 7875 200 N12 1000 25 3940 100 N11 500 12.5 1968 50 N10 60 #1 Mill Plate 250 50 Max. 6.3 985 25 N9 140 Max. 125 3.2 492 12.5 N8 80 #2 Satin Sheet 70 Max. 80 40 - 60 63 1.6 6.3 N7 100 - 120 #3 52 58 120 #4 Commercial #4 40 - 60 typ. 150 #4 3A Sanitary Finish 42 Max. 42 - 47 46 Max. 30 - 35 ANSI #4 Sanitary 32 0.8 126 3.2 N6 180 #4 30 Max. 15 - 20 34 25 Max. Buff #100 20 - 30 200 - 220 #4S Biothech Finish 25 Max. 20 - 25 240 #6 15 - 20 10 - 15 17 8 - 20 16 0.4 63 1.6 17 Max. N5 6 - 15 320 #7 12 Max. 8 - 12 12 0.3 42 1.5 13 - 14 Buff #200 8 0.2 31 0.8 8 N4 Buff #300 400 #8 Mirror Finish 4 - 8 500 #8 Supermirror Finish < 4 3 - 8 500 #8 Supermirror Finish 4 0.1 16 0.4 4 - 10 N3 Buff #400 2 0.06 8 0.2 N2 1 0.025 4 0.1 N1 ↑ Common USA name. ASTM A480. SURFACE FINISH CROSS REFERENCE CHART 表面抛光对照表