 |
Rockwell C(High) Hardness Range
C
150 kgf
diamond
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20 |
HV
Vickers
Scale
940
900
865
832
800
772
746
720
697
674
653
633
613
595
577
560
544
528
513
498
484
471
458
446
434
423
412
402
392
382
372
363
354
345
336
327
318
310
302
294
286
279
272
266
260
254
248
243
238
|
HK
Knoop
>500gf
920
895
870
846
822
799
776
754
732
710
690
670
650
630
612
594
576
558
542
526
510
495
480
466
452
438
426
414
402
391
380
370
360
351
342
334
326
318
311
304
297
290
284
278
272
266
261
256
251
|
HB
Brinell
10/3000
-
-
-
739
722
705
688
670
654
634
615
595
577
560
543
525
512
496
481
469
455
443
432
421
409
400
390
381
371
362
353
344
336
327
319
311
301
294
286
279
271
264
258
253
247
243
237
231
226 |
OPTA MINERALS has production and warehouse facilities in the following locations: Brantford, ON; Waterdown, ON; Lachine, QC; Laval, QC; St-Bruno-de-Guigues, QC; St-Germain-de-Grantham, QC; Norfolk, VA; New Orleans, LA; Los Angeles, CA; Hardeeville, SC; Attica, NY; Baltimore, MD; Keeseville, NY; Walkerton, IN; Milan, MI; Richfield, OH. |
