Opta Waive
Empower our customers to achieve optimal results by providing the quality products they need and the exceptional service they deserve!

Rockwell C (High) Hardness Range

C HV  Mohs HK HB
150 kgf Vickers Mohs Knoop Brinell
diamond Scale  Scale >500gf Oct-00
80 1860 8.64    
79 1790 8.47    
78 1710 8.31    
77 1630 8.14    
76 1560 7.97    
75 1480 7.78    
74 1400 7.59    
73 1320 7.4    
72 1240 7.21    
71 1160 7    
70 1080 6.76    
69 1000 6.56    
68 942 6.38 907  
67 894 6.23 881  
66 854 6.11 859  
65 820 6.01 841 745
64 789 5.91 814 711
63 763 5.82 790 710
62 746 5.76 775 683
61 720 5.67 751 682
60 697 5.59 730 653
59 674 5.52 710 627
58 653 5.44 688 579
57 633 5.37 667 578
56 613 5.29 646 556
55 595 5.22 627 555
54 577 5.16 608 534
53 560 5.09 590 514
52 544 5.03 573 496
51 528 4.97 556 495
50 513 4.91 540 477
49 498 4.84 524 461
48 484 4.78 508 445
47 471 4.73 494 444
46 458 4.67 480 432
45 446 4.62 467 416
44 434 4.57 454 415
43 423 4.52 441 401
42 412 4.47 430 389
41 402 4.42 419 388
40 392 4.37 408 375
39 382 4.33 398 363
38 372 4.28 387 352
37 363 4.23 378 341
36 354 4.19 368 332
35 345 4.15 359 331
34 336 4.1 349 321
33 327 4.06 340 311
32 318 4.01 330 302
31 310 3.97 322 293
30 302 3.92 314 285
29 294 3.88 306 277
28 286 3.83 297 269
27 279 3.79 290 262
26 272 3.75 283 256
25 266 3.72 277 255
24 260 3.68 271 248
23 254 3.65 265 241
22 248 3.61 258 235
21 243 3.58 253 229
20 238 3.55 248 223

Opta Minerals - Your one source for:

Blast Cleaning Abrasive Products

Blast Cleaning Equipment

CLEMCO

ZERO

Construction Products

 

 

Foundry Products

Magnesium Products


 

Steelmaking Products

Recycling of By-products

Waterjet Cutting Products

Water Filtration Products