Barcol impressor hardness tester
             
Recommended Sample Sizes
  Hardness
Scale		 Reading
Variance		 Number
of Readings		 Variance
of Average
Homogeneous
Material		 20
30
40
50
60
70
80		 2.47
2.20
1.93
1.66
1.39
1.12
0.85		 9
8
7
6
5
4
3		 0.27
0.28
0.27
0.28
0.28
0.28
0.28
Reinforced
Plastics		 30
40
50
60
70		 22.4
17.2
12.0
7.8
3.6		 29
22
16
10
5		 0.77
0.78
0.75
0.78
0.75
Internet supplied EXAMPLES of typical Barcol hardness readings:
35 Nu-Lite Polystyrene Panels
30-40 Duroplastic swimming pool liners
35 DOW Derakane 411 laminate
35 Valspar Composite Boat Repair 5783R90015 Red Tooling Gel Coat
36.5 Pearlveil fiberglass
49 Cyro Acrylic Plastic Sheet
50 Polyester Pultruded
65 Melamine Plastic Abrasives
68 Polyester SMC Compression
100 pallets for semi-conductor wafer pallets

This information is for general guidance purposes only. For Barcol readings that are part of a quality control application, please contact the original manufacturer of the metal, plastic, laminate, or other material for their specific Barcol recommendations. All trademarks and all product applications shown above are the property of their respective owners. Barcol-impressor.com is not responsible for the accuracy of the above examples, since the information is collected by others.

Barcol-impressor part numbers are shown at: Barcol-impressor part numbers