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| Hardness Scale |
Reading Variance |
Number of Readings |
Variance of Average |
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| 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 |
| 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 | Ceramic pallets for semi-conductor wafer pallets |
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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 |
Barcol-Impressor.com A Division of InstruCon, Inc. 3415 Precision Drive Rockford, Illinois 61109 USA Phone: 1.815.874.2000 Fax: 1.815.874.2211 General E-Mail: orders@instrucon.com Barcol Impressor® is a Registered Trademark of InstruCon, Inc. |