Pencil hardness ASTM D3363 [Paint Testing]

Not only visual artists use different hardness of pencils, but also ... paint laboratories. See how the pencil hardness test is performed in our laboratory according to ASTM D3363

[@bellaadvincula8165]

Hi! What machine was used to set the pencil according to the standard at 0:50 before using the performance test?

[@SpektrochemResearchLaboratory]

It's a vernier caliper used to check whether the length of the pencil lead complies with the provisions of the standard

[@vikash_prajapati93]

Excellence

[@SpektrochemResearchLaboratory]

Thank you!

[@harshitrathore1654]

what is the scratching distance here?

[@SpektrochemResearchLaboratory]

As in the standard, 6.5 mm, but sometimess in required to make a test in other length.