The Pencil Hardness Test By Mac SimmonsThis article appeared in Woodwork
April pand is used here by permission A set of graded pencilsAfter doing some testing on various coatings for their 'pencil hardness' I was surprised at the results I got.InquiryThe pencil hardness test
also referred to as the Wolff Wilborn test uses the varying hardness values of graphite pencils to evaluate a coatings hardnessThe Elcometer Pencil Hardness Tester has been designed to ensure that the cylindrical pencil lead is maintained at a constant angle of ° and exerts a force of N (.lbF).InquiryA pencil hardness test is a type of evaluation method that is performed to determine the hardness of a material
typically coating materialsTo perform a pencil hardness test graphite pencils of varying hardness are moved across a coating's surface.Inquiryhardness () and scratch hardness () for each pencil or leadReport Report the following information The two end points as follows Gouge HardnessThe hardest pencil that will leave the lm uncut for a stroke length of at least mm ( in.) Scratch HardnessThe hardest pencil that will not
InquiryASMT D is a test method designed to evaluate the hardness of a coating through the use of pencil or ding leadsThe cure of the coating may also be assessed by this standardLastly
this test protocol may be employed after an accelerated aging test in order to characterize the evolution of the hardness of the material over time.InquiryUsing the pencil hardness test can also be useful in comparing products from different manufacturersFor example
a polyurethane from one company may have a pencil hardness of H while polyurethane from another supplier may be differentI suggest you do your own testing to know the true hardness of the coatings brand you use.InquiryTHE PENCIL TEST FOR LEAD ALLOY HARDNESS Ken Mollohan The pencil industry manufactures what are called 'art pencils' for draftsmen
artists etcThey are available as either conventional wood sheathed graphitic cores or as a mechanical pencil for which you only buy the graphitic cores and insert them as desired.InquiryASTM D
Test Method for Film Hardness by Pencil Test is now the appropriate test method for this propertyToday D describes a procedure for a rapid inexpensive determination of the film hardness of an organic coating on a substrate in terms of using leads or pencil leads of known hardness.InquiryTek Tip Pencil Hardness Test Pencil Hardness measurements have been used by the film industry for many years to determine the scratch hardness of a particular coated filmThe test for pencil hardness is rather simple to do
however results may vary depending on the equipment and procedure used for the test.InquiryStandard procedure for testing hardnessThere are two different types of common tests for testing the hardness of the pencilThe tests are ASTM D
and JIS K used to measure the hardness of the pencilBefore starting any test you just need the following things to perform the test.Inquiry