The balance of hardness with other final film properties is determined by the end use of the product. A bnh of around 11 15 is recommended for most cast bullets in the moderate velocity range.
Astm test method d3363 allows the use of pencils of a known hardness to be moved over the surface of the test sample at a fixed angle and pressure to perform the test.
Powder coating hardness. Gives the highest exterior stability and performance. The brinell number hardness bnh scale is a method of determining the hardness of metals. Once you ve established good cure the pencil hardness test is an effective method to test coatings for their hardness and their scratch resistance.
When comparing hardness values listed on a coating manufacturer s product data sheet the information is frequently considered an indication of its degree of cure and its inherent performance. Has superior corrosion protection and hardness. I used lanco tf 1778 and i had good resistance b but now i use same components and my hardness is 2b.
Has a flexibility and hardness more suited for moving parts. The absolute hardness of a coating is not always the ultimate goal of the formulation and an increase in hardness can be accompanied by brittleness or a decrease in the flexibility of the coating. 2 3 powder coating powder coatings can be considered one of the young est coating technologies with a history of only about 60 years.
Coating of diamond like hardness 138 146 0 94 0 95 5 15 20 7 ceretan mxf 9820 d functional blend ptfe 108 118 0 94 0 95 2060 8. The coating has a lower flexibility hardness and or impact resistance than expected directly after application potential cause a change has been made in the substrate or pre treatment system without making changes in the process. A 15 bnh hardness alloy for example would be 90 lead 5 tin and 5 antimony.
I have problem with hardness in our powder coat. However no other technology went through.