The 9H hardness is now one of the most talked term in car care not just in India but across the world. But in some matured markets, sellers stopped mentioning about hardness of their ceramic coating because people are more educated there on this, it may sound funny but it’s the truth. Hence the term “9H hardness” will be continue to be (miss)used until we all get educated. And, yes we are trying to do that for you with this blog.
It’s a unit of hardness on Mohs hardness scale of minerals.
The Mohs hardness scale of minerals is named after a famous German geologist, Friedrich Mohs, who created this scale in 1812 to determine which mineral is harder than the other. A simple test, which only shows which piece of mineral is harder than the other.
Diamond is having 10H hardness on the Mohs scale.
All of us use pencils. You surely recognise nice and soft 4B pencils, the most common HB pencils and the thin, sharp lines of 4H.
Here, it certifies the hardness as the capacity of a given surface to resist scratching or marring with a pencil. When expressing the measurement of pencil hardness, it’s done with a value that ranges from 6B (softest) up to to 9H (hardest). The value is recorded as the hardest pencil that does not scratch or mar the surface.
A fully dried and cured coating applied to a steel plate is being scratched with a variety of pencils at an angle of 45′ with a weight (500g to 1kg). That pure metal has completely different hardness and characteristics than automotive paint. And what does this test proof? It’s just a certificate which proves that the coating can achieve the 9H hardness, that’s all.
How important is the hardness?
Almost every quartz/ceramic/glass coatings can reach 9H in the pencil hardness scale. In real life conditions, there are far more important factors than the hardness! The slickness and structural integrity of a coating is the crucial and main factor, that influences the real, every-day experience with a coating. And this is exactly what the famous cigarette lighter test proves, the way it helps in real life is that it can reduce the impact of any scratches.