The hardness is determined by the amount of clay added to the pencil leads during production, the more clay then the harder the pencil. In the paint and coating industries, paint adhesion testing is often used to determine if the paint or coating will adhere properly to the substrates to which they are applied. The 'H' in the HB scale stands for hardness. Providing quality control instruments … "Pencil Hardness" is a simple test that can tell you the hardness of the coatings you are using. The pressure on the tip can be changed using the slide or by changing the spring. Specialized Hardness Testers. Paint Workability - The Hardness or Softness of your car's paint "You don't how hard or soft your paint is until you go out into your garage and work on your car" Mike Phillips Director of Training Autogeek & Marine 31 IDA Board Member - Certified Detailer - Skills Validated Detailer - … In the absolute scale of the hardness (of Rosiwal), the abrasion resistance is measured with proofs from laboratory, and by attributing to the corindone the value 1000. There is one last letter designation that you may come across, which is “F.” “F” stands for “fine” lead, which is manufactured specifically so that it maintains a fine point. With biasing at the early stage of deposition, the failure mode is changed from compressive spallation to wedge spallation, which obviously shows the improvement in coating adhesion strength. Paint Correction on Very Hard Paint: When dealing with very hard paint, the difficult part is the compounding stage to get a high level of correction. These scales are not similar! Hardness is usually based on Mohs Hardness Scale. The set of Elcometer 3080 Hardness Testing Pencils is a simple but effective technique to evaluate the hardness of many coatings. Pencil hardness is a popular test in the paint industry. This lets the end-user know if the hardness is appropriate for the end-use application. Everything You Need to Know About Pencil Lead Hardness. There are many factors that can affect and change the characteristics of paint for correction over time. Strip the wood from the lead of a standard drawing pencil for a Pencil Hardness – film (Ceramic Coatings / PPF / Paint) test method using the world standard ASTM D3363. The full hardness scale ranges from 9H (being the hardest) to 9B (being the softest), with “HB” perfectly in the center. Pencil hardness is a popular test in the paint industry. I … The pencil hardness method was originally developed by pencil manufacturers as a quality control method in the early 1900’s, if two different pencils cause the same scratch damage to a coating then they are considered the same hardness, simple. This can be a range of H or Hard levels, or a range or black or B levels. Cadillac I'd put at the hardest, dodge / mopar's in general are pretty soft. The TQC Hardness Pen is a pocket instrument for testing the hardness and wear/scratch resistance of materials such as coatings, lacquers, plastics or related products. The 'H' stands for hardness, the 'B' stands for blackness, and HB is for hard and black pencils. The hardness rocker is cut from a solid bar of brass by a combination of conventional and electrical discharge machining. For example, two of the exact model cars, say 5 years old, painted back to back in the same factory can react completely different to corrective steps. It is used to determine scratch (mar) and/or gouge hardness of coatings. Pendulum hardness test is the most common test relateed to fatigue resistance against periodic deformation. Determine the relative hardness of resins, film, lacquer, and paint by testing their resistance to scratches by graphite pencils. Pencil Hardness Tester (ASTM D3363) Sward Rocker Hardness Tester (ASTM D2134) Buchholz Hardness Tester (ISO 2815:2003) Vicker's microhardness (no any standard available particularly for … We’ll go into the Mohs scale … Using these ordinary materials of known hardness can be a simple way to approximate the position of a mineral on the scale. Broad overlapping is apparent when one considers the standard deviations of the individual test series. Reprinted with permission from Custom Woodworking Business. Trying to categorize paint hardness may get you into trouble when approaching a vehicle. 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