ASTM D3363 is a standard test method used to evaluate the hardness of coatings and films using a pencil hardness test. This method involves scratching a series of pencils with varying hardness onto the surface of the film or coating to determine its hardness level.
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Introduction to ASTM D3363
ASTM D3363 is a test method used to determine the hardness of coatings and films. This method is commonly known as the “pencil test” and is widely used in the industry due to its simplicity, speed, and low cost. The pencil test involves the use of a series of pencils with varying degrees of hardness to scratch the surface of the coating or film. The degree of hardness of the pencil that just begins to damage the coating or film is used to determine the hardness level. The results obtained through this method are especially used for quality control, reliability check, performance evaluation, and specification purposes.
ASTM D3363 Test Method
The test method ASTM D3363 involves using a set of pencils with hardness ranging from 6B to 9H, with 6B being the softest and 9H being the hardest. The method proceeds as follows:
Surface Preparation
The surface of the film or coating is cleaned to be tested with a soft cloth or tissue to remove any dirt or debris. The test is conducted by applying the pencils one at a time with a specified force, typically 750 g, at a 45-degree angle to the surface of the film or coating.
Determining Hardness
The test is repeated until the pencil hardness is found that damages the coating or film. If the coating or film is not damaged, the test is repeated using the next hardest pencil (5B) and continues until a pencil is found that damages the surface. The hardness of the coating or film is then determined by the hardness level of the pencil that caused the damage.
ASTM D3363 Specimens
Specimen details
ASTM D3363 specimen is a flat surface of a coating or film, free from any unevenness, such as brush marks, ridges, or other defects that could affect the test results.
Specimen dimensions
The acceptable specimen hardness for ASTM D3363 ranges from 6B to 8H.
Specimen preparation
The pencil test requires a set of pencils with varying hardness, ranging from 6B to 8H. The pencil is held at a 45-degree angle and pressed firmly against the surface of the specimen with enough force to leave a mark.
ASTM D3363 Results
The results of ASTM D3363 are reported as the hardness level of the pencil that caused damage to the coating or film. The hardness level can range from 6B to 9H, with 6B being the softest and 9H being the hardest. Higher hardness levels indicate a more durable and scratch-resistant coating or film.
Tests related to ASTM D3363
ASTM D2794 is a similar test method used to determine the resistance of organic coatings to the impact of a rapid deformation. The test measures the ability of the coating to resist cracking and flaking as an effect of the rapid deformation. ASTM D3359 is another test method used to evaluate the adhesion of coatings to substrates. This test measures the ability of a coating to resist separation from a substrate when subjected to an applied force.
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