What is Norma Din 53505.pdf and How to Use It?
Norma Din 53505.pdf is a document that specifies the standard method for measuring the hardness of rubber materials using Shore A and Shore D durometers. Hardness is a property that reflects the resistance of a material to deformation by an indenter. The
hardness of rubber depends on its viscoelastic properties, especially the elastic modulus, which is the ratio of stress to strain.

Norma Din 53505.pdf
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Shore A and Shore D durometers are instruments that measure the depth of indentation of a rubber sample by a spring-loaded indenter with a specific shape and size. Shore A durometers are suitable for testing soft to medium-hard rubbers, while Shore D
durometers are used for testing hard rubbers. The hardness value is expressed in Shore units, which range from 0 to 100. The higher the Shore value, the harder the rubber.

The standard method for testing rubber hardness using Shore durometers is described in Norma Din 53505.pdf, which is based on DIN EN ISO 868 and ISO 7619-1. The document provides the specifications of the durometers, the test conditions, the test
procedure, and the precision data. The document also gives an overview of other hardness testing methods for rubber, such as the ball indentation method.

To use Norma Din 53505.pdf, you need to have a Shore durometer of type A or D, depending on the hardness range of your rubber sample. You also need to have a test piece of rubber that is flat, smooth, homogeneous, and free of air bubbles or defects. The
test piece should have a thickness of at least 6 mm for type A durometers and at least 3 mm for type D durometers. The test piece should be conditioned at a temperature of 23 ± 2 °C and a relative humidity of 50 ± 5 % for at least 16 hours
before testing.



The test procedure involves placing the test piece on a rigid and horizontal support, and applying the durometer perpendicular to the surface of the test piece with a force of about 1 N. The durometer should be held firmly without any lateral movement or
vibration. The hardness reading should be taken after 3 seconds of contact between the indenter and the test piece. The reading should be rounded to the nearest whole number. At least three measurements should be made on different locations of the test
piece, at least 6 mm apart from each other and from the edge of the test piece. The mean value of the measurements should be reported as the hardness value.

Norma Din 53505.pdf is a useful document for anyone who needs to measure or compare the hardness of rubber materials using Shore durometers. It provides a reliable and standardized method that ensures accuracy and repeatability of the results.


Norma Din 53505.pdf also provides some information on the factors that can affect the hardness measurement of rubber materials. Some of these factors are:


The temperature and humidity of the test environment and the test piece. Higher temperature and humidity can reduce the hardness of rubber, while lower temperature and humidity can increase it.
The aging and degradation of the rubber material. Over time, rubber can lose its elasticity and become harder due to oxidation, heat, light, ozone, or chemical exposure.
The surface condition and geometry of the test piece. Rough, uneven, or curved surfaces can affect the contact area and pressure between the indenter and the test piece, resulting in inaccurate readings.
The type and calibration of the durometer. Different durometers may have different scales, accuracy, and sensitivity. The durometer should be calibrated regularly using standard reference blocks to ensure its proper functioning.

Therefore, it is important to follow the standard method and conditions specified in Norma Din 53505.pdf when testing rubber hardness using Shore durometers. This will help to obtain consistent and comparable results that reflect the true properties of
the rubber material.
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