How to test the hardness of silicone foam

 

Silicone foam has soft series foam material, fast rebound series foam material and hard series foam material. Energy management for sealing and gasket applications. Provides a higher level of vibration isolation protection for extreme demand environments.

 

Silicone foam provides good shock absorption, impact resistance and other properties for industrial production parts:

In vehicles, electronic equipment manufacturing and aerospace applications. Silicone foam material provides good shock absorption, absorbs and disperses impact kinetic energy, and protects components from working pressure. Most shock-absorbing cushions will be damaged after a period of application, but the silicone foam material has excellent air permeability due to its unique perforated structure, and will not be damaged after continuous application. These silicone foam materials have excellent fluid density and conformability, resist shrinkage and stress relaxation. Silicone foam material can provide the coordination ability, long-term shock resistance and excellent shock absorption effect required for daily necessities design.

Silicone foam compression hardness test method

• The test silicone sheet is a piece of 148mm*50mm round silicone foam

•External forces such as compression deformation cannot be applied to the test before accurate hardness measurement.

• The rate of lowering of the compression plate of the measuring instrument is listed as 60. (lowering rate 50HZ: 0.3 mm/sec)

• Make sure the load scale is zeroed.

 

Foam indentation hardness tester

•Hardness test operation process

• Put the sample into the compression tray, and the distance between the top, bottom, left and right is the same, and it matches the management center of the compression tray.

• When the compression plate is lowered to 0.5kg of the sandbag leggings, stop and record the scale.

• Compression test anticipates 75% of its thickness (ready to compress)

The ruler when the sandbag leggings are 0.5kg (the thickness of the test piece * 0.75) = ready to compress the ruler

(Precisely measure the thickness of the test piece before testing)

• Immediately lower the compression disc: Compression sample (reservation compression)

• Compression test stops lowering the compression disc when the gauge is expected to be 25% of its thickness, and also press and hold the timer to measure the time gradually and accurately. The gauge when the sandbag leggings are 0.5kg (the thickness of the test piece*0.25) = when the hardness is measured (25% when compressed) ruler.

• After compressing 25% of the thickness for 20 seconds, the enterprise loads a load of 0.1 kg, and pay attention not to exceed 20 seconds.

• The load value is the hardness. (Enterprise: kg/314c㎡)

 

10kg above the decimal place, the first digit below the decimal place is rounded up to the whole number. If the 10kg is not full, the first digit below the decimal place is rounded up, and 0.5kg is the enterprise. 2.8. After measuring, raise the compression plate , remove the test piece and test.

 

Silicone foam ASKER-F hardness tester measuring method

• Take a test sheet with a specification of: 220mm*220mm*50mm,

•If the test sheet is a new test piece, compress it first, and then test it again after one minute. If the test sheet is the test piece that has been tested by the compression hardness method, do this kind of measurement after one minute.

• Gradually place the hardness tester on the surface of the test piece

•Put the durometer on, let go of the hand for about five seconds, and then load the stationary scale value

•Place a piece of test piece equally and randomly in ten different areas to measure, round up to take the average value, which is the hardness

Silicone foam relative density test method

•Application field: suitable for density measurement of foam vulcanized rubber and foam plastic

•Definition: The quality of foam per enterprise volume at a set temperature and air humidity

•equipment:

•Electronic scale: can accurately measure to 0.5% of the quality of the sample

• Measuring ruler: ruler

 

Sample:

•Measurement: The sample must have a volume that facilitates accurate measurement, and the main bone structure of the chemical substance must be prevented from being deformed during laser cutting. The volume of the sample must not be less than 100cm3. It is best to cooperate with the equipment and the chemical substance to be sampled. As far as possible, try to make the sample volume as high as possible. And record the existence of the sampling site and the surface skins of the solid model.

• Number of samples: at least 3 samples must be taken

•Pre-solution: The chemical substance to be tested must be carried out at least three days after the production is carried out

 

process:

•Accurate measurement test limit: the enterprise is mm, each limit must be accurately measured three times, and the average value is used to measure the volume of the sample

• Plot weight sample: Accurate to 0.5% in grams

 

the result shows:

m: the quality of the sample (g) v: the volume of the sample (mm3)

v: volume = thickness (mm) X length (mm) X total width (mm)

 

Silicone foam hardness hardness and softness test

Hardness refers to the resistance to work exhibited by the silicone foam when a hard object is pressed into its surface. The higher the wear resistance, the higher the hardness. The hardness test is one of the key indicators for silicone foam. At present, there are three common hardness index values, such as Brinell hardness, Rockwell hardness and Vickers hardness.

 

In addition, there are also Shore hardness tester, Barcol hardness, Barcol hardness, Shore hardness, etc., and test methods; Shore hardness tester has the advantages of easy portability, beautiful appearance, light weight, etc. Generally, the key to test silicone foam is Shore hardness more extensive.