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Your location: Home > Related Articles > Sponge foam indentation hardness test experiment

Sponge foam indentation hardness test experiment

Author:QINSUN Released in:2023-09 Click:145

Sponge foam indentation hardness test experiment

Main application scope and functions
Mainly applicable to soft foam polymer materials such as: sponges, foams, etc. The indentation hardness of method A and method B required by national standards, method C and other testing conditions, carry out standard tests on sponges, foams and other samples of standard sizes to determine the concave hardness index, concave hardness characteristics, concave hardness inspection and compressive stress testing of sponges, foams and other materials.

Complies with standards:
GB/T 10802 Flexible polyurethane foam
GB/T 10807-2006 Determination of hardness of flexible foam polymer materials (indentation method)
GB /T 12825-2003 Determination of hardness of poroelastic polymer materials by indentation method
GB/T 18942.1-2003 Determination of Compressive Stress and Strain Characteristics of Poroelastic Polymeric Materials Part 1 Low Density Materials
ASTM D3574Flexible Porous Materials - Test Methods for Panels, Bonded and Molded Polyurethane Foams
GBT 26392-2011 Determining the Recovery Time of Slow Rebound Foam

Software Instructions for Use:
Pre-concavity:
Apply a force of 5 N to the sample to measure the thickness of the sample, press 70% of the sample thickness at a speed of 100MM/MIN, then unload at the same speed
Method A—Index Determination of indentation hardness:
After three pre-pressures, indent the test piece to a thickness of 40% and hold it for 30S, and record the force value
Method B---Determination of indentation hardness characteristics:
After three preloads, dent the thickforce value of the sample by 25% and hold it for 30S, and record the force value
Increase the concavity degree from 25% to 40% and hold it for 30S, and record the force value force
Increase the concave degree from 40% of the thickness of the concave specimen to 65% and hold it for 30S, record the force value

Calculation of concavity coefficient:
The required force value for concave degree 25%/Required force value for tooth degree 40%
Required force value for tooth degree 65%/Required force value for the degree of dent 40%

Method C --- Indentation hardness test Measurement:
After performing three pre-concave tests, measure the instantaneous maximum value after pressing 40% of sample thickness

Method D --- Free adjustment test method:
You can carry out the test according to your own requirements. This method of yourt is defined according to foreign standards. For example, the following test is required: Compression is required 5 times
1. For the first time, compress to 30% of the original thickness at a speed of 150 mm/min. %, returnReturn to the initial state.
2. After a pause of 5 seconds, compress to 40% of the original thickness at a speed of 90 mm/min and return to the initial state.
3. After a pause of 3 seconds, compress to 75% of the original thickness at a speed of 300 mm/min and return to the initial state.
4. After a pause of 1 second, compress to 50% of the original thickness at a speed of 75mm/min and return to the initial state.
5. After a pause of 2 seconds, compress to 40% of the original thickness at a speed of 50 mm/min and return to the initial state.

Technical parameters:
1. Default speed: 100 mm/min; can be adjusted freely
2. Indentation hardness measurement range: 0-1500 N
3. Mid resolutionMaximum force measurement: 0.01N
4. Measurement error: <1%
5. Penetrator Diameter: 200MM
6. Effective stroke of pressure plate: 150MM
7. Voltage: 220V/50HZ
8. Equipment size: length, width and height-550MM*400MM*1200MM
9. Equipment weight: 150KG

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