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IRHD Rubber Hardness Tester N H L Test Method

Support 3 kinds of test method N: Normal test, H: high hardness test; L: Low hardness test;
Equipped with 3 work table to suitable test different shape parts;
IRHD-N test range: 30-85IRHD;
IRHD-H test range: 85-100IRHD;
IRHD-L test range: 10-35IRHD;
  • IRHD-DNHL
  • EBP INSTRUMENTS
  • Shanghai, Shenzhen
  • 200 sets per month
  • TT in advance
  • 1 set

This instrument is used to measure the hardness of rubber and similar rubber materials, especially suitable for measuring the hardness of rubber rollers, hoses, cables and rubber products with curved structures. This hardness tester has simple structure, convenient operation, accurate measurement, intuitive reading, and can directly calibrate the international standard rubber hardness value (IRHD) of the sample.


Specification:

Power: 220V 52Hz;  

Size: 180x150x400mm;  

Gross Weight: 15kg;  

Minimum measuring diameter: 4mm

 

Test

 

Diameters  mm

Force on Ball

Force on Foot

N

 

 

Test Range (IRHD)

Contact

N

Indenting

N

Total

N

Method N (Normal Test)

Ball: 2.5±0.01

Foot: 20±1

Hole: 6±1

 

0.30±0.02

 

 

5.40±0.01

 

5.70±0.03

 

8.3±1.5

 

30-85

Method H (high-hardness test)

Ball: 1.0±0.01

Foot: 20±1

Hole: 6±1

 

0.30±0.02

 

 

5.40±0.01

 

5.70±0.03

 

8.3±1.5

 

 

85-100

Method L (low-hardness test)

Ball: 5.0±0.01

Foot: 20±1

Hole: 6±1

 

0.30±0.02

 

 

5.40±0.01

 

5.70±0.03

 

8.3±1.5

 

 

10-35


Thickness:

1) Methods N and H

The standard test piece shall be 8mm to 10mm thick and shall be made up of layers of rubber, the thinnest of which shall not be less than 2mm thick. All surfaces shall be flat and parallel.

Non-standard test pieces may be either thicker or thinner, but not less than 4mm thick.

2) Method L

The standard test piece shall be 10mm to 15mm thick and shall be made up of layers of rubber, the thinnest of which shall not be less than 2mm thick. All surfaces shall be flat and parallel.

Non-standard test pieces may be either thicker or thinner, but not less than 6mm thick.


Principle:

The hardness test consist in measuring the difference between the depths of indentation of a ball into the rubber under a small contact force and a large (indenting) force. Then check the hardness tables and curves which are derived from the empirical relationship between indentation depth and hardness. 


Number of readings:

Make one measurement at each of a minimum of three different points distributed over the test piece and separated from each other by a minimum of 6mm, and take the median of the results when these are arranged in increasing order.

 

Expression of Results:

Express the hardness, to the nearest whole number, as the median of the individual measurements in international rubber hardness degrees, indicated by the degree sign (°) followed by:

1) Either the letter S indicating that the test piece was of the standard thickness or for tests on non-standard test pieces, the actual test piece thickness and the smaller lateral dimension Iin millimeters) (the result then being an apparent hardness);

2) The code-letter for the method, i.e. N for the normal test, H for the high-hardness test, L for the low-hardness test.

3) For tests on curved surfaces, the prefix letter C.

4) Example 1: 58°, SN;  Example 2: 16°, 8x25mm, L;  Example 3: 90°, CH

 

Standard Packing:

1. IRHD Hardness Tester   1 set

2. Round Work Table (for test flat sample)  1 Piece

3. Angle V-Shape Work Table    1 Piece

4. V-shape Work Table Support Frame   1 Piece

  Add
No. 56, Danshan Industrial Zone, Wenling City, China 317523
  Phone
0576-86011208 / 13524552810
  E-mail
sales@hiebp.com

All employees of EBP strives for development by quality and survival by service. We sincerely look forward to establishing a good and long-term cooperative relationship with you.

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