FAQ IRHD
Overview:
What means the short form of IRHD?
Which parts you can measure with IRHD?
Which hardness type is suitable for what application?
How big is the indentation way?
Which shape has the indentors?
Which IRHD methods are available?
Which material thickness is required?
What should you consider regarding the measuring time?
How often should you re-calibrate an IRHD System?
How can I avoid errors while measuring?
Where is the serial number located on the controller and IRHD measuring head?
Where can I find the software version?
Where can I find the firmware version?
Which information do I need for trouble shooting?
What means the short form of IRHD?
IRHD is the short form of "International Rubber Hardness Degree".
IRHD is a measuring device to measure the hardness of rubber and plastics.
What means hardness?
Hardness is the resistance against the indentation of a known geometrical indentor with determined force into a sample.
What means IRHD?
IRHD is a material parameter for elastomers, foams and plastics.
Which parts you can measure with IRHD?
The range is from silicones through elastomers to plastics. Important is the material thickness and material width.
Which hardness type is suitable for what application?
| IRHD M (MICRO): | O-Rings, soft rubber, elastomers, natural rubber… |
| IRHD N: | Soft rubber, elastomers, natural rubber… |
| IRHD L: | Foams |
| IRHD H: | Plastics |
How big is the indentation way?
According to the hardness type.
| IRHD M (MICRO): | 0,3 mm |
| IRHD N: | 1,8 mm |
| IRHD L: | 1,1….0,099 mm |
| IRHD H: | 0,44 mm |
Which shape has the indentors?
According to the hardness type.
| IRHD M (MICRO): | Ball 0,395 mm |
| IRHD N: | Ball 2,5 mm |
| IRHD L: | Ball 5,0 mm |
| IRHD H: | Ball 1,0 mm |
Which forces are present?
According to the hardness type.
| IRHD M (MICRO): | Preload 8,3 mN, main load 145 mN, Total load 153,3 mN |
| IRHD N: | Preload 0,3 N, main load 5,4 N, Total load 5,7 N |
| IRHD L: | Preload 0,3 N, main load 5,4 N, Total load 5,7 N |
| IRHD H: | Preload 0,3 N, main load 5,4 N, Total load 5,7 N |
IRHD systems has dead weights (no spring!). The weights produce the required forces. Each indentation way has a corresponding hardness.
Which IRHD methods are available?
| IRHD M (MICRO): | 35…. 85 (95) IRHD |
| IRHD N: | 35… .85 (95) IRHD |
| IRHD L: | 10…..35 IRHD |
| IRHD H: | 85…100 IRHD |
Which material thickness is required?
According to the hardness type.
| IRHD M (MICRO): | 1…5 (from 0,6 mm) |
| IRHD N: | 8…10 mm |
| IRHD L: | 10…15 mm |
| IRHD H: | 8…10 mm |
What should you consider regarding the measuring time?
The measuring time of 30 s is determined in the ISO 48 standard.
How often should you re-calibrate an IRHD System?
The calibration of a IRHD system is described in the standard ISO 18898. The minimum requirements of the measuring instruments are described in the ISO 18898. At a calibration the geometry of the indentor and pressure foot, spring forces and depth of indentation will be checked.
We recommend an annual calibration.
How can I avoid errors while measuring?
- While measuring it is forbidden to move the sample. Otherwise you can damage the indentor.
- Before measuring you have to check whether the IRHD type is suitable to measure the material.
- The ambient temperature, the sample temperature and the temperature of the IRHD system should be 23 °C.
- Don`t use thinner materials than described in the standard.
- The surface of the sample must be clean and flat. The sample must have two parallel surfaces.
- When you measure O-Rings please use the O-Ring Center Device. Cord diameters from 0,6 bis 8,0 mm can be positioned exactly at the highest point of the O-Ring.
- If you make more than one measurement per sample you can use the measuring position only one time. That means after each measurement you have to move the sample.
- If the IRHD system is used improper you have to check it or send it back for calibration.
How do I ship an IRHD System?
Please ship the IRHD system only in the original packaging. You can order the packaging at Hildebrand. The transport lock must be activated.
Where is the serial number located on the controller and IRHD measuring head?
Controller:
On the rear side. Beginning with CON…
IRHD measuring head:
| MICRO: | On the left side |
| MACRO: | On the right side |
Where can I find the software version?
In the IRHD software.
Where can I find the firmware version?
How do I install the cables?
MICRO IRHD:
Which information do I need for trouble shooting?
- Serial number of the measuring head
- Serial number of the Controller
- Software version for example 2.51
- IRHD Controller I or II
- Firmware version for example 1.12