Specification Of Materials
 

The BelmaFlex joint and all other standard products are made of HDPE  material in accordance
with DIN 8075 – identical to the material used in a jacket pipe for pre-insulated district heating
systems. It has been documented that the durability of this material is at least 50 years.

The properties of the applied HDPE material used in the manufacture of joints and other standard
products are as follows:

Density:                               >   940 KG/M3
Yield stress                          >     19 N/mm2
Max load
during transport                             3 N/mm2
Continually                                 0,5 N/mm2

CLT (EN253)                      > 1500 hours

Thermal qualities:
Expansion coefficient       2  10-4  `C-1
Thermal conductivity        0,43 W/m`C
Melt Index                       0,3 – 0,8 g/10 min.

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