The work sheet DVGW-VP406 has been issued by DVGW and comes with the approvals EN 549 or EN 682 for the gas field in Germany. The work sheet consists in two parts: the first, which is already compulsory in addition to the certifications EN 549 and EN 682, provides an identification test of the elastomeric compound (with the method IR), and is carried out on our materials after the renewal of the approvals which are due to expire (therefore you can find the corresponding reference only on the “new” certificates issued by DVGW). The second one is still optional, and provides the following tests: ozone resistance, strength relaxation test, compression set at the conditions of 3000h/70°C, with value registration every 1000h. This test has the clear purpose of evaluate the material transformation in a significant lapse of time. The maximum admitted compression set value has not been defined yet. Our compound TEC N31-70 disposes of the complete approval according to DVGW-VP406 (annually checked by DVGW with whom we drew up a surveillance contract) and of others approval for gas according to EN 549:1994 class B2 H3 (for gas at temperatures from -20 to +80°C) and EN682:2001. In the material section you will find the technical data sheet of the compound and, on request , we can provide you the above mentioned certificates.
04/09/2006
Approvals according to the work sheet DVGW-VP406