Rete CK155 is certified ETAG 004 and it has a 155 g/sq.m. basis weight and a 3,5×4,5 mm mesh. It is applied in thermal coatings to avoid any cracks in the external facades. It is made of glass yarns produced by Vertex Saint-Gobain and it is subsequently impregnated with anti-alkaline resins S.B.R. which give it a strong resistance to the cement alkali.

It is produced according to DIN EN ISO 13934-1, DIN 53854 and DIN53857. It is certified ETAG 004 (MA39-VFA certification 2002-2001-01-02) this means that it meets the conditions laid down by the European Commission, thus being suitable for use in construction industry. The thermal insulation systems since May 2013 has as a reference the certification ETAG 004. The ETAG 004 guide was developed by EOTA (European Organization for Technical Approvals) for the European Community.