TAll our prestressed steel complies with the specifications stipulated in:
ASTM A421, BS 5896, ISO 6934-2, UNE 36094:1997 and pR EN 10138, and are tested according to the following standards:ASTM (A370, E30, E,328) - BS (ISO 15630-3) – ISO (ISO 6934, ISO 1099:2006, ISO 6892-1:2009, ISO 7801:1984) – UNE (ISO 15630-3), which are summarised below
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At Pretensados del Norte, S.L. we have equipped our laboratories with ultra-modern technology to guarantee the quality of our materials at all times. This has led us to be recognised with the award of the certificate for Prestressed Steel products for active reinforcement (N seal). To attain the certificate we conducted many tests in the laboratories of the Spanish Ministry of Industry.

Our laboratory is fully equipped to conduct:
- Tensile tests with extensometry
- Bending tests
- Stress relief tests
(all according to the appropriate standards)