PAS 670:2021

This standard PAS 670:2021 Magnesium oxide-based boards for use in buildings. Specification is classified in these ICS categories:

• 71.060.20 Oxides
• 77.150.20 Magnesium products

This PAS specifies requirements for flat sheet building boards manufactured using magnesium oxychloride or magnesium oxysulfate for the purpose of partitioning or internal and external lining of buildings, including the following characteristics:

1. dimensions and tolerances (see Clause 7);

2. physical requirements and characteristics (see Clause 8);

3. durability (see Clause 9);

4. release of dangerous substances (see Clause 10);

5. moisture movement (see Clause 11);

6. reaction to fire (see Clause 12);

7. performance in a humid environment (see Clause 13);

8. verification of quality management system (QMS), factory production control (FPC) and consignment inspection (see Clause 14); and

9. product traceability (see Clause 15).

This PAS is intended for use by manufacturers, distributors and third-party verifiers, and sets out the requirements for how boards should be tested and verified as fit for purpose.

The PAS is not an installation guide.

The PAS is not applicable to the use of boards as flooring, sarking and roofing.

The PAS is not applicable to specific applications for which additional testing is required to demonstrate fitness for intended purpose, e.g. use of boards for racking resistance and as direct render substrates.