A revised version of a document outlining the RAL Quality Association PCM’s quality testing program has been approved by the association's governing body and is now available on the association's website.
“Quality and Testing Specifications for Phase Change Materials,” also known as RAL-GZ 896, sets out the general principles for PCM. The document defines PCM, PCM composites, PCM objects and PCM systems; establishes performance requirements; and outlines the nature and scope of monitoring measures.
Improvements to RAL-GZ 896 include:
• Clearer structure and wording.
• Heat flow meter measurements are now permissible. This will make measuring larger PCM products much easier.
• Reduced testing frequency during cycling. The prior edition required testing the quality criteria at fixed intervals during cycling. The new edition recommends testing at intervals during cycling (to reduce the risk that cycling is continued until the end despite the sample has already failed) and the intervals are wider. These changes are designed to reduce the cost of testing.
• Segregation, an important criterion for salt hydrates especially, was approved as an additional quality requirement.
• Better explanation of monitoring.
“The now published document is a huge improvement” said Stefan Thomann, the association's managing director. “Over a period of two years, an expert task group added crucial requirements, new measurement methods and better explanation and guidance. The RAL Quality Mark as an independent proof of outstanding quality has become even more meaningful now.”