• AENOR - Spain - .
• CEN - Europe - .
• ASTM - USA - .
• BSI - Great Britain - .
• AFNOR - France - .
• DIN - Germany - .
• UNI - Italy - .

• ENAC - Spanish National Accreditation Entity -

• LOM - Madariaga Official Laboratory - .
• LOEMCO - Official Building Material Testing Laboratory - .