Certification Certification Concrete Blocks Concrete Blocks available in a range of sizes. Certified product and conforms to Harmonized European Standard IS EN 771-3:2011 +A1:2015. A) 440 x 100 x 215 Click Here: Declaration Of Performance B) 440 x 215 x 215 Click Here: Declaration Of Performance C) 440 x 215 x 140 Click Here: Declaration Of Performance Pre-Stressed Lintels 100mm x 65mm x2400mm Click Here: Declaration Of Performance 150mm x 65mm x 1350mm Click Here: Declaration Of Performance 100mm x 150mm x 2400mm Click Here: Declaration Of Performance Window Cills Window Cills are available in 3 types:250mm wide x 100mm Face250mmwide x 50mm Face400mm wide x 100mm Face Lightweight Thermal Blocks 440mm x 215mm x 100mm Click Here: Declaration Of Performance Brochure Lightweight Blocks Click Here: Brochure NSAI Certificate Click Here: NSAI Certificate