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INSULITE STANDARD Medium Density Aggregate Blocks Insulite blocks are the perfect versatile all-round building blocks. These medium density aggregate blocks consist of up to 90% recycled raw materials, making them among the most environmentally friendly and sustainable building blocks available. Insulite blocks are manufactured to BS EN 771-3 and are ISO 9001 Quality Assured, ISO 14001 Environmentally Certified and hold BES 6001 Responsible Sourcing certification.