What is a 7n concrete block?

A 7n concrete block is defined by a minimum compressive strength of around 7 newtons per square millimetre (7 N/mm²). It meets BS EN 771-3 standards and comes in solid or hollow forms, with typical dimensions 440 mm long by 215 mm high, and thicknesses of 75 mm, 100 mm or 140 mm.

What are the typical weights of 7n concrete blocks?

Weight varies with thickness and density. For example, a solid dense block 440 × 215 × 100 mm weighs around 18–20 kg.

Are 7n concrete blocks different from 7.3 n blocks?

In practice, “7n” and “7.3 n” descriptions refer to similar compressive strength - 7.3 N/mm² is a more precise figure found in many dense concrete blocks. This minor difference has minimal impact on suitability, unless project specs call for exact strength values.

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7n concrete blocks

7n concrete blocks

7n concrete blocks (also written as 7 newton blocks or 7 N/mm² blocks) are masonry units with a minimum compressive strength of approximately 7 N/mm² (or 7.3 N/mm² in modern formulations). Builders commonly use 7.3n blocks in solid or cavity wall ...

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