Vermiculite and perlite are both lightweight concrete aggregates with many similar values such as insulation properties and the fact that they are both light weight. Perlite is a lightweight, hard material (like a small pebble) that is not really absorbent. Vermiculite is also lightweight but has a somewhat spongy texture which lends to it being very absorbent.

When working vermiculite concrete with a trowel, it feels spongy and compresses slightly. This compression gives a better consolidation to the concrete which makes a stronger finished product. Perlite concrete does not consolidate as well because the perlite aggregate is harder and larger than vermiculite and does not compress like vermiculite when being placed.

Because of this slightly better consolidation, as a finished product, the vermiculite concrete can be to be a little stronger than the perlite concrete. There is less honeycombing or voids left in the vermiculite concrete. Less honeycombing means more strength.

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