Saint Astier Lime Plasters and Finishes, NHL 3.5 – 55 lbs

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SKU: NHL3.5-55. Categories: , . Tag: .

Product Description

This moderately Hydraulic lime is used for laying or repointing brick, stone and terra cotta units even in extreme freeze-thaw climate cycles. It can be used to make scratch, brown and finish coats of exterior stucco or interior plaster.

NHL 3.5 must have 15-25% “free lime” content and no more than 30% which is responsible for self-healing mortars. The available free lime goes into solution during subsequent rains and then re-crystallizes across open fissures, similar to the process that occurs in historic pure lime mortars.

NHL maintains a hexagonal plate crystal structure which allows the plates to go in between each other for greater elasticity. In contrast, Ordinary Portland Cement (OPC) has a needle-like crystal structure which is brittle; buildings using OPC must incorporate numerous control joints to accommodate movement. Once properly installed and cured NHL 3.5 will reach over 750 p.s.i. in six months when blended with 2-1/2 parts clean, sharp and well-graded sand. ”