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3701 Lite Mortar contains carefully selected polymers, portland cement and light weight aggregates. 3701 Lite Mortar contains no respirable silica sand and does not require the use of latex admix. You will only need to add water to produce thick bed mortar or a vertical repair mortar/screed. 3701 Lite Mortar weighs half the amount of a conventional thick bed mortar and is easy to mix / apply.