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Anhydrite adhesive test.
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[QUOTE="Ajax123, post: 635088, member: 12267"] Gypsum adhesives are not based on a dispersion mechanism. They are based on hemi hydrate calcium sulphate which when added to water hydrates to form gypsum. Gypsum needs to lose moisture in order to gain strength as the moisture sits at the interfaces between the interlocking gypsum crystals and effectively lubricates them. This reduces the amount of friction between crystals and reduces the compressive and flexural strength. The reason they work so well without primers is because there is no ettringite formation a the screed adhesive interface and the unprimed screed can pull the moisture out of the adhesive helping it to gain strength quickly. [/QUOTE]
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Anhydrite adhesive test.
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