water of hydration


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water of hydration

[′wȯd·ər əv hī′drā·shən]
(chemistry)
Water present in a definite amount and attached to a compound to form a hydrate; can be removed, as by heating, without altering the composition of the compound. Also known as water of crystallization.
References in periodicals archive ?
The alumina trihydrate and magnesium hydroxide both act by releasing their water of hydration which cools the flame and acts as a heat sink to pull heat away from the flame front.
It retards combustion by absorbing heat endothermically, cooling the substrate, promoting char formation, and ultimately decomposing to release its water of hydration, similar to alumina trihydrate (ATH).
A spokesman says these flame retardants will be joined by another antimony replacement later this year--a magnesium hydroxide that releases its water of hydration (like ATH) at high enough temperature to be useful in a variety of engineering thermoplastics.