RESEARCH ON THE EFFECT OF THE CATION ON THE MECHANISM OF DRYING, INTUMESCENCE AND STABILITY OF AN INORGANIC INTUMESCENT COATING: PHASE III

Authors
  1. Langille, K.B.
  2. Nguyen, D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Bernt (J O) and Associates Ltd, Mississauga ONT (CAN)
Abstract
Soluble silicate coatings were prepared based on the Li/Na/K-silicate ternary system. These prepared samples were investigated in terms of hygroscopic nature, water resistance, stability (i.e. aging), thermolgravimetric properties, and intumescence. It was found that inclusion of lithium silicate in the ternary system dramatically decreased the water sensitivity, hygroscopic nature, and rate of aging (measured in terms of efflorescence). Unfortunately, it also decreases the degree of intumescence. However, in amounts less than 50wt.% lithium silicate the samples gave adequate fire protection. The efflorescence was found to be a result of a reaction between the OH in the silicate samples and CO2 in the atmosphere. It requires the presence of water vapour to proceed. In a dry environment, efflorescence does not occur.
Report Number
DREA-CR-90-426 — Contractor Report
Date of publication
15 May 1990
Number of Pages
34
DSTKIM No
91-00471
CANDIS No
67690
Format(s):
Hardcopy;Originator's fiche received by DSIS

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