DEVELOPMENT OF AN INTUMESCENT FIRE PROTECTIVE COATING SYSTEM BASED ON INORGANIC PHOSPHOSILICATE POWDERS

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Authors
  1. Langille, K.
  2. Nguyen, D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Bernt (J O) and Associates Ltd, Mississauga ONT (CAN)
Abstract
The R&D work described in the report focuses on the development of an environmentally stable intumescent inorganic powder in a latex binder system. A latex/silicone system was selected as the binder material to produce a coating which was both durable and easy to apply. Based on laboratory evaluations and small scale tests, the developed coating provided adequate fire protection. It has good water resistance and at the same time the intumescence of the powder was excellent. The most significant achievement in this program was the development of better intumescent powder formulations based on high lithium silicate content. The introduction of lithium silicate into potassium/sodium silicate in the powder form has enhanced several key properties of the intumescent powder system. First, the coating powder has good intumescence. Second, it has excellent long term stability in different environmental conditions. Third, it retains its intumescence even after exposure to high ambient temperatures of up to 90C. The best powder formulation was 40 wt% lithium silicate, 42.9 wt% potassium silicate and 17.2 wt% sodium silicate. Although the developed coating performed well in the small scale laboratory tests the performance in a large scale fire test was disappointing. TRUNCATED
Keywords
INTUMESCENT POWDERS;INORGANIC PHOSPHOSILICATE POWDERS;LITHIUM SILICATES
Report Number
DREA-CR-94-441 — Contractor Report (Final)
Date of publication
01 Aug 1994
Number of Pages
24
DSTKIM No
95-00966
CANDIS No
149070
Format(s):
Hardcopy;Document Image stored on Optical Disk

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