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11036 Low Temperature Mechanical Properties of Passive Fire Protective Coatings

Picture for 11036 Low Temperature Mechanical Properties of Passive Fire Protective Coatings
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This paper explores room temperature and low temperature properties of epoxy intumescent PFP coatings. Tensile properties and adhesion values down to –40°C were measured and will be discussed. Comparison between flexible, tough PFP coatings and hard, brittle PFP coatings will be presented.

Product Number: 51300-11036-SG
ISBN: 2011 11036 CP
Author: Paul P. Greigger and Jonathan M. Hills
Publication Date: 2011
Industry: Coatings and Linings
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Passive Fire Protective coatings (PFP) are applied at much higher thickness than most regular paints. Typical thicknesses are in the range of 0.1 inch to 0.75 inch (2.5-19mm). In many ways, it is best to think of PFP materials as composite plastics rather than as coatings. As such, physical properties that are important with a material applied at five mils may not be relevant to a coating applied at 100 times that thickness. Properties of thin film coatings that are considered attributes may not allow the PFP to cope with the rigors of in-service conditions. Vibration, flexing of steel members and rapidly changing temperatures can negatively impact thick film coatings. This paper explores the room temperature and low temperature properties of epoxy intumescent PFP coatings. Tensile properties and adhesion values at room temperature down to –40°C have been measured and will be discussed. A comparison between flexible, tough PFP coatings and hard, brittle PFP coatings based on apparent glass transition temperatures, adhesion, tensile strength, and elongation will be presented.

Key words: Passive fire protection, intumescent, low temperature, tensile strength, adhesion.

Passive Fire Protective coatings (PFP) are applied at much higher thickness than most regular paints. Typical thicknesses are in the range of 0.1 inch to 0.75 inch (2.5-19mm). In many ways, it is best to think of PFP materials as composite plastics rather than as coatings. As such, physical properties that are important with a material applied at five mils may not be relevant to a coating applied at 100 times that thickness. Properties of thin film coatings that are considered attributes may not allow the PFP to cope with the rigors of in-service conditions. Vibration, flexing of steel members and rapidly changing temperatures can negatively impact thick film coatings. This paper explores the room temperature and low temperature properties of epoxy intumescent PFP coatings. Tensile properties and adhesion values at room temperature down to –40°C have been measured and will be discussed. A comparison between flexible, tough PFP coatings and hard, brittle PFP coatings based on apparent glass transition temperatures, adhesion, tensile strength, and elongation will be presented.

Key words: Passive fire protection, intumescent, low temperature, tensile strength, adhesion.

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