When finishing a series of products, some special heat-resistant or non-combustible paint materials are used.
Heat resistance should be understood as the performance of the coating film against high temperature (but not open flame), that is, the coating film undergoes high temperature (but not open flame) without significant changes in appearance and without damage to its physical and mechanical properties; non-combustibility should be understood The performance of the paint film against open flames: that is, the paint film should not burn at all, or in the case of burning, the flame should be extinguished quickly, and the paint film itself should be able to prevent the flame from spreading.
Heat-resistant and non-combustible paint materials used for coating metal, furniture, wood, etc., in addition to heat resistance or non-combustibility, of course, should also have certain physical and mechanical properties.
According to different technical requirements, appropriate test methods should be selected.
It needs to be pointed out that the test of the adjusted fireproof paint and the test of the fireproof component of (protective) wood are different from the test of the metal special paint.
The fire retardant paint applied to the wood surface should form a non-combustible or difficult-to-burn paint film. In addition to high physical and mechanical properties (porosity of the coating film, bonding strength between the coating film and wood, etc.), the coating film should also have high fire resistance, that is, it is inconvenient to prevent the wood from being directly affected by fire and to prevent fire damage. Air enters the wood surface, which makes it difficult for the fire to spread, and at the same time increases the resistance of the wood to the action of fire. (Related Instruments: Thickness Gauge)
Depending on the application, fire retardant paint can be divided into two types: weather-resistant and non-weather-resistant.
It goes without saying that more stringent requirements should be put forward for weather-resistant fireproof paint, which is mainly the requirement to maintain its fireproof performance continuously when used under atmospheric conditions.
Wei Dingjin and Ta Niaobojin pointed out that before carrying out the special test of fire resistance, each new layer of fire retardant paint coating should be subjected to water resistance, moisture absorption, elasticity, impact strength, abrasion strength, and corrosion of metals. And a series of tests such as weather resistance. These preliminary tests are necessary because all fire retardant coatings can only prevent wood from burning while retaining their mechanical properties. (Related instrument: impact Tester)
Final conclusions about the suitability of fire retardant coatings can only be drawn after the specimens have been tested under conditions close to natural fire conditions. Therefore, the test must be carried out on a special wooden model or on several wooden strips that are sent to each other.
