What kind of flame retardant grades are flame-retardant high temperature resistant air ducts divided
The flame retardant grades are divided into the following categories:
1, HB: The lowest flame retardant grade in the UL94 standard. It is required that for samples with a thickness of 3 to 13 mm, the burning rate is less than 40 mm per minute; for samples with a thickness of less than 3 mm, the burning rate is less than 70 mm per minute; or extinguished before the 100 mm mark.
2, V-2: After the sample is subjected to two 10-second burning tests, the flame is extinguished within 60 seconds, and burning materials may fall.
3, V-1: After the sample is subjected to two 10-second combustion tests, the flame is extinguished within 60 seconds, and no burning material can fall.
4, V-0: After the sample is subjected to two 10-second combustion tests, the flame is extinguished within 30 seconds, and no burning material can fall.
Through the above understanding of the flame retardant grade, everyone should be clear that the flame retardant high temperature resistant air duct is not burnt, but the open flame will extinguish itself within a certain period of time. Many customers after purchasing high-temperature air ducts respond 'Isn't your high-temperature air duct flame-retardant? Why can it burn?' This is the problem of the flame-retardant grade mentioned above. The higher the flame-retardant grade, such as the high temperature resistance of flame-retardant VO Ventilation hose, after burning with a lighter, the flame will self-extinguish within 30. This is the highest flame retardant grade. Basically all ducts are flame retardant VO and V1, because most of them are resistant to high temperatures. Air ducts are used in environments with temperature requirements, so there must be certain requirements for flame retardancy. If air ducts are not flame-retardant, they will often cause safety hazards.
So, what are the commonly used flame-retardant and high-temperature air ducts on the market?
1. Aluminum foil ventilation hose
The aluminum foil ventilation hose is made of single or double layer aluminum foil, aluminum foil and glass fiber cloth with elastic steel wire in the temperature of 150 degrees
2. Nylon cloth telescopic duct
100 degrees temperature resistance, made of nylon cloth with steel wire inside, also called three-proof cloth duct or canvas ventilation hose.
3. Red silicone glass cloth duct
The high temperature silicone hose made of silicone rubber and glass fiber with steel wire is also called red high temperature resistant hose.
4. Cloth telescopic duct
is a high temperature resistant telescopic ventilation hose made of glass fiber coated cloth and a high temperature cloth sandwiched by galvanized steel tape.
All of the above are flame-retardant high-temperature resistant air ducts, which are divided into different flame-retardant grades and temperature resistance ranges and different application scenarios. Flame-retardant high-temperature resistant air ducts are mainly used for occasions that require flame retardancy; used for solids such as dust and powder End and fiber; used in gaseous media such as steam and smoke; used in industrial dust removal and extraction stations, flue gas emissions, blast furnace exhaust gas emissions and welding gas emissions; high-temperature induced draft fan equipment exhaust gas exhaust, etc.
Hangzhou Haikuo has many years of experience in the development and production of high temperature resistant air ducts and high temperature hoses. The high temperature resistant telescopic air duct series have a complete range of products and specifications. The production scale is large, the stocking quantity is sufficient, the delivery cycle is fast, and the price advantage is obvious. , Is lower than the dealers or trading companies on the market, and enjoys a reputation among domestic counterparts. It meets the high-temperature and fire-resistant grade certification, and can be safely used in work environments that require flame retardancy.