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Haohai Phenolic pre-insulated duct is another successful development after polyurethane pre-insulated duct was developed. Supported by a famous university and some overseas technology. Haohai R&D team used new phenolic process to make the duct has a high performance. The same goes to the polyurethane duct, it is also a modern heat insulate material. The core of the duct is phenolic foam, with surfaces both aluminum foils(Mode HPFA) or one side aluminum foil, the other side steel(Mode HPFAS). Phenolic is a high performance material in fireproofing, heat insulation, soundproofing, and energy saving. The working temperature range is from -50℃ to 150℃.

Compared to other material ducts, Haohai phenolic pre-insulated duct’s advantage is the excellent fireproof characteristics. All the specifications meet the A class fire retardancy of the National Standard. Haohai phenolic pre-insulated duct is made by continuous pressure process line, so it has a stable quality and high cost performance. That can easily meet the demands of lower price required by some projects.


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Take advantage of our unrivaled knowledge and experience, we offer you the best customization service.


In PU foam (OCF) industry, Haohai is one of the leading PU foam manufacturers in China.

They are all manufactured according to the strictest international standards. Our products have received favor from both domestic and foreign markets.
They are now widely exporting to 200 countries.
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