Cost-effective: Our panels are reasonably priced for residential as well as commercial solutions. Haohai wall PU FOAM sandwich panels can save on energy bills and provide you with well-insulated and structurally sound building.
These wall panels are with ready made hard skeletons in them Self-Supporting and Framed Panels – metal, ferrocement (concrete)Our Wall Sandwich Panels offer difficult solution for insulation and give the best take of its R-Value. They insulate buildings so that they stay cool in summer and warm in winter, without the need for energy-intensive heating and cooling systems.
Furthermore, our panels are able to provide immense structural support and reduce risks of damage in the case of high winds or from other possible natural disasters. Rest assured that your building will be well insulated and structurally integrity can rest rather easy with these Haohai wall PU FOAM sandwich panels.
The decision to utilize Haohai wall sandwich panels is the strength of choice, and your construction material will have a long life. Manufactured from only the finest materials, our panels are built to be durable and long-lasting, preserving the integrity of your building over years of use.

Superior to traditional materials, our wall sandwich panels are rot-proof, pest-proof and mold resistant; this makes them a great choice for both residential and commercial constructions. Haohai wall sandwich panels have you secure in the knowledge your building will be there for many more years.

Our panel’s sizes and thickness are versatile, able to adapt for different types of projects. Whether you need panels for interior walls, exterior walls or roofing, Trespa has the solution to meet your needs.

At Haohai, we know that every project is special. That is why we have custom options to serve your specific interests. If you are looking for custom-sized, -colored or –shaped panels—we have you covered.
Our main products are Duct Panel, PU foam, stonefix adhesive foam, polystyrol adhesive foam, multipurpose spray wall sandwich and personal care, home care, car care aerosols. We are now creating OEM products for well-known corporations around the world.
All of our products are manufactured using the finest quality materials They outperform their competitors when it comes to durability and performance They are highly regarded by both wall sandwich
Our customer service is thorough and professional We have a highly skilled customer service team who can resolve customer's problem effectively; the well-known customer service system as well as technical support help us offer the wall sandwich service to our customers
Haohai founded in the month of wall sandwich, has maintained its fast and steady growth rate. The company has also been designated an "Advanced Enterprise and Civilized Unit in Technology Innovation" and has received ISO9001:2015 certification for its quality system. Our products are of high quality because we have a high-quality quality management system and the most advanced equipment and a highly skilled staff.