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What is the difference between SBS waterproof membrane and APP waterproof membrane?

December 19,2022

There are many types of waterproof materials, and different types have many models and specifications. For example, there are common asphalt concrete waterproof materials, polymer material cross-membrane waterproof materials, PVC waterproof materials, etc., and the waterproof membrane that everyone often says is 80% waterproof. It refers to the modified asphalt waterproof membrane, and the modified asphalt waterproof membrane is divided into two types: SBS and APP.

But I still find that many people don’t know how to distinguish these two waterproof membranes.

SBS waterproof membrane

The full name of SBS waterproof membrane is elastomer modified bitumen waterproof membrane. It is made of polyester felt, glass fiber felt or glass fiber enhanced polyester felt as the medium, butadiene-butadiene (SBS) thermosetting polyurethane elastomer as the asphalt. Clear modified materials, waterproof materials made of protective materials covered on both sides, are mostly used for moisture-proofing of the top surface of buildings or outside of underground garages.

SBS Features: The physical properties of polyester felt (polyester non-woven fabric) are used to improve corrosion resistance and durability, and its ductility and low temperature moisture resistance are higher than other products, especially at its reasonable temperature of minus 25 degrees Between zero and one hundred degrees, it has good anti-fatigue and anti-fiber properties.

APP waterproof material

The full name of APP waterproof material is plastic modified bitumen waterproof membrane. It also uses polyester cloth felt and glass fiber felt as the medium, but it uses organic chemical polymers such as random polypropylene or isoprene rubber polymer as the medium. Modified material of bitumen, waterproof material covered by insulating layers on both sides.

APP characteristics: Its ductility is also relatively good, especially in its modified material properties, so it is much better than other waterproof membranes in terms of UV resistance, and its softening point is above 150 degrees at high temperatures , so the characteristics of high temperature resistance are outstanding, but its minimum application temperature is minus 15 degrees, so the utilization rate in cold regions is not very wide.
The difference between SBS waterproof material and APP waterproof material
APP waterproof membrane has stronger resistance characteristics under long-term direct exposure to high temperature and ultraviolet light.
The SBS membrane has better drought resistance at ultra-low temperature and can avoid gaps caused by ultra-low temperature.

Therefore, SBS waterproof materials are widely used in severe cold regions, while APP waterproof materials are widely used in high-temperature southern regions, so don’t make mistakes when choosing waterproof materials.