FAQs

No. Waterborne coatings use water as a solvent. When stored below 0 degrees Celsius, the water in the formulation freezes, causing physical damage to the coating. Freezing may form ice crystals, which disrupt the emulsion structure of the polyurethane, leading to irreversible separation, thickening, or gelation.

Yes, the non-solvent polyurethane and water-based polyurethane can be used for indoor waterproofing applications. Non-solvent polyurethane is a high-solids, ultra-low VOC coating, especially suitable for areas with poor ventilation and sensitivity to odors or volatiles.

Sag-resistant PU has rheological properties. Rheology is the study of the behavior of materials during "flow" or "deformation" processes. There are several common "rheological behaviors" from the molecular level:
1) Shear thinning,This is the most common type of non - Newtonian behavior. It means that when you apply a shear force to the material (such as stirring, scraping, extruding), the viscosity of the material will decrease. ;
2) Thixotropy: Thixotropy is an "upgraded version" of shear thinning, with an additional dimension:
time. Its definition is: During the continuous shearing process, the viscosity of the material will gradually decrease with time; after stopping shearing, it can gradually recover the original viscosity. This ability of "temporarily becoming thin + reversibly recovering" is exactly thixotropy. Materials with good thixotropy can "flow smoothly" during construction, but can quickly recover viscosity to avoid "collapse" and "sagging". For the sag-resistant coating, it is easy to scrape and apply during construction, and does not sag when left standing, ensuring the bonding thickness.

Because moisture in the air can enter the container and cure the remaining coating inside.

Firstly, the isocyanate group in one - component polyurethane reacts with moisture to form a membrane. Two - component polyurethane has two parts: one part is isocyanate, and the other part is polyol or polyamine, and these two components react with each other to form a membrane. Secondly, due to the difference in the reaction mechanism, the sensitivity to atmospheric conditions is also different. For one - component PU, high moisture and temperature can increase the reaction speed. In contrast, two - component PU has better storage stability, and its reaction speed is hardly affected by moisture.

It is suitable for various type of structures and substrates, it can form seamless membrane without joint (seams and joints are the most vulnerable to leakage), and is beneficial for complex structures. The liquid coatings has various functions, sucha as flexible, high strength, excellent abrasion resistance, high load bearing property, and breathable capability, etc.

Four primary issues commonly lead to mold, mildew, rising damp, and efflorescence: Mold caused by inadequate ventilation Mold resulting from internal condensation Mold induced by driving rain or roof leaks Rising damp and efflorescence attributed to salt contamination

For non-porous substrates such as metal and glass, silicone-based sealants are recommended. For porous substrates like concrete, bricks, and masonry, polyurethane sealants are the preferred choice. In applications requiring broad adhesion compatibility (e.g., window installations), silane-modified polymer sealants are uniquely suitable due to their versatile bonding properties. For joints that are too wide for conventional sealants or demand enhanced waterproofing, consider joint tapes, swellable profiles, waterbars, or injection hose systems—selection should be tailored to the project’s specific requirements.

Flashing materials are key components in building waterproofing engineering, used to treat special parts such as corners and gaps. Their core function is to prevent water seepage from building joints, especially for waterproof sealing of roofs, walls, pipes, and other components. Flashing materials: Include waterproof membranes、tapes, coatings, metal sheets, sealants, etc.

1. POLYURETHANE FOAM RESINS Polyurethane foaming resins are designed to expand with water to temporarily block the passage of water through the crack or void .
2. POLYURETHANE RESINS Polyurethane resins are hydrophobic, flexible and used for the non-structural injection sealing and waterproofing of voids, cracks and joints. Their low viscosity allows good penetration into the concrete structure to seal the leaks and achieve a durable elastic seal.
3. ACRYLATE RESINS Acrylate resins are hydrophilic, very flexible and used for non-structural injections of cracks, joints and voids, including for injection hose systems, compartment systems and area (e.g. Grid and Curtain) injection works.
4. EPOXY RESINS Epoxy resins have relatively high tensile and compressive strengths in relation to concrete, they are generally regarded as ‘rigid’ materials and widely used for structural repairs by injections of cracks and voids in load bearing reinforced concrete structures or elements

Injection is a common method used to repair and waterproof concrete structures. It is also used to consolidate and stabilize ground before future structures are erected (pre-excavation grouting) and to stop water and consolidate ground in existing underground structures (post-injection).

6 months unopened for VAE emulsion products; 12 months unopened for RDP products;

Production: 7–10 days; sea freight to South East Asia: 7-10 days; Europe/Americas: ~25–35 days; LatinAmerica: ~20-45 days, CFR, DDP is both available for urgent orders.

Hongshi has Technical Service team in Shanghai Technical Center. We have technical engineers who can provide related support according to different standard & application requirement by the formulation.

Yes. We can arrange free sample, 300g per for RDP and 500g for VAE emulsion.