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Quick Details

  • CAS No.: Mixed
  • Other Names: Polyurethane Swell Seal Mastic Sealant
  • MF: Mixture
  • EINECS No.: 229-746-76701-15-1
  • Place of Origin: Beijing, China (Mainland)
  • Classification: Other Adhesives
  • Main Raw Material: Polyurethane
  • Usage: Construction, Transportation, Woodworking, Swell Seal Mastic Sealant
  • Brand Name: LW
  • Model Number: LW-S40
  • Type: Swell Seal Mastic Sealant
  • Product name: Polyurethane Swell Seal Mastic Sealant
  • KeyWord: Swellable Mastic
  • Feature: Swell Meet With Water
  • Material: Polyurethane
  • Certificate: ISO9001,MSDS, Test Report etc.
  • Specification: 600mL, 310mL
  • Color: Black and Grey,white
  • Packing: Sausage
  • Shelf life: 12 Months
  • Application: Polyurethane Swell Adhesive

Packaging & Delivery

Packaging Details 600ML/Bar (20 Branch/Box); 310 mL/Bar (24 Teams/Box).
Delivery Time Within 10 Days after Receiving the Payment.

High Strength Polyurethane PU Swell Seal Mastic Sealant With Best Price




Product Description




LW swelling mastic sealant is a kind of solvent-free, single component and curing at room temperature sealant. It shows in paste condition,can squeeze out or daub when operating construction. It will not flow to embed vertical joint and top joint because of the resistance to drop. It presents rubber-like state and is elastic after curing. It can strongly adhere to metal, rubber, wood, cement components, ceramic, glass and so on. this kind of swell sealing mastic is used to fill the void (hole, joint, joint, etc.), have both bonding and sealing functions.



1. Strong adaptability

2. Good wear-resisting performance 

3. High mechanical strength

4. Good Bonding performance 

5. Good elasticity, has excellent resilience, and can be used for dynamic joint

6. Good flexibility in low temperature

7. Good weathering resistance, service life can reach as long as 15 ~ 20 years

8. Good oil resistance 

9. Resistance to biological aging 

10.  Executive standard : DB11/581-2008


Technical Datasheet 









Before solidification







Surface dry timeh≤





After solidification



Tensile strengthMPa≥


Bonding strength to concret±MPa≥



Water expansion (room Temp, distilled water),%




Applied in  structural waterproofing ,and  Fixing of cross section water stop or LW preventive injection hose.



  Construction joint

  Pipeline and concrete iron in wall or cement board

  Surrounding the concrete iron or joint

  Inner joint of cable



  Preventive injection hose: type LWRI, I and II

  Cross section of water stop



Place in ventilated, dry places, avoid direct sunlight; prohibit contacting with acid, alkali, 

oil, organic solvent, isolate heat source; do not press hardly. Should be sealed save.


Company Information

As an member of Chemical Grouting Sub-Committee, Chinese Hydraulic Engineering Society, the Director Member of Waterproof Sub-Committee and China Construction Industry Association.LANGWEI Conchem is a fast growing international manufacturer of construction chemicals with plants in Beijing, China. The company is specialized in preventative and remedial waterproofing products. 

Preventative waterproofing products are wildly used during new construction and are usually installed by the general contractor. Examples are bentonite strips, hydrophilic mastics and rubbers, which swell in contact with water and hence block water ingress, injection hoses, which can be injected at a later stage to block water and finally cementitious coatings for basement waterproofing and elastomeric membranes for tanks and roofs.

Remedial waterproofing products are mostly used when major (or minor) water leaks happen at a later stage and are usually applied by specialist applicators. Remedial waterproofing products are also often used during construction of tunnels and other underground constructions to prevent infiltrating water from hindering the normal progress of the works. Examples are injection resins based on Polyurethanes (both 1C and 2C) and Poly-acrylates. These products are also used for Soil and Rock Stabilization, together with Organo-minerals.

LANGWEI Conchem also manufactures a series of products for the Protection and Repair of reinforced Concrete. Examples are cementitious grouts and mortars, epoxy injection resins, carbon fibre laminates and epoxy glues.

Founded in 2004, Beijing Long Way Times Science & Technology Co., Ltd. has been committed to the research and development of new type environmentally friendly building materials as well as the innovation of service and construction process. 
Our company is the member of Chemical Grouting Sub-Committee, Chinese Hydraulic Engineering Society, the Director Member of Waterproof Sub-Committee and China Construction Industry Association. The products developed by Langwei include AC-II liquid acrylate grouting materials (Patent No.20********2.7), MMA (Methyl Methacrylate) grouting materials, permeable crystalline waterproofing materials, polyurethane grouting materials, epoxy grouting materials and water-swelling water-proofing gel. Our products are of top quality among domestic similar products.

As a ODM, we devoted ourselves  to waterproof inductry and got a lot of glories from government, we promise your requirment of the waterproof product top quality and best price is top level.



Why choose us ?

-The member of Architectural Society of China

-Best quality: LW joint sealant has been applied in the subway and hydraulic power project, 

have taken excellent application effect.

-Cheapest price: factory price, send inquiry for quotation

-Good after service: guidance for your project, make sure performence well






Packaging & Shipping



LangWei Conchem is specialized in preventative and remedial waterproofing products, which are mostly used in Balcony waterproofing, car part decks, concrete repair and protection, facade waterproofing, flooring systems, injection equipments, packers & accessories, preventative waterproofing, remedial waterproofing, roof waterproofing, sewer rehabilitation, soil injections, tunel applications and so on.



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