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Quick Details

  • CAS No.: Mixed
  • Other Names: Polyurethane Swelling Waterproof Mastic Sealant
  • MF: Mixture
  • EINECS No.: 229-746-76701-15-1
  • Place of Origin: Beijing, China (Mainland)
  • Classification: Other Adhesives, One component
  • Main Raw Material: Polyurethane
  • Usage: Construction, Woodworking, Polyurethane Swelling Waterproof Mastic Sealant
  • Brand Name: LW
  • Model Number: LW-S40
  • Type: One Component
  • Product name: Polyurethane Swelling Waterproof Mastic Sealant
  • Feature: Swell with water
  • Color: Black and Grey
  • Packing: sausage
  • Application: Sealing Construction
  • Material: Polyuerthane
  • Certificate: ISO
  • Keywords: Best Price Waterproof Sealant
  • Shelf life: 9 Months

Packaging & Delivery

Packaging Details: 600ML per piece, 20pcs in a carton
Delivery Detail: 15 days after received the deposit

Polyurethane Swelling Waterproof Mastic Sealant

Model: LW-S40


Product Description




LW Water Swelling Waterproof 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.


Swelling sealant is a one component, polyurethane based, solvent free, hydroswelling mastic, supplied in cartridges and aluminium sausages, for the sealing of construction joints and around pipe penetrations, Swellseal Mastic cures and swells in the presence of moisture. Curing time depends on temperature and humidity conditions, i.e. curing time will reduce if RH and °C are higher. Swellseal Mastic will become firm in 24-36 hours. Performance is not affected by the curing time




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 Curing







Surface dry timeh≤





After  Curing



Tensile strengthMPa≥


Bonding strength to concret±MPa≥



Water expansion (room Temp, distilled water),%





The polyurethane swell seal sealant is 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



1.Sealing rough and smooth construction joints of in-situ cast concrete

2.Sealing joints between pre-cast segments(e.g. manholes, box culverts, cable ducts and pipes)

3.Sealing around steel H-beams.

4.Sealing between rough surfaces(e.g. slurry walls) and concrete slabs.

5.Bonding strip sealants to rough surfaces



Put the sausage in the empty tube of the calking gun and cut 1cm off the top of the sausage. Close the tube and install the nozzle. Cut the nozzle diagonally at the appropriate position


Swelling sealant is applied with a calking gun in an uninterrupted band(minimum 10mm wide and high), In the middle of the joint or prefab element. Concrete cover should be at least 7cm on both sides, in order to avoid cracks from the expansion pressure of swelling Swelling sealant. 



   1.Solvent free

   2.Swelling sealant can be applied to concrete, PVC, HDPE, STEEL, ect.

   3.The excellent filling and adhesion properties of the product provide a first line filling of cracks and voids, even on lightly humid, smooth or rough surfaces

   4.In contact with water Swellseal Mastic will expand to about 350% of it’s original volume

   5.Flexible system, which adapts to the irregular surface of the substrate

   6.Easy application with standard calking gun

   7.Durable: will exceed the construction’s life

   8.Has a good all-round chemical resistance and can resist to petroleum, mineral and vegetable oils and greases

   9.Swelling sealant is approved for contact with potable water



Save in ventilated, dry places, avoid direct sunlight; prohibit contacting with acid, alkali, oil, organic solvent, isolate heat source; do not press hardly. The sealant should be fully sealed to store.


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


LW Certifications



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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