BOSLAI Polyurethane Sealant is a single-component, moisture curing elastic sealing material. It is ready to use with no mixing required simply extruded via a caulking gun or applied directly by trowel. Once cured, it forms a highly extensible and strongly adhesive seal that accommodates joint movement and deformation. The product exhibits excellent adhesion to substrates such as concrete, metal, and stone, and is suitable for sealing and waterproofing applications in building expansion joints, curtain wall joints, and underground structures.
Single-component / Eco Friendly / OEM Accepted / UV Resistant
APPLICATION RANGE – Polyurethane Sealant
BOSLAI Polyurethane Sealant is suitable for sealing expansion joints, movement joints, and construction joints in concrete, masonry, and metal structures. Typical applications include building facades, curtain wall joints, window and door perimeters, bridge decks, tunnel segments, parking decks, and underground structures. It is designed for both indoor and outdoor use on substrates such as concrete, stone, metal, and ceramic.
PACKAGING & COVERAGE – Polyurethane Sealant
| Specification: | 750g/tube |
| Appearance: | Single component, black paste. |
| Warranty period: | More than 15 years. |
| Shelf Life: | 1 Year |
TECHNICAL DATA – Polyurethane Sealant
| Item | Data |
| Appearance | The sample is a fine, uniform paste, free of bubbles, skinning, or gel. |
| Flowability – Sag (N-type) (mm) | 0 |
| Tack-free Time (h) | 9 |
| Extrudability (mL/min) | 224 |
| Tensile Modulus at 23°C (MPa) | 0.55 |
| Tensile Modulus at −20°C (MPa) | 0.84 |
| Elastic Recovery (%) | 75 |
| Adhesion at Specified Elongation | All three specimens show no failure |
| Adhesion at Specified Elongation After Water Immersion | All three specimens show no failure |
| Adhesion After Cold Pull–Hot Compression | All three specimens show no failure |
| Mass Loss (%) | 3.7 |
| Density (g/cm³) | 1.37 |
Download BOSLAI Polyurethane Sealant TDS (PDF)
TDS_BOSLAI Polyurethane Sealant.pdf
Key Advantages of BOSLAI Polyurethane Sealant
BOSLAI Polyurethane sealant offers 5 core advantages:
- Elasticity & Recovery: Cures to a highly elastic rubber that accommodates dynamic joint movement (e.g., expansion and bridge joints). Withstands repeated tension, compression, and shear without cracking or debonding.
- Low-Temp Performance: Remains flexible down to even -40℃, preventing embrittlement in cold-climate applications.
- Strong Adhesion & Compatibility: Bonds well to concrete, metal, wood, and plastics (e.g., PVC, ABS) without primer. Low surface tension enables micro-pore penetration, enhancing mechanical anchoring.
- Weather & Chemical Resistance: Excellent UV and ozone resistance; outdoor service life up to 15~20 years with better color stability than silicones. Resists water, oils, and mild acids/alkalis.
- Ease of Application: Single-component grades cure via moisture; two-component grades offer faster cure. Both suit varied site requirements.
- Surface Finishability: Cured film resists traffic abrasion and puncture, and accepts paint and sanding for decoration or maintenance.
Packaging, MOQ, and Export Shipping
Standard packaging is 500g bags or in 10kg, 20kg pails. MOQ is 200 kg if you have a freight forwarder in China; otherwise the minimum shipment follows your shipping line’s requirement (around 2 CBM). Free samples are available so you can verify adhesion and film quality on your actual substrate before ordering.
Lead time is 4 days for standard stock; OEM orders take 7 days depending on packaging design. We ship with CIF, FOB, EXW with complete export documentation — TDS, MSDS, and Non-dangerous goods classification for smooth customs clearance.
Customization Service
Customization is available for packaging design in different languages, and package sizes.
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FAQ
Q: What is polyurethane sealant used for?
It seals and waterproofs expansion joints, curtain wall joints, window and door perimeters, bridge decks, tunnels, and parking decks. It bonds strongly to concrete, metal, stone, and masonry, both indoors and outdoors.
Q: Polyurethane sealant or silicone — which is better for concrete joints?
Polyurethane. It adheres much better to porous concrete without primer, resists abrasion and traffic, and is paintable. Silicone suits glass and glazing; for concrete expansion joints, polyurethane is the professional choice.
Q: Is polyurethane sealant waterproof and suitable for outdoor use?
Yes. Once cured, it forms an elastic, watertight seal with excellent UV and ozone resistance. It stays flexible even at -40°C, with an outdoor service life of up to 15–20 years.
Q: How long does polyurethane sealant take to cure?
Initial cure takes about 24 hours, and full cure takes up to 7 days depending on temperature and humidity. Keep the joint free from water and traffic during the first 24 hours.
Q: Do you offer OEM service and free samples?
Yes. As a polyurethane sealant manufacturer in China, BOSLAI supports OEM and private-label production — custom packaging, colors, and your own brand. Free samples are available so you can test quality before bulk orders.
Q: What surfaces does it bond to — is a primer needed?
It bonds well to concrete, metal, wood, stone, and plastics such as PVC and ABS, usually without primer. For very porous, damp, or glass surfaces, a compatible primer improves long-term adhesion.
Why Importers Choose BOSLAI as their global supplier?
As a dedicated sealant manufacturer in China, BOSLAI supplies distributors and contractors across 40+ countries. Our polyurethane formulation is produced in a 10,000-ton facility with strict batch-to-batch consistency. OEM clients receive private-label packaging, custom formulation adjustments, and full export documentation including TDS, MSDS, and COA. Whether you need a reliable polyurethane sealant supplier for ongoing distribution or a factory partner for branded product lines, BOSLAI delivers quality at competitive FOB pricing.
