CHEMPU Polyurethane (PU) Construction Sealant Lineup
Engineered for high tear resistance, paintability, and extreme elastomeric recovery across civil concrete joints, precast wall panels, and heavy industrial floors.
Need Technical Selection Support or Bulk Polyurethane Tender Pricing?
Our chemical engineers assist with joint design, primer recommendations, and ISO 11600 / ASTM C920 test documentation.
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Polyurethane Sealant Engineering Design & Application Guide
Comprehensive technical reference for civil structural engineers, precast facade installers, and industrial flooring contractors specifying CHEMPU PU-30 and PU-40 elastomeric sealants.
📐 Joint Dimensioning Rules & Theoretical Coverage Calculator
To ensure maximum fatigue resistance under cyclic thermal expansion and building settlement, joint geometry must follow standard engineering aspect ratios. For joint widths between 10 mm and 20 mm, maintain a 1:1 width-to-depth ratio. For joints wider than 20 mm, maintain a 2:1 width-to-depth ratio (depth = width / 2). Always insert closed-cell polyethylene backing rod to prevent three-sided adhesion.
⚙️ 4-Step Professional Substrate Application SOP
❓ Frequently Asked B2B Technical Procurement Questions
Q1: What is the primary difference between CHEMPU PU-30 and PU-40?
PU-30 is a Low-Modulus (25 Shore A) sealant engineered for maximum cyclic movement (±25%) in precast concrete joints, civil masonry, and indoor expansion seams where high elasticity prevents substrate edge spalling. PU-40 is a High-Elasticity UV-Resistant (35 Shore A) formulation containing proprietary hindered amine light stabilizers (HALS) specifically formulated for exterior building envelopes, parapet copings, and metal roof lap seams exposed to prolonged UV radiation.
Q2: Can CHEMPU polyurethane sealants be painted over?
Yes. Unlike silicone sealants which repel paints, CHEMPU PU sealants are 100% paintable with water-borne acrylic paints and most polyurethane facade coatings once full depth cure is achieved (typically 3–5 days depending on ambient humidity). Preliminary adhesion testing is always recommended for solvent-based alkyd enamels.
Q3: What export packaging configurations and container loading quantities are available?
Standard packaging includes 600ml aluminum foil sausages (20 pcs/carton, 1,200 cartons/20GP FCL ≈ 24,000 sausages) and 310ml HDPE cartridges (24 pcs/carton, 1,800 cartons/20GP FCL ≈ 43,200 cartridges). For automated robotic dispensing plants, 200L steel drums are supplied with nitrogen purge seal.
Q4: What testing certifications and standards does CHEMPU support for bidding?
CHEMPU polyurethane sealants comply with ISO 11600 Class 25LM and ASTM C920 Type S, Grade NS, Class 25. We provide batch-specific Certificate of Analysis (COA), tensile elongation test reports, VOC compliance certifications, and global MSDS in multilingual versions.
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Looking for alternative chemistries or specialized sealing systems? CHEMPU manufactures a complete spectrum of high-performance construction adhesives and sealants for global engineering contractors and distributors.
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