Overview
Malisan grouting material is a two-component polyurethane resin system widely used in geotechnical engineering and construction. Developed for challenging underground conditions, it combines a polyol component with an isocyanate component that reacts upon contact with water. The material was originally developed for mining applications but has become essential for civil engineering projects requiring rapid stabilization of loose rock or soil. The product's name 'Malisan' has become genericized in some markets for similar PU grouting materials. Professional-grade formulations offer controlled expansion rates and adjustable gel times, allowing engineers to tailor the material to specific project requirements from quick emergency repairs to precise structural reinforcement.
Physical and Chemical Properties
Uncured Malisan exhibits viscosity between 200-800 mPa·s (varies by grade), allowing injection through narrow cracks or boreholes. Upon water contact, it undergoes exothermic polymerization, expanding to 3-20 times its original volume depending on formulation. The cured foam develops compressive strengths ranging from 10-50 MPa, with density typically 0.3-0.8 g/cm³ after expansion. Key chemical properties include excellent resistance to acids, alkalis, and salts (pH 3-11), making it suitable for harsh environments. The material achieves 90% of its final strength within 1-4 hours, with full curing in 24 hours. Special low-viscosity versions are available for fine crack penetration (<0.1mm), while high-expansion formulas are used for large void filling.
Main Applications
In mining operations, Malisan stabilizes fractured rock masses ahead of excavation faces, preventing collapses. The material's rapid curing (30s-10min adjustable) makes it ideal for emergency roof support. Tunnel builders use it for waterproofing through its dual action of crack filling and water-reactive expansion that seals leakage paths. Civil engineering applications include bridge abutment stabilization, where its lightweight expansion reduces load on weak substrates. Subway systems employ it to stop water ingress through concrete segment joints. Recent developments include earthquake-resistant formulations that maintain flexibility after curing, allowing movement without losing sealing properties.
Safety and Storage
The isocyanate component is moisture-sensitive and may generate CO2 during storage if containers are compromised. Properly sealed drums maintain stability for 6-12 months at recommended temperatures. Frozen material should be gradually warmed to 20°C before use without direct heating. Application requires cartridge guns or specialized pumps capable of handling the viscous components. Worker protection includes respirators with organic vapor filters when used in confined spaces, as curing releases small amounts of volatile compounds. Spill containment measures should prevent groundwater contamination, though cured material is environmentally inert.
B2B Procurement Guide
Industrial buyers should verify supplier testing data for key parameters: expansion pressure (typically 0.5-3MPa), bond strength (>1MPa to concrete), and water absorption (<5% by weight). Mining operations often require MSDS documentation meeting specific regional regulations like EU REACH or China GB standards. Bulk purchasing (200kg+ drums) reduces costs by 15-30% compared to cartridge packaging. Some manufacturers offer custom formulations with tracer dyes for quality control or fluorescent additives for post-application inspection. Lead times vary from stock availability to 4-6 weeks for specialty grades.
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