PUR Hot Melt Adhesive

Product Overview

PUR hot melt adhesive is a high‑performance, one‑component moisture‑curing reactive polyurethane hot melt adhesive. Based on polyurethane prepolymers, it is solid at room temperature and is applied in molten form after heating. Upon cooling, it forms a physical bond, which is then followed by a cross‑linking reaction with ambient moisture (or moisture present on the substrate surface), generating a three‑dimensional polymer network. This transformation from a thermoplastic to a thermosetting state endows PUR adhesives with bonding strength, weatherability, and durability far exceeding those of conventional hot melts. The adhesion and flexibility can be flexibly tailored through formulation design to accommodate different coefficients of thermal expansion of various materials, effectively relieving stress concentration and ensuring long‑term reliable bonding. With its outstanding all‑round performance, this adhesive finds extensive applications in packaging, woodworking, automotive manufacturing, textile lamination, electronics, electromechanical equipment, and aerospace industries.

Key Features

• Environmentally Friendly and User‑Friendly – 100% solids content, containing no organic solvents and zero VOC emissions, fully compliant with environmental regulations. The application process produces no unpleasant odours, is safe for operators, and eliminates the need for a drying step, resulting in energy savings and higher efficiency.
• Broad Temperature and Weather Resistance – After curing, the adhesive exhibits excellent resistance to high‑temperature creep and low‑temperature embrittlement. It maintains stable bonding performance over a wide temperature range (e.g., –40 °C to 120 °C, or even higher). It also offers outstanding resistance to moisture, steam, chemicals (such as oils, acids/alkalis, and detergents), and organic solvents, making it suitable for harsh environments.
• Superior Bonding Strength – Demonstrates exceptionally high initial tack and ultimate peel strength on a variety of substrates, including metals, glass, ceramics, engineering plastics (e.g., ABS, PC, PA), composites, and wood. It performs notably well under dynamic loads and impact conditions.
• Versatile Processability – Open time can be adjusted (from a few seconds to several tens of minutes) to suit manual or high‑speed automated coating lines. Curing speed can be controlled by temperature and humidity, accommodating different production cycle requirements.

Main Application Areas (Examples)

Consumer Electronics – Structural bonding of mid‑frames and housings for smartphones, tablets, and wearable devices, as well as sealing of touchscreens and bezels, providing impact resistance and waterproof/dustproof protection.

Home Appliance Manufacturing – Bonding of top covers, panels, and decorative trims for disinfection cabinets, dishwashers, washing machines, etc., replacing double‑sided tape or screws, enhancing appearance and simplifying assembly processes.

Printing & Bookbinding – Perfect binding for high‑quality books and art albums, giving spines excellent flexibility and folding endurance, preventing cracking or page loss over time.

Automotive Industry – Structural bonding and sealing of lamp housings and lenses (headlamps, rear lamps), ensuring air‑tightness and weatherability; lamination of interior trim components (dashboards, door panels); as well as wire harnessing and bonding for vibration‑damping and noise‑reduction parts.

Other High‑End Sectors – Sealing of sensors and coils in electromechanical equipment; lamination of composite materials for aerospace interiors; textile bonding (functional apparel, footwear materials), among others.