Overview
AB glue is a thermosetting adhesive composed of two components - an epoxy resin (Part A) and a hardener (Part B). When mixed in specified ratios (commonly 1:1 or 2:1), it undergoes an irreversible chemical reaction to form a rigid plastic material with exceptional bonding strength. First developed in the 1940s, modern AB glues offer improved formulations with faster cure times (5 minutes to 24 hours) and specialized properties like high-temperature resistance (up to 200°C for industrial grades). The adhesive is valued across industries for its ability to bond dissimilar materials permanently.
Physical and Chemical Properties
Unmixed components have viscosities ranging from 500-15,000 cP (resin) and 50-1,000 cP (hardener), allowing application by syringe, spatula, or automated dispensing systems. Mixed viscosity depends on ratio and temperature. Cured adhesive exhibits tensile strength of 20-50 MPa and shear strength of 15-30 MPa, with elongation at break typically 3-6%. It demonstrates excellent resistance to water, oils, and most solvents after full curing (24-72 hours). Thermal expansion coefficients range from 50-80×10^-6/°C, similar to many metals it bonds.
Main Applications
In automotive manufacturing, AB glue bonds brake pads, attaches mirrors, and seals fuel systems. Electronics manufacturers use it for component potting and PCB encapsulation due to its dielectric properties (volume resistivity >10^15 Ω·cm). Construction applications include anchoring rebar, bonding concrete cracks, and installing stone cladding. Consumer uses range from jewelry repair to household item fixes. Specialized medical-grade formulations exist for dental applications and orthopedic device assembly.
Safety and Storage
Uncured components may cause skin irritation or allergic reactions. Adequate ventilation is required during application as some formulations emit volatile compounds. Store between 15-25°C in original sealed containers - resin component typically has 12-24 month shelf life, while hardeners last 6-12 months. Disposal must comply with local regulations. Uncured mixed adhesive should be allowed to harden before disposal as solid waste. Large quantities require treatment as chemical waste due to reactivity.
B2B Procurement Guide
Industrial buyers should specify: 1) Required bond strength (lap shear, peel, or tensile values) 2) Operating temperature range 3) Substrate materials 4) Cure time requirements 5) Any regulatory certifications needed (e.g., FDA, UL). Bulk purchases (200kg+) typically offer 15-30% cost savings. Consider automated mixing/dispensing equipment for high-volume applications to ensure ratio accuracy. Reputable suppliers provide technical data sheets with full mechanical property test results.
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