| Adhesive Chemistry | Determines bonding mechanism, chemical resistance, temperature capability, flexibility, and processing requirements. | Select chemistry according to the substrate and application: epoxy for high strength and chemical resistance; acrylic for fast fixture; polyurethane for flexibility; silicone for elastic, weather-resistant joints. | Technical Data Sheet, Safety Data Sheet, formulation or chemistry statement, substrate compatibility data. | 12% |
| Curing Method | Cure requirements affect equipment investment, cycle time, energy consumption, and production reliability. | Clearly defined cure profile for two-component, heat-cure, moisture-cure, anaerobic, or light-cure systems. Cure conditions should be reproducible within the stated tolerance. | Cure schedule, fixture-time data, conversion or cure-depth data, recommended dispensing and mixing parameters. | 10% |
| Bond Strength | Strength data confirms whether the product can meet the mechanical demands of the final assembly. | Compare tensile-shear, tensile, peel, and cleavage results using the same substrate, surface preparation, bondline thickness, cure cycle, and test temperature. | Test reports based on ASTM D1002 or ISO 4587 for tensile-shear performance, plus application-specific validation. | 14% |
| Temperature Resistance | Adhesive properties may change significantly during continuous operation, thermal cycling, or short-term exposure to heat. | Require continuous-use and peak-temperature limits separately. Validate performance after thermal aging and thermal cycling rather than relying only on a maximum temperature claim. | Thermal aging report, temperature-cycle results, post-aging bond-strength data, recommended service-temperature range. | 10% |
| Viscosity and Dispensing | Viscosity influences bead consistency, automated dispensing, mixing, wetting, and the risk of voids or overflow. | Supplier should provide viscosity at a stated temperature and test method, together with thixotropic behavior, mixing ratio, and allowable dispensing window. | Viscosity curve, rheology data, mixing-ratio tolerance, nozzle or cartridge compatibility, process trial results. | 8% |
| Open Time and Fixture Time | The correct working time supports assembly positioning while a short fixture time improves throughput. | Values must be reported with temperature, humidity, adhesive quantity, substrate, and test method. Do not compare supplier claims made under different conditions. | Technical Data Sheet, line-trial results, fixture-time definition, operator or equipment process window. | 8% |
| Durability and Environmental Resistance | Humidity, water, salt spray, chemicals, vibration, and UV exposure can reduce long-term bond reliability. | Require aging data that reflects the actual service environment and includes retained bond strength, failure mode, and test duration. | Humidity aging, water immersion, chemical compatibility, salt-spray, UV, and vibration test reports where applicable. | 12% |
| Substrate Compatibility | Metals, plastics, glass, ceramics, composites, coatings, and low-surface-energy materials require different surface preparation and primers. | Supplier should provide results for the buyer’s exact substrate grades, surface finishes, cleaning process, and primer requirements. | Substrate matrix, surface-preparation instructions, primer data, failure-mode analysis, sample-bond validation. | 10% |
| Regulatory and Product Compliance | Incomplete compliance documentation can delay customs clearance, customer approval, and market entry. | Documentation should address the destination market and intended use, including applicable chemical, restricted-substance, transport, and sector-specific requirements. | Current SDS, restricted-substance declaration, REACH and RoHS statements where applicable, transport classification, quality certificates. | 8% |
| Shelf Life and Packaging Stability | Storage conditions and remaining shelf life affect inventory risk, import planning, and production continuity. | Require stated shelf life, storage temperature, packaging configuration, batch traceability, and minimum remaining shelf life at delivery. | Shelf-life statement, stability data, batch certificate, packaging specification, storage and transport instructions. | 6% |
| Quality Consistency | Stable viscosity, cure behavior, color, and bond strength are essential for repeatable global production. | Evaluate batch-to-batch control, change-notification procedures, corrective-action response, and lot traceability. | Certificate of Analysis, quality-management certification, control plan, change-control policy, nonconformance procedure. | 6% |
| Global Supply and Technical Support | Local technical support, reliable export documentation, and contingency planning reduce launch and supply-chain risk. | Assess sample response time, engineering support, lead-time consistency, export capability, backup production, and communication coverage. | Sample-service record, technical escalation process, lead-time history, capacity statement, business-continuity plan, logistics documentation. | 6% |
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