Adhesive

The most critical factor is matching the adhesive's chemical properties to the surface energy of the substrates. For low surface energy plastics like PP or PE, you must specify polyolefin bonders or use primers. For metal-to-metal bonding, prioritize epoxies or structural acrylics which offer high shear strength. Always request a compatibility matrix from the supplier to ensure the adhesive won't cause stress cracking or poor adhesion over time.

You must evaluate the Viscosity (measured in mPa·s) to ensure it suits your application method (spray, brush, or automated dispensing). Key performance metrics include Lap Shear Strength (ASTM D1002), T-Peel Strength, and Elongation at Break. For electronics, verify Dielectric Strength and Thermal Conductivity. Ensure the supplier provides a Technical Data Sheet (TDS) for every batch to guarantee consistency in curing time and pot life.

Adhesives are chemical products and must comply with REACH (EU) or TSCA (US) regulations. A professional supplier must provide a Material Safety Data Sheet (MSDS/SDS) that aligns with the Globally Harmonized System (GHS). For food-contact applications, ensure FDA 21 CFR 175.105 compliance. If the product is for the automotive or electronics sector, check for RoHS and UL certification to avoid customs rejection or legal liability.

Industrial adhesives must be vetted for their Service Temperature Range; for instance, silicone adhesives excel in high-heat environments up to 250°C, while cyanoacrylates may fail. If the product is for outdoor use, specify UV resistance and hydrolytic stability to prevent yellowing or degradation. Request accelerated aging test reports to verify long-term durability in humid or chemically aggressive environments.

Many adhesives are classified as Class 3 Flammable Liquids or Class 9 Miscellaneous Dangerous Goods. You must ensure the supplier provides a Certification for Safe Transport of Chemical Goods. Failure to declare hazardous materials can lead to heavy fines, shipment seizure, or blacklisting by carriers. Always confirm if the supplier has experience with UN-rated packaging to prevent leakage during sea or air transit.

Before placing a bulk order, utilize Made-in-China.com's 'Audited Supplier' reports to verify the manufacturer's production capacity and R&D facilities. Request a pre-shipment inspection (PSI) to test the shelf life and bonding strength of the specific batch. It is highly recommended to use Secured Trading Services to ensure payment is only released once the quality meets the agreed-upon specifications.

Adhesive pricing is often tied to raw material indices (like epoxy resin or silicone oil prices). Negotiate a formula-based pricing model for long-term contracts. For MOQs, if you are a new buyer, suggest a trial order of 50-100kg to test market fit. Suppliers on Made-in-China.com are often willing to lower MOQs if you agree to pay for customized labeling or specialized packaging upfront.

Adhesives have a limited shelf life (typically 6–12 months). Ensure the contract specifies that products must have at least 80% of their shelf life remaining upon arrival. For temperature-sensitive adhesives (like certain epoxies), you must arrange for reefer containers (refrigerated shipping) and use temperature data loggers inside the packaging to monitor conditions throughout the journey.