Wholesale Adhesive & Sealant Suppliers
Adhesives and sealants are critical functional materials for construction, automotive assembly, electronics manufacturing, packaging, and medical devices. Towobo connects buyers with verified wholesale suppliers of structural adhesives (epoxy, polyurethane, methacrylate), sealants (silicone, polyurethane, polysulfide, MS polymer), hot-melt adhesives, pressure-sensitive adhesives (PSA), and reactive adhesives (cyanoacrylate, anaerobic). Sourced from Germany, USA, Japan, China, and the Netherlands with full REACH documentation, VOC compliance data, and food-contact approvals where applicable.
Adhesive and Sealant Types
Epoxy adhesives: two-component systems (A+B mix ratio 1:1 or 2:1) for high-strength bonding (lap shear >25 MPa), gap-filling and potting; single-component heat-cure for electronics. Polyurethane adhesives: flexible 1K or 2K for automotive windscreens (FMVSS 212), wood lamination, and sandwich panels; contact adhesives for footwear. Silicone sealants: acetoxy (acetic acid byproduct) and neutral cure (oxime, alkoxy); high-temp resistance to 300°C (Momentive RTV, Dow Corning); food-grade silicone (FDA 21 CFR 177.2600). Hot-melt adhesives: EVA-based for packaging and bookbinding; polyolefin and metallocene for low-odour food packaging; PUR hot-melt for woodworking laminates (water-resistant). PSA: acrylic emulsion or solvent PSA for labels, tapes, and medical dressings; rubber/resin PSA for masking tape. Cyanoacrylate: instant bonding of metals, plastics, rubber; 1–10 cps for gap filling.
Bond Strength and ASTM Testing
Key mechanical tests: ASTM D1002 (lap shear, aluminium substrates, gives MPa); ASTM D897 (tensile adhesion); ASTM D1876 (peel T-test); ASTM D3163 (adhesive comparison lap shear — bonded plastic). ISO 4587 (lap shear — bonded assemblies) is the European equivalent. Structural adhesives achieve lap shear 15–35 MPa; hot-melts typically 2–8 MPa; PSA peel strength 5–30 N/25mm. Always request test data on the relevant substrate (metal, plastic, glass, wood) as adhesion performance varies significantly by substrate surface energy and preparation.
Temperature and Chemical Resistance
Silicone sealants: continuous operating temperature −60°C to +300°C; some high-performance grades to +350°C (Dow Corning 730). Epoxy: −40°C to +120°C continuous (−55°C to +175°C with elevated-cure high-Tg systems). Polyurethane: −40°C to +90°C; good chemical resistance to oils and fuels. Cyanoacrylate: poor resistance to water/moisture long-term (bond degrades) and temperatures >80°C. For automotive underbonnet applications requiring 150°C+ resistance: two-component methacrylate or epoxy structural adhesives. For fuel and oil resistance: MS polymer (modified silicone) sealants outperform standard polyurethane.
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