Adhesive Bond Strength: polyurethane
Adhesive bond strength data — lap shear strength, peel strength, service temperature, cure conditions, and substrate compatibility by adhesive type and variant. Covers epoxy, acrylic (methacrylate, cyanoacrylate), polyurethane, silicone (RTV, structural glazing), anaerobic (threadlocker, retaining, gasket), and phenolic/modified phenolic adhesive systems.
| adhesive category | adhesive variant | adhesive family | cure temp F (F) | cure time at cure temp hr (hr) | elongation at break pct (%) | full cure days (days) | gap fill max in (in) | hardness shore d (Shore D) | lap shear strength max psi (psi) | lap shear strength min psi (psi) | lap shear strength typical psi (psi) | lap shear strength unit | mix ratio by weight | notes | open time min (min) | peel strength max pli (lbf/in) | peel strength min pli (lbf/in) | peel strength typical pli (lbf/in) | peel strength unit | service temp max F (F) | service temp min F (F) | substrate group | viscosity cp (cP) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| polyurethane | acrylic_modified | acrylic | 77 | 0.5 | 100 | 1 | 0.1 | 65 | 5,500 | 2,500 | 4,000 | psi | 4:1 | Acrylic-urethane hybrid; fast fixture; high peel and impact; for SMC composites and thermal plastic bonding; no surface prep | 15 | 55 | 15 | 30 | pli | 220 | -40 | polymer | 20,000 |
| polyurethane | flexible_single_component | polyurethane | 77 | 24 | 300 | 7 | 0.25 | 35 | 1,000 | 300 | 600 | psi | 1:0 | 1K moisture-cure PU; excellent flexibility and elongation; for vibration damping bonds; construction sealant/adhesive | 60 | 25 | 5 | 12 | pli | 200 | -40 | glass | 15,000 |
| polyurethane | flexible_two_component | polyurethane | 77 | 2 | 200 | 2 | 0.2 | 45 | 1,500 | 500 | 1,000 | psi | 1:1 | 2K PU; faster cure than 1K; excellent low-temperature flexibility; auto body / marine panel bonding | 30 | 35 | 8 | 18 | pli | 200 | -40 | glass | 12,000 |
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