PUR hot melt adhesive (polyurethane) is a reactive, moisture-curing adhesive. Strong bonds. Heat, cold, and moisture resistance. Applied molten like a conventional hot melt, then it cross-links with atmospheric moisture to a thermoset.
After application it builds 50–80% of final strength in about 3–6 hours, depending on humidity and substrate moisture. Full cure is typically 24 hours. Service range: about −40°F to +300°F. Green strength in minutes so parts can be handled. Wide open-time grades exist.
Bonds
Solid wood and veneer, MDF/particle board, metals, papers, glass, fiberglass, foams, plastics, rubber, PVC, foils.
Forms
Cartridges, foil slugs, pails, drums. Spray or roll coat for large panels (doors, garage doors, RV walls, SIP panels). Also foil-to-metal for cans and caps.
Vs solvent adhesives
100% solids, no HAPs/VOCs from solvent; fast set; no dryer; lower explosion risk. Tradeoffs: equipment, application up to about 300°F, shorter shelf life, cleanup before it cures in the tank, crosslinking in the tank if mishandled.
Panels, woodworking, bookbinding, assembly
Cabinet and millwork; veneer and profile wraps; RV and SIP panels; garage doors; bookbinding spines; foam-to-substrate assembly; foil-to-metal for cans/caps where a reactive melt is specified. Spray or roll coat large panels; cartridges for discrete assembly.
We can formulate
Open time from minutes to 45+ minutes; green strength; viscosity at application temperature; flexible vs rigid final film; substrate pairs (wood, metal, foam, PVC, plastics — confirm). Moisture-cure rate tracks humidity and substrate moisture; plan clamp/fixture time accordingly.
Stock PUR grades
| Product number | Use |
|---|---|
| 8600 | Fast tack, cabinets/steel/woods/EPS, ~4000 cps at 250°F, ~4 min open, ~10 hr cure. |
| 8463 | High green strength, RV panels, ~9000 cps at 250°F, 3–4 min open. |
| 8730 | Cold liquid PUR (room temp, ~7000 cps at 74°F). See liquid PUR page. Not for vinyl, PP, PE, polyolefins. |
| 8493 | Long open time 45 min+, EPS foam, flexible bonds, 2–4 hr cure, ~9000 cps at 250°F. |
| PUR-Purge-1000 | Purge compound, 250–350°F. |
Looking for room-temperature liquid PUR polyurethane (not hot melt)? Start there. We also supply 2-part polyurethanes and epoxy adhesives.
How to run PUR hot melt
How to apply, handle, clean up and store reactive hot melt adhesive · How to solve bookbinding problems
Also: hot melt system trouble shooting · liquid PUR when a room-temp system is better than a melt tank.
Call 800-249-0337 for a cartridge or pail sample.
PUR hot melt adhesive FAQ
What is PUR hot melt adhesive?
PUR hot melt adhesive (polyurethane) is a reactive, moisture-curing adhesive. Strong bonds. Heat, cold, and moisture resistance. Applied molten like a conventional hot melt, then it cross-links with atmospheric moisture to a thermoset.
How long does PUR hot melt take to cure?
Green strength comes in minutes, so parts can be handled. After application it builds 50–80% of final strength in about 3–6 hours, depending on humidity and substrate moisture. Full cure is typically 24 hours. Moisture-cure rate tracks humidity and substrate moisture; plan clamp/fixture time accordingly.
What temperature range can PUR hot melt bonds handle?
About −40°F to +300°F. Heat, cold, and moisture resistance.
What substrates does PUR hot melt bond?
Solid wood and veneer, MDF/particle board, metals, papers, glass, fiberglass, foams, plastics, rubber, PVC, and foils. Substrate pairs should be confirmed with Cattie.
What forms does Cattie PUR hot melt come in?
Cartridges, foil slugs, pails, and drums. Spray or roll coat for large panels (doors, garage doors, RV walls, SIP panels); cartridges for discrete assembly. If a room-temp system is better than a melt tank, see our liquid PUR polyurethane.
What is PUR hot melt used for?
Cabinet and millwork; veneer and profile wraps; RV and SIP panels; garage doors; bookbinding spines; foam-to-substrate assembly; foil-to-metal for cans/caps where a reactive melt is specified.
How does PUR hot melt compare with solvent adhesives?
PUR hot melt is 100% solids, with no HAPs/VOCs from solvent, fast set, no dryer, and lower explosion risk. Tradeoffs: equipment, application up to about 300°F, shorter shelf life, cleanup before it cures in the tank, and crosslinking in the tank if mishandled.
What PUR hot melt properties can Cattie formulate?
Open time from minutes to 45+ minutes; green strength; viscosity at application temperature; flexible vs rigid final film; and substrate pairs (wood, metal, foam, PVC, plastics — confirm).
How do I get a PUR hot melt sample?
Call 800-249-0337 for a cartridge or pail sample, or email sales@cattieadhesives.com for an adhesive, an SDS, or a sample. Cattie Adhesives is based in Quakertown, PA 18951.
