# Wood and glulam One-component PUR for engineered timber, glulam beams and sandwich panels. [KA505 ### PUR Wood Adhesive One-component PUR for glulam and engineered timber.](https://karmindadhesive.com/products/ka505-wood-adhesive/) ## Choosing one The decision is moisture and clamp time, not strength. KA505 bonds at 8–12% moisture content with 1–4 h clamp depending on temperature; wet or frozen timber foams and dry timber starves. It is not an EN 301 adhesive, so a project requiring EN 301 is asking for MUF or PRF. ## Where it goes wrong The failures are moisture and pressure, not open time. Timber at 18% moisture foams at the glue line and the joint starves; too little clamp pressure leaves a 0.2 mm line that fails within a year. A 5% swing in moisture matters more than 10 minutes of open time. Viscosity is the process number. 5,000–10,000 mPa·s is what a roller or extruder can handle, and 1–4 hours is the clamp time on the line. Neither says anything about bond strength, because the brochure gives no strength figure for this grade. ## Decision table | If | Then | Because | | Glulam at 8–12% moisture content | KA505 | 1–4 hours clamp depending on temperature | | Timber is wet or frozen | dry it first | moisture foams at the glue line and the joint starves | | The project specifies EN 301 | MUF or PRF | KA505 is not an EN 301 adhesive | | Bonding metal or insulation to timber | KA505 | bonds mixed substrates without a primer | ## Read before you specify - [the bonding schedule behind the grade](https://karmindadhesive.com/resources/pur-wood-adhesive-guide/) - [8–12% and what happens outside it](https://karmindadhesive.com/resources/pur-adhesive-moisture-content/) - [temperature against press time](https://karmindadhesive.com/resources/pur-adhesive-clamp-time/) Send species, moisture content and press temperature and we will return a bonding schedule. [martin@karmindadhesive.com](mailto:martin@karmindadhesive.com) ## Other families - [Automotive glass bonding](https://karmindadhesive.com/products/automotive-glass/) — Windscreen, side and rear glass adhesives — 310 ml cartridges, sausages and 200 L barrels. - [Body and sheet metal](https://karmindadhesive.com/products/automotive-body/) — Seam sealers for body panels, doors and container joints — sandable, paintable, four colours. - [Construction joints](https://karmindadhesive.com/products/construction/) — Concrete, tunnel and drainage sealants — 550–615% elongation, elastic recovery up to 80%. - [Industrial and STP](https://karmindadhesive.com/products/industrial/) — Silyl-terminated polymer sealant for metal, plastic and glass — primerless and paintable. - [Activators and primers](https://karmindadhesive.com/products/accessories/) — Surface preparation that decides whether the bead holds: K-901 activator, K-801 primer.