Automotive glass bonding
Windscreen, side and rear glass adhesives — 310 ml cartridges, sausages and 200 L barrels.
KA518
Polyurethane Windshield Adhesive
General-purpose moisture-curing adhesive for bonded windscreens, 310 ml cartridges.
KA520
High-Strength Windscreen Adhesive
Higher-modulus grade for bus and coach glazing.
KA530F
Fast-Drying Glass Adhesive
Two-hour positioning at 23 °C with a 6.5 MPa cured tensile strength.
Compare the models
| Model | Tensile strength | Elongation at break | Skin time | Shore A |
|---|---|---|---|---|
| KA518 | 3.5 | 320 | 30 | 65 |
| KA520 | 4.5 | 450 | 40 | 60 |
| KA530F | 6.5 | 450 | 15 | 58 |
Typical values from the catalogue; the batch record carries the measured result.
Choosing one
Choose by the bay, not by the tensile figure. A workshop that can hold the vehicle uses KA518; throughput and winter work need KA530F and its 15-minute skin; a coach with an 8 m glass needs KA520 and its 40 minutes. The grades span 3.5–6.5 MPa, but the schedule decides more jobs than the strength number.
Where it goes wrong
The comeback is rarely the adhesive. A bead laid at 5 °C reaches 4 mm in a day and the glass moves overnight; a frit wiped with a silicone-contaminated rag lifts within a month. Both read as "bad batch" in the workshop and neither is: one is temperature, the other is contamination.
Tensile is not the number to buy on. Elongation and skin time decide whether the glass stays put, and the 3.5–6.5 MPa range exists so a heavier glass gets a higher-modulus bead — not so a buyer picks the biggest figure on the page.
Decision table
| If | Then | Because |
|---|---|---|
| The bay can hold the vehicle overnight | KA518 | 30-minute skin and the lowest cost per cartridge |
| Cars must leave the same day | KA530F | 15-minute skin, 2-hour positioning at 23 °C |
| Coach, bus or an 8 m glass | KA520 | 4.5 MPa tensile and 40 minutes to seat the glass |
| Bay temperature below 10 °C | KA530F plus heat | cure slows before skin time does |
Read before you specify
- why elongation decides before tensile
- the 8–10 mm triangle and what it controls
- what primerless does and does not remove
Other families
- Body and sheet metal — Seam sealers for body panels, doors and container joints — sandable, paintable, four colours.
- Construction joints — Concrete, tunnel and drainage sealants — 550–615% elongation, elastic recovery up to 80%.
- Industrial and STP — Silyl-terminated polymer sealant for metal, plastic and glass — primerless and paintable.
- Wood and glulam — One-component PUR for engineered timber, glulam beams and sandwich panels.
- Activators and primers — Surface preparation that decides whether the bead holds: K-901 activator, K-801 primer.