A windshield star-break and a vertical glass display panel both call for a UV glass-and-metal bonder, but the correct viscosity for one would fail outright on the other — one needs to wick into a hairline crack, the other needs to sit still on a vertical face without sagging before cure. Incure’s Uni-Weld™ glass and metal bonder line spans that entire range in a single product family.
Viscosity Runs From Capillary Flow to Non-Slump Gel
Uni-Weld™ 1910 and Uni-Weld™ 8260 (also available as 8260B in black) sit at the low end, 30–60 cP, thin enough to wick by capillary action into windshield star-breaks and bullseye cracks or any narrow gap where the adhesive has to travel to the damage rather than sit on top of it. Uni-Weld™ 1931, at 90–180 cP, is a step up for slightly wider gaps that still need flow-driven penetration rather than bead placement. Mid-range grades — Uni-Weld™ 2463 (450–900 cP), Uni-Weld™ 2204 and Uni-Weld™ 3253 (both 1,200–2,400 cP), and Uni-Weld™ 2813 (2,700–5,400 cP) — cover standard bead dispensing on horizontal or lightly angled joints. At the thixotropic end, Uni-Weld™ 2204VT and 2204VTL (18,000–36,000 cP) hold position on vertical glass without sliding before cure locks it in. Uni-Weld™ 2463G goes further still, at over 1,000,000 cP — effectively a non-flow gel rather than a dispensed bead, built for dam-and-fill encapsulation and CIPG gasketing where any migration off the intended path would foul an adjacent surface.
Tensile Strength Varies by a Factor of Nearly 3x Across the Line
Metal-to-glass tensile strength isn’t uniform across the family, and the spread matters when a joint is load-bearing rather than just sealing. Uni-Weld™ 3253 posts the highest documented metal-to-glass tensile in the line at 11,000 psi, with 35% elongation that lets the bond absorb some flex rather than transmitting all of the load as pure shear. Uni-Weld™ 1931 (9,800 psi) and the 8260/8260B pair (9,500 psi) follow closely behind, both at low elongation (4% and 8% respectively) — rigid, high-strength bonds suited to joints that need to hold dimension under load rather than flex. Uni-Weld™ 2463 and 2463G both reach 8,400 psi, while Uni-Weld™ 2813 comes in at 8,200 psi with 35% elongation, giving it the same flex-under-load profile as 3253 at a slightly lower strength ceiling. Uni-Weld™ 1910, at 6,500 psi, and Uni-Weld™ 2204/2204VT/2204VTL, at 5,900 psi, sit at the lower end of the tensile range but remain well within structural-bond territory for lighter assemblies.
Email Us with your joint’s load direction, expected tensile requirement, and dispensing method, and Incure’s engineers can match a specific Uni-Weld™ grade rather than a general viscosity band.
Dual-Cure Options for Shadowed Bond Lines
Standard Uni-Weld™ grades require direct UV access to the entire bond line to reach full cure. For assemblies with shadowed or inaccessible geometry — a joint partially hidden behind a housing wall or bracket — dual-cure UV/anaerobic and UV/heat grades are available. The UV-exposed portion of the bond locks instantly on demand, while the shadowed section completes cure through the secondary mechanism, which matters because an incompletely cured shadow zone can crack under the same thermal cycling that causes visible failure in fully-cured joints elsewhere in an assembly even when the two areas looked identical right after assembly.
Matching Grade to Application
Windshield and automotive glass crack repair calls for the lowest-viscosity grades — Uni-Weld™ 1910 or 8260 — since wicking into a star-break or bullseye crack depends entirely on capillary flow reaching damage that a thicker bead never would; the tradeoffs against a two-part repair system are covered more broadly in Incure’s comparison of UV glue and epoxy for fixing cracked glass surfaces. Permanent-magnet bonding in DC motors, loudspeakers, and sensors draws on the higher-tensile grades — 3253 or 2813 — since magnet joints see sustained pull forces layered on top of thermal cycling rather than a single static load, a combination also addressed from the epoxy side in Incure’s guide to bonding magnets in motors and actuators. Metal bracket, cover, and enclosure assembly typically uses the mid-viscosity bead grades (2204, 2463) to replace mechanical fasteners and slow-curing epoxies with UV-on-demand fixation. Vertical glass positioning, dam-and-fill encapsulation, and CIPG gasketing are the domain of the thixotropic and gel-viscosity grades — 2204VT, 2204VTL, and 2463G — where holding position without sagging matters more than reaching the family’s highest tensile numbers. Glass furniture and retail display bonding calls for the non-yellowing, optically clear formulations within the line, since bond-line discoloration is directly visible on furniture-grade glass in a way it isn’t on a hidden structural joint.
Cure Speed and Equipment
Uni-Weld™ glass and metal bonders reach a functional cure in seconds under a UV lamp at the recommended wavelength, typically 365 nm, with full mechanical strength following within seconds to a few minutes depending on the specific grade, lamp intensity, and bond line thickness. That schedule holds across Incure’s UV LED spot lamps (L9000™), UV LED flood lamps (L-Series™), and UV cure chambers (B/C-Series™), so the equipment choice comes down to part geometry and throughput rather than a different cure profile per lamp type. Every grade in the line is RoHS and REACH compliant.
Contact Our Team to match a specific Uni-Weld™ glass-and-metal grade to your substrate, load direction, and dispensing method.
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