To address your need for English information on glue for broken granite, I’ve compiled key details from professional sources—covering top adhesive types, recommended products, application steps, and critical considerations—to support effective repairs.
The right glue depends on the break size, location, and aesthetic needs. Below are the most reliable options:
- Why it works: Two-part epoxy (resin + hardener) delivers exceptional bonding strength (12–25 MPa) and durability, ideal for large breaks or load-bearing surfaces like countertops .
- Key features: Most are waterproof, heat-resistant, and paintable/polishable to match granite’s finish. Transparent formulas avoid visible seams .
- Top picks:
- 3M DP420 Pro: 25 MPa strength, cures in 24 hours, suitable for professional-grade granite bonding .
- Magpow SK1160: 1:1 mix ratio, 10–15 min pot life, and UV-resistant for outdoor use .
- Why it works: Fast-setting (cures in minutes) with low viscosity, perfect for filling hairline cracks or small chips .
- Key features: Requires an accelerator (e.g., Quick Tack II) for full curing; thin variants (like CA5) seep into pores, while thick versions (CA2400) fill gaps .
- Note: Avoid for structural repairs—lacks flexibility for long-term durability .
- Why it works: Fast gel time (3–6 min) and good polishability, suitable for non-load-bearing repairs (e.g., decorative granite) .
- Key features: Weatherproof and mildew-resistant but less strong than epoxy (shear strength ~9 MPa) .
- Top pick: Sarlsson SMGA4L: Customizable colors, cures in <15 min, ideal for quick aesthetic fixes .
Follow these steps for a seamless, durable fix :
- Clean broken edges with acetone to remove dust/oil.
- Roughen surfaces with 80-grit sandpaper to boost adhesion.
- Dry completely (moisture weakens epoxy bonds).
- For epoxy: Mix resin and hardener (e.g., 1:1 for Magpow SK1160) until uniform—work quickly (10–15 min pot life) .
- For CA glue: Apply thin CA5 to cracks or thick CA2400 to gaps, then spray accelerator .
- Align pieces and clamp with even pressure (avoid over-tightening).
- Cure at 25–35°C (77–95°F) with <75% humidity .
- Wait full curing time (24–72h) before handling.
- Sand excess glue with 120-grit sandpaper, then polish to match granite’s sheen.
- Food Safety: Choose EGA-certified adhesives (e.g., Adiseal) for kitchen countertops .
- Outdoor Use: Prioritize UV-resistant formulas (e.g., 3M DP420 Pro, Magpow SK1160) .
- Color Matching: Opt for tintable epoxy or pre-colored polyester (e.g., Sarlsson’s custom hues) .
- Safety: Wear gloves/eye protection; work in ventilated areas (epoxy fumes irritate) .
If you’re tackling a specific repair—like a kitchen countertop chip or outdoor granite slab—share details (break size, location, color) and I can refine product recommendations or add step-by-step photos. Would you also like links to purchase these adhesives online?
