3M™ Impact Resistant Structural Adhesive PNs 07333, 57333
3M Impact Resistant Structural Adhesive 07333/57333 is a two-part impact-resistant structural epoxy adhesive tailored for OEM-specified structural bonding in automotive and industrial applications. It offers extended work time, heat-accelerated cure options, high impact strength and corrosion protection, and visual cure indication via color change. It bonds prepared steel and aluminum and is suitable for weld-bonded or rivet-bonded joints within its work window.
Key Features
Impact-resistant two-part epoxy — engineered to absorb collision energy and resist peel and cleavage stresses better than conventional bonding adhesives.
Extended work time — up to ~60 minutes at room temperature, allowing precise positioning before curing begins.
Color-change indicator — dispenses as a silver paste that turns purple as it cures, helping indicate when the curing process has started.
Heat-accelerated curing — cures rapidly with heat (~30 min at ~80 °C) in many applications.
Corrosion protection — formulated to provide corrosion inhibition and long service life.
OEM-specified performance — recommended by many automotive manufacturers for structural bonding use.
Applications
This adhesive is primarily used for structural bonding in automotive and industrial fabrication:
Automotive structural repairs — frame rails, rocker panels, pillars, strut towers, and unibody members.
Collision repair structural bonding — designed to meet OEM specifications where impact resistance is critical.
Hybrid joining methods — can be weld-bonded or rivet-bonded while uncured within the work window.
Steel and aluminum substrates — adheres well to properly prepared mild steel, high-strength steel, and automotive aluminium alloys.
Product Data
| |
| Property | Typical Value |
| Base Type | Two-part epoxy adhesive |
| Container Sizes | 07333 — 200 mL cartridge / 57333 — 450 mL cartridge |
| Work Time | Up to ~60 min at 23 °C |
| Cure Time | ~24 hrs at 23 °C; heat-accelerated ~30 min at 80 °C |
| Color (uncured) | Silver |
| Color (cured) | Purple (indication of cure) |
| Recommended Substrates | Properly prepared steel & aluminum |
| Application Methods | Cartridge with static mixer or manual mixing |
| Corrosion Protection | Yes (lifetime warranty in many uses) |
Application & Processing
Surface Preparation: Clean substrates (remove oil, rust, contaminants) to ensure good adhesion.
Mix/Dispense: Use appropriate static mixing nozzle (e.g., 55847 for 57333) and applicator (e.g., 05846 pneumatic gun) when dispensing two-part adhesive.
Position Components: Within ~60 min work time, align parts before curing sets.
Cure:
Room temperature cure: ~24 h for full strength.
Heat-accelerated cure: ~30 min at ~80 °C (175 °F).
Post-Bond Handling: Can be weld-bonded or rivet bonded while still uncured within the work time.
Safety & Handling
Common Hazard Categories
May cause skin burns and serious eye damage.
May cause allergic skin reaction.
May cause respiratory irritation and other systemic effects upon repeated exposure.
Corrosive and harmful if swallowed.
Safety Measures
Wear PPE: chemical-resistant gloves, protective clothing, eye/face protection.
Ventilation: use in well-ventilated work areas to minimize fume exposure.
Hygiene: wash thoroughly after handling; avoid eating/drinking in work areas.
Storage: keep containers closed in a cool, dry, and secure location.
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