LORD 320/322
Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other
Main features
- Primerless Automotive-SMC Adhesion
- -40 to 204 deg C Service Range
- Solvent-Free Nonflammable Epoxy
Product Description
LORD® 320/322 Epoxy Adhesive is a general-purpose, two-component epoxy adhesive formulated for primerless adhesion to automotive sheet molded compounds (SMC). It also provides excellent adhesion to prepared metals, rubber, fiberglass reinforced plastics, polyester thermosets, thermoplastics and other supported materials. The solvent-free system can be cured at room temperature or with heat for faster processing and provides durable performance across mixed-stress, high-temperature shear and low-temperature peel joint designs.
Key Features
- Primerless adhesion to automotive SMC with documented bonding to prepared metals, rubber, FRP, polyester thermosets and thermoplastics.
- Durable structural performance with impact resistance down to -40°F (-40°C) and resistance to humidity, sunlight, salt spray and temperature extremes.
- High-temperature process resistance supporting postbake exposure up to 400°F (204°C).
- Solvent-free formulation that is nonflammable and virtually odorless.
Applications / Suitable for
- Automotive sheet molded compound bonding
- Prepared metal and composite assemblies
- Fiberglass reinforced plastic, polyester thermoset and thermoplastic bonding
- Prepared natural rubber and styrene-butadiene rubber bonding
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Thermal Properties
Additional Information
As-Supplied / Before-Processing Properties
Typical component and mixed properties. Values are typical and are not intended for specification purposes.
| Property | 320 Resin | 322 Hardener | Mixed | Method / Condition |
|---|---|---|---|---|
| Appearance | Off-white paste | Grey paste | Grey paste | Typical |
| Viscosity | 300,000–1,000,000 cP | 450,000–2,000,000 cP | — | Brookfield HBF, Helipath, 5 rpm at 77°F (25°C); T-Bar D for resin and T-Bar E for hardener |
| Density | 12.5–12.9 lb/gal (1498–1546 kg/m³) |
10.33–10.54 lb/gal (1238–1263 kg/m³) |
— | Typical |
| Flash Point | >200°F (>93°C) |
>200°F (>93°C) |
— | Closed cup |
| General-Purpose Mix Ratio | 1 part | 1 part by volume 0.83 part by weight |
1:1 by volume 1.2:1 by weight |
Mixed-stress joint design; -40°F to 400°F (-40°C to 204°C) |
| High-Temperature Mix Ratio | 1.5 parts by volume 1.8 parts by weight |
1 part | 1.5:1 by volume 1.8:1 by weight |
Shear-stress joint design; 50°F to 400°F (10°C to 204°C) |
| Low-Temperature Mix Ratio | 1 part | 1.5 parts by volume 1.2 parts by weight |
1:1.5 by volume 1:1.2 by weight |
Peel-stress joint design; -40°F to 100°F (-40°C to 38°C) |
| Solids Content | — | — | 100% | Mixed adhesive |
| Working Time | — | — | 20–40 minutes | 54 g mass at 75°F (24°C) |
| Time to Handling Strength | — | — | 2–4 hours | Typical |
| Recommended Film Thickness | — | — | 0.02–0.03 in (0.51–0.76 mm) |
General use |
| Shelf Life | 2 years | 2 years | — | From date of manufacture; store at 60–80°F (16–27°C) in original, unopened containers |
After-Processing / Final-State Properties
Typical cured properties. Values are typical and are not intended for specification purposes.
| Property | Value | Unit | Method / Condition |
|---|---|---|---|
| Cure to Full Strength | Approximately 24 | hours | Adhesive, substrates and ambient temperature at 65°F (18°C) or higher |
| Accelerated Cure | 45–60 | minutes | At 180°F (82°C); bondline temperature should not exceed 325°F (162°C) |
| Cured Appearance | Grey | — | Typical |
| Tensile Strength at Break | 4440 (30.6) |
psi (MPa) |
ASTM D882-83A, modified |
| Elongation | 3 | % | ASTM D882-83A, modified |
| Young’s Modulus | 230,000 (1586) |
psi (MPa) |
ASTM D882-83A, modified |
| Glass Transition Temperature (Tg) | 176 (80) |
°F (°C) |
ASTM E1640-99, by DMA |
| Cold-Rolled Steel Lap Shear Strength | 2225 (15.3) |
psi (MPa) |
Room temperature; 72-hour room-temperature cure; 1:1 mix ratio by volume |
| Aluminum Lap Shear Strength | 1690 (11.7) |
psi (MPa) |
Room temperature; 72-hour room-temperature cure; 1:1 mix ratio by volume |
| SMC Lap Shear Strength | 620 (4.3) |
psi (MPa) |
Room temperature; 72-hour room-temperature cure; 1:1 mix ratio by volume; fiber-tear failure mode |
| Cold-Rolled Steel Lap Shear after Salt Spray | 2260 (15.6) |
psi (MPa) |
Tested immediately after 14 days of salt-spray exposure |
| SMC Lap Shear at -30°F (-34°C) | 731 (5.0) |
psi (MPa) |
Fiber-tear failure mode |
