Loctite EA 937.7
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
- 2,000-Cycle Thermal-Crack Resistance
- 124 MPa Compressive Strength
- 5 mil Low-Slump Moldable Shim
Product Description
LOCTITE® EA 9377 AERO is a two-component epoxy paste adhesive formulated as a moldable plastic shim for aerospace assemblies. The low-slump material can produce shim sections as thin as 5 mil and cures at room temperature, with accelerated thermal curing available for small mixed masses. Its cured properties include high compressive strength and resistance to visible microcracking through a documented 2,000-cycle thermal-cycling sequence. The adhesive develops handling strength after 24 hours at 77°F (25°C) and may be fully cured in 5–7 days at the same temperature or in 1 hour at 180°F (82°C). It is qualified to BMS 8-338.
Key features
- Thermal-cycling resistance: Little or no cracking visible to the unaided eye after a documented sequence totaling 2,000 thermal cycles.
- High compressive performance: Typical compressive strength at 2% strain is 18.0 ksi (124 MPa) at 77°F (25°C).
- Controlled shim application: Low-slump consistency supports moldable plastic shim sections down to a minimum thickness of 5 mil.
Applications / Suitable for
- Moldable plastic shim applications in aerospace assemblies
- Thin shim sections requiring a minimum thickness down to 5 mil
- Assemblies exposed to repeated thermal cycling
TDS, SDS & Technical Documents
Technical Specifications
Physical Properties
General Properties
Additional Information
As-supplied / before-processing properties
Typical component, mixed-material, storage, working-time, and cure information for LOCTITE® EA 9377 AERO.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Product type | Two-component epoxy paste adhesive and moldable plastic shim | — | As supplied |
| Color | Part A: Gray; Part B: Black; Mixed: Dark gray | — | Visual |
| Viscosity, Part A | 2,200 | Poise | 77°F; Brookfield HBT, spindle 7 at 20 rpm |
| Viscosity, Part B | 890 | Poise | 77°F; Brookfield HBT, spindle 6 at 20 rpm |
| Viscosity, Part A | 220 | Pa·s | 25°C; Brookfield HBT, spindle 6 at 2.1 rad/s |
| Viscosity, Part B | 89 | Pa·s | 25°C; Brookfield HBT, spindle 5 at 2.1 rad/s |
| Density | Part A: 1.55; Part B: 1.08; Mixed: 1.44 | g/mL | As supplied and mixed states |
| Mix ratio | 100:19 | Parts by weight | Part A:Part B; volume measurement is not recommended for structural applications |
| Pot life | 60 | minutes | 100 g mass at 77°F (25°C); ASTM D2471, water bath |
| Handling strength time | 24 | hours | At 77°F (25°C); full bond strength has not yet been attained |
| Room-temperature cure | 5–7 | days | At 77°F (25°C) |
| Example accelerated cure | 1 hour at 180°F (82°C) | — | Provides complete cure; accelerated cures up to 200°F (93°C) are stated for small masses only |
| Minimum shim thickness capability | 5 | mil | Minimum stated shim thickness |
| Shelf life, Part A | 6 months; 3 months | — | 6 months at <40°F (4°C); 3 months at <77°F (25°C) |
| Shelf life, Part B | 12 months | — | At either <40°F (4°C) or <77°F (25°C) |
| Available dispensing format | 6 oz barrier-type Semkits® | — | Documented packaging option for dispensing |
After-processing / final-state properties
Typical cured mechanical and thermal-cycling performance. Values depend on the stated cure, substrate, specimen, test method, and test temperature.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Tensile lap shear strength | 2,300 | psi (15.8 MPa) | ASTM D1002; tested at −67°F (−55°C); 2024-T3 bare aluminum; cured 5 days at 77°F (25°C) |
| Tensile lap shear strength | 2,300 | psi (15.8 MPa) | ASTM D1002; tested at 77°F (25°C); 2024-T3 bare aluminum; cured 5 days at 77°F (25°C) |
| Tensile lap shear strength | 2,100 | psi (14.5 MPa) | ASTM D1002; tested at 190°F (88°C); 2024-T3 bare aluminum; cured 5 days at 77°F (25°C) |
| Shore D hardness | 85 | Shore D | After 72-hour cure at 77°F (25°C) |
| Compressive modulus | 904 | ksi (6,234 MPa) | ASTM D695; tested at 77°F (25°C); cylindrical specimen 0.5 in (12.7 mm) diameter × 1 in (25.4 mm) |
| Compressive strength at 2% strain | 18.0 | ksi (124 MPa) | ASTM D695; tested at 77°F (25°C); cylindrical specimen 0.5 in (12.7 mm) diameter × 1 in (25.4 mm) |
| Compressive modulus | 400 | ksi (2,759 MPa) | ASTM D695; tested at 190°F (88°C); cylindrical specimen 0.5 in (12.7 mm) diameter × 1 in (25.4 mm) |
| Compressive strength at 2% strain | 8.0 | ksi (55 MPa) | ASTM D695; tested at 190°F (88°C); cylindrical specimen 0.5 in (12.7 mm) diameter × 1 in (25.4 mm) |
| Thermal-cycling performance | Little or no cracking visible to the unaided eye | — | 12 hours at 120°F (49°C) condensing humidity; 1 hour at −67°F (−55°C); 400 cycles between −67°F (−55°C) and 160°F (71°C) at 36 minutes per cycle; sequence repeated five times for 2,000 cycles |
| Qualification | BMS 8-338 | — | Qualification stated in the July 2013 Technical Process Bulletin |
