EPOCAST 1656
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
- Low-Density Potting Material
- Paste Consistency for Application
- Long Work Life
Product Description
EPOCAST® 1656-A/B is a two-component, low-density epoxy syntactic compound with a thick-paste consistency and a 50–90 minute gel time at 25°C. The mixed system has a typical density of 0.80 g/cm³ and may be cured for seven days at room temperature or gelled at room temperature followed by 2–3 hours at 66°C. It is used as a core fill for metal skins to add stiffness and strength to fabricated parts and is also suitable for core splicing and reinforcing radii and corners in reinforced-plastic structures. EPOCAST® 1656-A/B meets GM-4006-1-2 requirements.
Key features
- Low-density mixed system: Typical mixed density of 0.80 g/cm³ supports lightweight structural filling applications.
- Thick paste with long work life: Paste consistency is combined with a typical 50–90 minute gel time for a 100 g mass at 25°C.
- Temperature-dependent strength data: Cured compressive-strength results are documented from −55°C to 177°C.
Applications / Suitable for
- Core filling for metal skins in fabricated structural parts
- Core splicing
- Strengthening radii and corners in reinforced-plastic structures
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Additional Information
As-supplied / before-processing properties
Typical as-received and processing data. Component order is Part A resin / Part B hardener / mixed system where multiple values are shown.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Color | Light tan / amber / light tan | — | Part A / Part B / mixed; visual |
| Density | 0.80 / 1.00 / 0.80 | g/cm³ | Part A / Part B / mixed; ASTM 1622 |
| Viscosity or consistency | Part A: paste; Part B: 500 cP; mixed: paste | — | 25°C; ASTM D2196 |
| Gel time | 50–90 | min | 100 g mixed mass at 25°C; ASTM D2471 |
| Mix ratio by weight | 100:12 | parts | Part A resin : Part B hardener |
| Material temperature before mixing | Above 18 | °C | Condition both components before mixing |
| Cure schedule | 7 days at 25°C; or gel at 25°C followed by 2–3 hours at 66°C | — | Supplier-listed cure options |
| Shelf life | 6 | months | Unopened at 25°C; store sealed and dry at 2–40°C away from direct sunlight |
After-processing / final-state properties
Typical cured properties provided for product evaluation and not for specification purposes. Values apply only to the listed test methods and conditions.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Tensile lap shear | 700 (4.8) | psi (MPa) | ASTM D1002; etched aluminum/aluminum; 25°C |
| Compressive strength at −55°C | 9,500 (65.5) | psi (MPa) | ASTM D695; measured at 2% strain |
| Compressive strength at 25°C | 8,000 (55.2) | psi (MPa) | ASTM D695; measured at 2% strain |
| Compressive strength at 83°C | 3,000 (20.6) | psi (MPa) | ASTM D695; measured at 2% strain |
| Compressive strength at 177°C | 550 (3.8) | psi (MPa) | ASTM D695; measured at 2% strain |
| Flatwise tensile strength at 23°C | 2,000 (13.8) | psi (MPa) | ASTM C297 |
| Flatwise tensile strength at 71°C | 1,000 (6.9) | psi (MPa) | ASTM C297 |
