LOCTITE CAT 21
Harmonization Code : 8529.90 | Parts solely or principally used for TV, radio, and transmission
Main features
- Low-Viscosity Polyoxyalkylene Amine Curative
- One-Hour Pot Life
- Large-Mass Epoxy Castings
Product Description
LOCTITE® CAT 21 is a low-viscosity polyoxyalkylene amine curing agent designed for use with compatible epoxy resin systems. The hardener is particularly suited for large-mass casting applications and provides excellent impact resistance, thermal shock resistance and non-crystallizing storage stability. It can be cured at room temperature or with elevated-temperature post-curing and delivers reliable performance in epoxy systems operating across a broad temperature range.
Key Features & Benefits
- Polyoxyalkylene amine epoxy curing agent.
- Low-viscosity formulation for easy processing.
- Non-crystallizing during storage.
- Suitable for large-mass epoxy castings.
- Good impact resistance after cure.
- Good thermal shock resistance.
- Supports room-temperature and heat-cure schedules.
Recommended Applications
- Large-volume epoxy casting systems.
- Industrial encapsulation and potting.
- Electrical and electronic resin systems.
- Applications requiring thermal shock resistance.
- General-purpose epoxy curing applications.
TDS, SDS & Technical Documents
Technical Specifications
No specifications available.
Additional Information
Technical Properties
As-Supplied / Before-Processing Properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Technology | Polyoxyalkylene Amine | — | Epoxy Curing Agent |
| Appearance | Dark Amber | — | As supplied |
| Viscosity | 65 | mPa·s (cP) | 25°C |
| Specific Gravity | 1.03 | — | 25°C |
| Pot Life (100 g Mass) | 1 | hour | 25°C |
| Shelf Life | 548 | days | 25°C storage |
| Cure Type | Room Temperature or Heat Cure | — | Recommended process |
Technical Properties
After-Processing / Final-State Properties
| Property | Value | Unit | Condition / Method |
|---|---|---|---|
| Recommended Cure Schedule | 16 - 24 | hours | 25°C initial cure |
| Post Cure | 6 | hours | 65 to 85°C |
| Continuous Operating Temperature | -65 to +120 | °C | Typical cured epoxy system |
| Impact Resistance | Good | — | Product characteristic |
| Thermal Shock Resistance | Good | — | Product characteristic |
| Large Mass Casting Capability | Yes | — | Designed for large epoxy castings |
| Crystallization Resistance | Non-Crystallizing | — | Storage characteristic |
