Araldit CY221 Epoxy Casting Resin for Prosthetics

Product Description

Araldit CY221 – Low-Viscosity Epoxy Casting Resin

Its easy-pour consistency makes it well suited to intricate moulds and detailed cavities, while its formulation allows for high filler loading when you need to tailor performance for specific applications.

Why choose Araldit CY221

• Low viscosity for easy casting: Flows well into complex shapes, helping reduce voids and improving mould detail.
• Unfilled resin with high filler acceptance: Can be combined with suitable fillers to modify properties such as stiffness, density, or impact behaviour.
• Good crack resistance: Helps reduce the risk of brittle failure in demanding environments.
• Thermal ageing resistance: Supports long-term durability where temperatures may vary during use or storage.
• Room-temperature cure options: Suitable for ambient curing when used with compatible hardeners.

Typical applications

• Epoxy casting: General purpose casting of components requiring good mechanical performance.
• Encapsulation & potting: Encapsulating or potting components for protection and stabilisation.
• Mould work: Casting into detailed moulds where controlled flow and fill are important.
• Custom formulations: Can be blended with fillers to achieve tailored properties for specialised industrial use.

Use in prosthetics & orthotics workflows

While Araldit CY221 is not a prosthetics-only resin, its flow characteristics, crack resistance, and ability to be modified with fillers can make it a practical option for certain prosthetics and orthotics workshop tasks - such as creating moulded parts, forming tooling, or potting/encapsulating components where controlled mechanical behaviour is needed. 

As with any resin system, suitability depends on the exact formulation, curing conditions, and intended load/environment, so application-specific testing is essential.

Compatible hardeners (room-temperature cure)

• HY 2966
• HY 2967

Use only compatible hardeners and follow the manufacturer’s mixing ratios and processing guidance to achieve the correct cure and performance.

Handling & safety guidance

• Wear PPE: Protective gloves and eye protection are recommended during mixing and handling.
• Ventilation: Use in a well-ventilated workspace to minimise exposure to vapours.
• Skin sensitivity: Epoxy systems can be irritants and sensitisers; avoid skin contact and follow local safety procedures.
• Verify suitability: Always validate performance for your specific application, particularly for critical components.

At-a-glance

Note: Processing performance and final properties depend on the hardener selection, mixing ratio, filler type/level, and cure conditions. Always consult the relevant technical datasheets and safety documentation before use.