Flex 70 Flexible Urethane Rubber
Flex 70 is a versatile and durable urethane rubber, perfect for duplicating rubber parts or creating long-lasting rubber molds. With a shore hardness of 70A, it offers a strong yet flexible finish, making it ideal for industrial applications, prototyping, and custom mold-making.
✔ Durable & Flexible – A perfect balance of strength and flexibility for a wide range of uses
✔ Smooth, Bubble-Free Castings – Vacuum or pressure casting recommended for best results
✔ Versatile Coloring – To achieve opaque colors, mix white dye with translucent dyes
Whether you're replicating rubber parts or crafting custom molds, Flex 70 delivers the toughness and flexibility you need for high-quality, long-lasting results.
Features
✅ Flexible yet tough urethane rubber for durable molds and parts
✅ Shore hardness of 70A for a strong yet flexible finish
✅ Ideal for duplicating rubber parts or making long-lasting rubber molds
✅ Vacuum or pressure casting recommended for bubble-free results
✅ Can be colored with translucent dyes when mixed with white dye
🚫 Not suitable for applications requiring extremely soft, stretchable rubber
FAQ
What is Flex 70 best used for?
✅ Flex 70 is ideal for duplicating rubber parts and creating durable rubber molds for resin, concrete, plaster, and more.
How flexible is Flex 70?
💪 With a shore hardness of 70A, Flex 70 offers a strong yet slightly flexible finish, similar to firm rubber gaskets or tire treads.
Do I need a vacuum or pressure chamber?
🫧 While not required, vacuum or pressure casting is recommended to remove air bubbles and achieve perfectly detailed castings.
Can I color Flex 70?
🎨 Yes! Use Alumilite’s translucent dyes, but if you want an opaque color, you must mix in white dye.
How long does it take to cure?
⏳ Demold in 2 hours at room temperature, but full cure takes 72 hours. Post-curing at 120-150°F for 2 hours speeds up the process.
How should I store my urethanes to keep them in the best condition?
❄️ Store your urethanes in a cool, dark place away from direct sunlight and high temperatures, ideally between 60°F and 75°F (15°C to 24°C). Keep the container tightly sealed to prevent moisture and air from affecting the formula. Wiping the container tops before sealing can help prevent stuck caps.
What are the best conditions for pouring and displaying urethane projects?
☀️ For the best results, pour urethanes in a well-ventilated, temperature-controlled environment with humidity below 60% to prevent defects and bubbles. Once cured, keep finished projects out of direct sunlight to prevent discoloration or degradation.
Downloadable Resources
Need Help Getting Started?
Check out CASTING RESIN 101 and become a pro in no time! Have other questions? Give us a call (269-488-4000) and our team of experts will assist you.
