Amazing Mold Rubber (Flex)
Amazing Mold Rubber FLEX
Formerly known as Amazing High Strength 3. Same trusted formula—fresh new name.
Amazing Mold Rubber FLEX (formerly Amazing High Strength 3) is the same ultra-durable, flexible silicone you’ve always trusted—now with a new name that says exactly what it does: FLEX.
This fast-curing, high-performance silicone is designed to tackle the toughest molds, especially those with deep undercuts or intricate details. It captures texture beautifully, cures to a flexible pink rubber, and doesn't require a vacuum chamber. Perfect for one-piece or multi-part molds, FLEX bends without breaking and holds strong through repeated use.
Shipping Note: The 50lb size is made to order and may require additional lead time.
Features
✅ Fast Demold Time:
Ready to demold in just 2–4 hours, full cure in 7 days
✅ No Vacuum Needed:
Low viscosity formula captures fine details without degassing
✅ High Tear Strength:
Withstands rips and stretching—400 pli tear resistance
✅ Perfect for Complex Molds:
Ideal for intricate details and tricky multi-part designs
✅ Easy to Use:
Simple 10:1 mix ratio by weight with 45-minute working time
🚫 Not Food or Skin Safe:
For artistic and industrial use only—not suitable for direct food or skin contact
🚫 Softer Than High Shore Rubbers:
More flexible than options like Flex 70 or 80—better for stretch, not rigidity
FAQ
Is this the same product as Amazing High Strength?
🆕 Yes! Amazing Mold Rubber Flex is the exact same formula you know and love—it’s just been rebranded with a name that highlights its key strength: flexibility.
What’s the mix ratio?
⚖️ 10:1 by weight. A digital gram scale is best for accuracy.
Do I need a vacuum chamber?
💨 Not unless you’re going for ultra-dense pours. Amazing mold Rubber Flex is designed to work beautifully without degassing.
How fast can I demold?
⏱️ 2 to 4 hours. Full cure happens in 7 days.
Can I use this for multi-part molds?
🔄 Absolutely. Just make sure to use a mold release (like Mold Release & Conditioner or Amazing Mold Release) between silicone layers so they don’t bond together.
Will Amazing Mold Rubber Flex pick up fine details?
🔍 Yes! Its low viscosity lets it flow into tight spaces and capture even the smallest textures.
Can I use it for skin or food contact?
🚫 No, Amazing Mold Rubber Flex is not certified for skin or food-safe applications.
How do I extend mold life?
🛡️ Use a silicone-safe mold release and don’t let castings sit in the mold too long.
Need Help Getting Started?
Check out Mold Making 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.
Need It Today?
Find us in store at your favorite local retailers! Be sure to check with your local store for product and stock options. Now available at:
Compare Silicones
Need Help Getting Started?
Your cart is currently empty.
Start Shopping
