By Asurada - 7/27/2018 1:29:12 AM
I'm trying to use PX30 to make a flexible mold, this resin is very flexible, but his tear resistance is poor, I bend it with my hand, it can bend a lot of angle, but when I twist it, it will easily break and crack.
Is this because of the properties of the resin? I can confirm that my blending ratio is no problem, why does it have such a problem? Or there are no other rubber-like resins, I would like to take to make a flexible resin mold, for casting silicone hand ring.I'm trying to use PX30 to make a flexible mold, this resin is very flexible, but his tear resistance is poor, I bend it with my hand, it can bend a lot of angle, but when I twist it, it will easily break and crack. Is this because of the properties of the resin? I can confirm that my blending ratio is no problem, why does it have such a problem? Or there are no other rubber-like resins, I would like to take to make a flexible resin mold, for casting silicone hand ring.I'm trying to use PX30 to make a flexible mold, this resin is very flexible, but his tear resistance is poor, I bend it with my hand, it can bend a lot of angle, but when I twist it, it will easily break and crack. Is this because of the properties of the resin? I can confirm that my blending ratio is no problem, why does it have such a problem? Or there are no other rubber-like resins, I would like to take to make a flexible resin mold, for casting silicone hand ring.
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By Warren (Staff) - 7/27/2018 8:18:46 AM
You are almost certainly just reaching the limit of what the resin is capable of. Twisting and tearing it putting a lot of force in multiple directions hence you can rip chunks out of it, yet with a simple bending force it bends fine.
If you compare the mechanical data you are looking at test figures of tear strength being 3.5 kN/m for the PX30 where as a good quality RTV Silicone is in the 15kN/m ball park.
So what that means is in practice a typical silicone has 4 times the tear strength, so try not to compare the PX30 directly with a silicone and just be a bit more careful during the demoulding process to avoid tearing the rubber.
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