Silicone Putty Can Not Be Cured Properly?
If the silicone putty remains soft and does not capture the shape of your master mold, it likely hasn’t cured properly—often due to external factors. Don’t worry! Let’s explore some common causes and solutions together:
Why doesn't silicone putty cure properly?
The primary reason silicone putty fails to cure properly is due to a combination of chemical and physical factors. The main issues include insufficient mixing (the most significant contributor), incorrect mixing ratio, temperature and humidity effects, contact with unsuitable materials that inhibit curing, expiration of the product, and improper storage.
How can we prevent silicone putty from curing improperly?
1. Insufficient mixing (main cause)
The manual mixing process usually takes about 3 to 5 minutes. The technique involves repeatedly stretching, folding, and flattening the mixture to ensure that all parts are thoroughly combined. After mixing, it is advisable to cut a thin slice and flatten it to check for any uneven colors, confirming that it is evenly mixed.
2. Correct mixing ratio
Mix the silicone putty 1：1 by weight with a scale.
3. An appropriate working humidity and temperature
- Temperature > 20°C
- Humidity > 50%
4. Avoid contact with unsuitable materials that inhibit curing
- Gloves: Use clean nitrile gloves that are sulfur-free, clearly marked "Sulfur-Free, Platinum Cure Safe".
- Environment: Keep the working area free from rubber products, cosmetics, uncured resin, and other items containing sulfur or amines.
5. A suitable storage condition
Please store the silicone putty in a sealed container and keep it in a dark place. And it may harden and spoil if not properly sealed. If you notice that the silicone putty has become clumpy, settled, or moist, it is no longer usable.
How to salvage silicone putty that didn't cure properly?
Unfortunately, when silicone putty has a cure inhibition, it will not cure properly, and there is no way to reverse this.