Water droplets appear on the surface of rubber products | How to handle "frost spitting"

Many rubber product manufacturers may encounter this problem, which is that during the rainy season in summer, many silicone rubber products, such as rubber sheets and shoe soles, will show water droplets. After the water droplets evaporate, the surface will also show spots and white spots, similar to the phenomenon of "frost spitting"

The main reason for the appearance of water column frost on the surface of rubber products is due to the excessive use of alcohols, especially diethylene glycol DEG; Because DEG has a strong hygroscopic side effect. When the dosage of DEG in the formula is too high, it will absorb moisture, especially in summer or rainy season. So there are more types of situations in summer.

The so-called "spitting frost" is: after moisture absorption on the surface of rubber products, water droplets will dissolve the water-soluble substances in the formula; After the water evaporates, water-soluble substances remain on the surface of the rubber. These white dots can be wiped off by hand.

So, if you want to fundamentally solve the problem of water droplets on the surface of rubber products, the most important thing is to start from the formula, such as changing the formula or paying attention to the amount of alcohol used. Secondly, rubber products can be placed in a dry and ventilated environment to ensure their dryness.