One afternoon, we received a call from one of our long-time customers.
His voice sounded a little anxious:
"The samples this time don't seem right. The print surface is still tacky, and even after a whole night, it hasn't dried."
As we reassured him, we asked about the details of the process.
It didn't take long to find the cause - during this sampling run, he was supposed to use self-curing silicone, but had instead used the additives and thinner designed for heat-curing silicone.
To the untrained eye, self-curing and heat-curing silicones can look very similar - both are semi-transparent or milky pastes, and even feel similar when mixed. But in reality, their formulation systems are completely different.
Self-curing silicone relies on curing at room temperature. Its additives and thinner are designed to activate the reaction in low-temperature environments, allowing the silicone to gradually form a film and harden.
Heat-curing silicone, on the other hand, is formulated for high-temperature curing - its additives remain "dormant" at room temperature and only activate under heat from baking or heat-pressing.
That means mixing them will disrupt the curing process.
In this case, the customer's samples ended up with a tacky surface, incomplete curing inside, and reduced adhesion - a serious problem if it had gone into mass production.
In fact, the two silicones also serve different application needs:
Self-curing silicone is ideal for small-batch sampling, temperature-sensitive fabrics, or environments where heating is not possible.
Heat-curing silicone is better for high-efficiency, large-scale production on heat-resistant fabrics.
But whichever type is chosen, it's essential to use the correct matching additives and thinner.
It's like a lock and key - only the right key will open the lock, and the wrong one can damage it.