I don't solder so I take everyone's word that this mat is heat resistant. But I work a lot with small parts and tiny screws. This rug fulfills two simple functions. The silicone rubber cushions anything that falls on it. That means things won't bounce off your hard work surface and fall to the floor. The rug has a tiny hem that runs all the way around the edge. That means things won't roll off your hard work surface onto the floor. (I'm telling you, small screws!) If this rug saves you the frustration of having a single screw fall to the floor, it's worth it. A limitation. This rug will cut if you press anything sharp on it. So pay attention to where your blade is when you disassemble your knife. But a small amount of all-purpose plastic glue should cure any joint.