Generally, all substance expand on heating. Does rubber or plastic contract on heating. ​

In general, most substances, including rubber and plastic, expand when heated. This is because heating increases the kinetic energy of the particles, causing them to move more vigorously and occupy a greater volume.

However, there are some special types of rubber and plastic materials that exhibit an unusual behavior known as thermal contraction. These materials are referred to as "negative thermal expansion" materials. They have unique structures or arrangements of particles that cause them to contract or shrink when heated.