In heat staking, a compression probe is heated to form a head on a thermoplastic stud. This widens the application of staking to a broader spectrum of thermoplastic materials than is possible with cold staking, including glass-filled materials. The quality of the joint is dependent on control of the processing parameters: temperature, pressure and time - a typical cycle time being between 1 and 5 seconds. Heat staking has the advantage that parts can be disassembled. It also has the flexibility to allow the simultaneous formation of a large number of studs and to accommodate a variety of stud head designs. There are four main methods to stake: hot air/cold stake, ultrasonic stake, direct contact stake, and infrared stake.