These different series of plastics are characterized by their suitability for direct patching/compression without the need for any additives (including water). Heating can be started immediately after installation, and there is no need for curing. Compared to castable plastics of the same thickness, the heating time is shorter. Fast-heating plastics are available when required. These are widely used in the repair and construction of metal contact linings (e.g., spouts, ladles, boilers, wash chutes, etc.); fast-heating blocks for ferronickel tapholes (ZRP) in electric arc furnaces. Phosphorus-Free Plastics (HRP) can be used in extremely low-phosphorus applications.