* PVC resin (such as PVC homopolymer or PVC copolymer)

* Plasticizer (such as DOP, DINP, DIDP, DOA, etc.)

* Heat stabilizer (such as lead stabilizer, calcium/zinc stabilizer, barium/zinc stabilizer, etc.)

* Lubricant (such as stearic acid, polyethylene wax, etc.)

* Filler (such as calcium carbonate, talc, clay, etc.)

* Colorant (such as pigments or dyes)

* Other additives (such as flame retardants, anti-UV agents, etc.)

Steps for making soft PVC compound

1. Premix the PVC resin with a portion of the plasticizer, heat stabilizer, filler, and pigment in a high-speed mixer.

2. Melt the mixture in an extruder at a temperature of 150-200°C.

3. Add the remaining plasticizer and other additives to the molten mixture and mix thoroughly.

4. Cool the mixture and pelletize it.

Note: The exact ingredients and processing conditions for making soft PVC compound may vary depending on the desired properties of the final product.