There is no single universal “formula” for making plastic, as it depends on the type of plastic being produced. However, a general formula includes the following components:

• Base Polymer (60–95%): This could be polyethylene, polypropylene, PVC, etc.

• Additives (5–40%): These include:

  • Fillers (e.g., calcium carbonate, talc)

  • Stabilizers (for heat and UV resistance)

  • Plasticizers (for flexibility)

  • Pigments (for color)

  • Lubricants (for processability)

For example, a typical formula for rigid PVC might look like this:

• 100 parts PVC resin

• 25 parts calcium carbonate

• 5 parts impact modifier

• 2 parts heat stabilizer

• 1 part lubricant

• 1 part pigment

This composition is fed into a compounding extruder, where it is melted, mixed, and formed into granules or sheets. The formulation varies by product type—flexible films, rigid containers, or technical parts all require different ingredient ratios.