A ‘filler’ is an example of a plastic additive. What properties must a suitable filler materialhave?

A suitable filler material for plastic additives must have the following properties:

1. Compatibility: The filler material should be compatible with the plastic material. It should not react chemically with the plastic or alter its properties in an undesirable way.

2. Stability: The filler material should be stable under the processing conditions of the plastic. It should not decompose or react under the temperatures and pressures used in plastic processing.

3. Cost-effectiveness: The filler material should be cost-effective. It should not significantly increase the cost of the plastic product.

4. Enhance Properties: The filler should enhance the properties of the plastic, such as its strength, durability, heat resistance, etc.

5. Non-toxicity: The filler material should be non-toxic, especially if the plastic product is to be used in food packaging or other applications where it may come into contact with humans or animals.

6. Consistency: The filler material should have a consistent quality and composition. This ensures that the properties of the plastic product are also consistent.

7. Environmental Impact: The filler material should have a minimal impact on the environment. It should be recyclable or biodegradable, and its extraction or production should not cause significant environmental damage.