If I'm reading your post correctly, I'd put on a fun kid course Re:. I'd gather up as many items in the different materials you want the children to learn, then go through each and explain what each is made of. To further the idea, you can compare each item with other things in and around the home.

For example... a wooden play block is the same material as the doors and surrounds in the home, the cutting block/board in the kitchen, etc, as for things made of plastic, rubber, or vinyl, a trip to the bathroom should reward you with everything needed to provide examples of, such as, the vinyl shower curtain, shampoo/conditioner bottles, the plastic packing that toilet paper is packaged in, rubber baby bottle nipples, etc.

After you've covered off putting on the course for them, quiz them and ask them to show you a toy, then something around the home that's made out of the same material.

Television shows related to wood-crafting, etc, would be ideal in covering the workability of wood in general. You could go on to further explain that wood is natural and was once alive, whereas plastics and rubbers and vinyls are often liquids that end up as solids, then show them what you have on hand in the way of juice pitchers, plastic glasses and cups, etc.

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