I plan to use a polypropylene screw block inside a PVC extrusion. Will there be a reaction when the materials are in constant contact?

I've never heard of plastics reacting with each other.

I had soft plastic artificial fishing worms melt their way through the drawers in my tackle box.

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Originally Posted by bweber

I had soft plastic artificial fishing worms melt their way through the drawers in my tackle box.

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Hmmmm... you learn something new every day. I've had chemistry class in the past, and I've known a lot of guys that fish and never heard of that. Maybe it's the right combination of plastics. Like the perfect storm.