Is silicone based TPR safe to keep out in a car?

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I wouldn't risk it. Pure silicone is very heat-resistant, but silicone mixes, like TPR silicone, often only have a teeny-tiny amount of silicone in them and aren't nearly as durable. It might be okay, but at the same time don't be surprised if it melts.

If you want to try it, I'd say make sure that it's either not a favorite toy, or at least one that's inexpensive to replace, just in case.

I'd be worried that the temperature (either extremely hot or extremely cold) would possibly cause damage, made of TPR or not.

Depends on the temperature and where you put it. We live in Florida and haven't had trouble with too many toys being left in the car, UNLESS it gets above 85 degrees or so outside. Mind you, we stick most of ours in the glove box or console.
You want to be careful that you don't keep it anywhere that heat from the floorboards can get to it, and DO put it in a Ziploc bag in any case. Not just for cleanliness reasons, but toys like that will usually leach their colors long before they start to melt or deform.

Meh I'm not too worried about it, thought I'm going to feel bad about being a toy murderer. I never even used the toy because I don't really like it. I guess I should move it to the glove box if it fits. It's in it's plastic casing so didn't put it in a bag. "If it gets even above 70 inside your car" well it's 73 outside now lol under 70 in the spring time is pretty dang cool 0_o