Silicone Lube and IUDs?

We know that silicone lube is not safe for toys which are not 100% silicone (but have some silicone in them), but what about other devices?

Q: Why is there powder on my condom?

Q: I opened up a non-lubricated Trojan condom and there was powder on the inside! What the hell is it? Is my condom defective?