This thread cracks me up. Unless you're running pharma, your gear is made from cheap raws sourced from China. The Cheaper the finished product, the cheaper the raws. The Cheaper the raws, the more contaminants and heavy metals in them. That is far more likely of a concern than chemicals leeching from your plastic syringe into your gear. If you're using dirt cheap gear, it's likely purchased from a low end compounding company in Hong Kong.
You get what you pay for in most cases. That said, very few UGL are buying premium raws. The price differences, for the most part, are just variance in profit margin from UGL to UGL. I do believe some of the larger top tier international UGL do get a better deal from more reputable compounders and make an effort to source quality raws of a larger scale. These tiny stateside UGL selling test for 30 bucks are using the cheapest raws they can find. Do you really want to skimp on shit you're injecting into your body? Heavy metal issues are very real with crap raws... not to mention purity/quality and thus underdosed finished product.