What do you look for in a Chemical Manufacturer?

I’m currently sourcing a chemical manufacturer and I’m curious about what other traders think is crucial when selecting one. I’ve encountered a few options, but it feels a bit overwhelming. Is it mostly about quality and compliance, or do you prioritize cost and lead times? Also, how do you handle communication and support from the manufacturer? I’ve heard that responsiveness can really make or break the experience. Any red flags I should be aware of or maybe brands you’ve had good experiences with? I’d love to get your insights and maybe avoid some common pitfalls!