Working on this as a thought leadership page…
Testing Labs
Fike: https://www.fike.com/capabilities/testing/
Lewellyn: https://lewellyn.com/combustible-dust-testing/
Fauske: https://www.fauske.com/chemical-industrial/testing/combustible-dust
Dekra: https://www.dekra.us/en/process-safety-testing/combustible-dust-testing/
Jenson Hughes: https://www.jensenhughes.com/engineering-services/research-and-development/testing-capabilities/dust-testing/
Reference Materials
Eckoff, Rolf. 2003. Dust Explosions in the Process Industries