What substances are covered by COSHH assessments?

Assessments related to COSHH address a variety of substances that could pose risks in the workplace such, as chemicals and their products along with fumes and dust particles that can be harmful through inhalation or contact with skin or ingestion like cleaning agents and paints as welding fumes and flour dust are all included in this category. Things like asbestos lead and radioactive materials are subject, to regulations. If you're unsure, about a substances safety and it displays a hazard symbol chances are that it requires a COSHH evaluation.
Is it possible for me to delegate the testing of chemicals to a party? 
When dealing with the outsourcing of materials, for testing purposes is a practice among many businesses for sure.
Implementers can turn to firms and labs that provide these services along with their knowledge and cutting edge tools. Outsourcing serves as a method to meet standards such as COSHH without the need to purchase costly equipment or provide specialised training for employees. It may also prove to be a budget option particularly when there isn't a continuous demand, for testing services. These professionals also keep themselves informed about the rules and examination techniques you should select a reliable service provider, with appropriate certifications Be aware that even if you subcontract the testing duties you hold accountability, for ensuring overall workplace safety Thus it is essential to collaborate closely with the testing firm to understand findings and enforce any crucial safety measures.