Orders with hazardous/dangerous goods need special packing instructions and paperwork preparing for some couriers and destinations. There is no easy way to identify orders with hazardous goods on them or batch them separately this means we can't ensure we meet the legal requirements for how we handle these.
Would need some maintenance but could be achieved with order rules module. If you allocated every product with a UN number to a "hazardous" product category, then you could automatically tag every order with a "hazardous" tag, and then filter by this on the batch screen