Glass units buy raw material continuously
Soda ash, silica, cullet, colouring compounds and packing material go into a furnace that runs without stopping, which means the buying is continuous rather than project-based. A unit that runs short does not pause, it buys somewhere else that morning. Minimum levels on the fast raw materials matter more to a supplier here than almost any report, because a stockout costs the account rather than the sale.
Weight, grade and consistency
Raw material for glass is bought by weight and judged on consistency, and a batch that behaves differently in the furnace is a complaint that costs a customer real production. Recording grade and batch on the purchase and the sale is what lets you trace that back to a supplier lot, and forward to every unit that received it — which in this trade is the difference between a contained problem and an unquantifiable one.
Small units, running accounts
The customer base is dozens of small production units buying every week and settling on their own cycle, which is exactly the pattern that grows unnoticed. Because the ledger builds itself from the billing there is no second entry, and a monthly statement settles each account while the production run is still fresh for both sides.
Packing, breakage and despatch
Finished glass and bangles leave in packing that is itself a cost, and breakage in transit lands somewhere. Charging packing on its own line keeps your material price comparable, and recording breakage as a stock adjustment with the reason turns an absorbed loss into a monthly figure that usually points at one route or one handling practice.