Is increasing the price of a product when payment is deferred or delayed considered forbidden usury (riba), especially if the product is a raw material used in another industry?

If the intended increase in price is due to selling by installments, then there is no objection, provided that the contract is settled upon a specific price. However, if the increase is due to late payment, then this is usury (riba), which is forbidden, and there is no difference in the ruling whether the commodity is raw or manufactured.