Most waterjet cutting machines use abrasive components with steam. They are ideal for cutting hard materials. For example, rock, glass, metals will need abrasive for a precise cut. Garnet is the most used abrasive because it's tough and more available.u003cbr/u003eu003cbr/u003eBut abrsavie is not mandatory for cutting all types of components. If you are cutting soft and medium-hard materials such as foam rubber, you can use a pure water jet machine.u003cbr/u003ePure water jet machines do not use any abrasives. Instead, they use pure water, and the water used in this process is reusable.