Quick Answer
What is the difference between water jet and abrasive jet cutting? Pure water jet cutting uses only high-pressure water and is best suited for soft materials like rubber, foam, and sponge. Abrasive jet cutting adds fine garnet particles to the stream, multiplying cutting power for hard materials like metal and composites. Mid-Atlantic Rubber operates both systems and selects the right one based on your material and part requirements.
When most people hear “water jet cutting,” they picture a single technology. In practice, there are two distinct variations of the process, and they are suited to different materials and applications. Pure water jet cutting and abrasive jet cutting share the same underlying principle but are used in different situations. Understanding the difference helps you ask the right questions when you are sourcing a custom part.
At Mid-Atlantic Rubber, we run both systems. Here is how they differ, what each one is best at, and how we decide which one to use for your job.
How Does Pure Water Jet Cutting Work?
Pure water jet cutting uses an extremely high-pressure stream of water, typically pressurized to between 30,000 and 90,000 PSI, to cut through material. The water is forced through a small nozzle orifice, accelerating it to supersonic speed. That concentrated stream cuts through soft materials cleanly and quickly without generating heat.
The key word there is soft. Pure water jet is the right tool when the material can be cut by water pressure alone. Rubber, foam, sponge, open-cell and closed-cell foam, soft composites, and similar materials are well within its capability. The cut is clean, the edges are precise, and there is no thermal stress on the material because no heat is involved.
For gasket and sealing applications, this matters a great deal. Rubber and foam materials can change their properties at the cut edge if heat is introduced. Pure water jet preserves material integrity right to the edge of the cut.
How Is Abrasive Jet Cutting Different?
Abrasive jet cutting starts with the same high-pressure water stream but adds one critical ingredient: fine abrasive particles, typically garnet, mixed into the stream just before it exits the nozzle. The abrasive dramatically increases the cutting power of the jet, allowing it to erode through hard materials that water alone cannot penetrate.
Abrasive jet cutting produces no heat-affected zone, no warping, and no material hardening at the cut edge, which is one of the reasons it is preferred over plasma or laser cutting for materials where those thermal effects are a concern.
What Materials Does Each Process Handle?
Pure Water Jet Is Used For:
- Rubber including neoprene, EPDM, nitrile, silicone, and natural rubber
- Foam including open-cell foam, closed-cell foam, and sponge up to 8 inches thick
- Soft composites and laminates
- Cork and cork-rubber blends
- Thin, soft plastics
Abrasive Jet Is Used For:
- Aluminum, stainless steel, carbon steel, and other metals
- Titanium and hardened alloys
- Thick engineering plastics including PTFE and high-density polyethylene
- Fiberglass, carbon fiber, and composite laminates
- Ceramics and stone
Both processes can cut material up to 8 inches thick depending on material density and required tolerances. Both operate without generating heat at the cut edge. Both cut directly from a digital drawing file with no die required.
Why Does the Distinction Matter for Custom Parts?
If you are ordering from a manufacturer that only runs one type of system, you may not get the best result for your specific material. Running both systems lets us match the process to the part rather than the other way around. When you send us a drawing for a foam seal and a stainless shim on the same order, we handle both in-house on the right equipment from the same drawing files.
Are There Any Other Cutting Processes MAR Uses?
Beyond water jet and abrasive jet, we also operate laser and tube cutting machines for metal profiles and structural shapes, and CNC machining for parts with complex geometries and tight tolerances. Together, these capabilities let us tackle nearly any custom fabrication job that comes through the door.
How Does MAR Decide Which Process to Use for Your Part?
The decision comes down to three things: your material, your part geometry, and your required tolerances. When you submit a drawing, our team reviews those factors and selects the process that produces the best result for your specific job. We will tell you what we are using and why.
Ready to Talk About Your Custom Cutting Job?
Whether your part is rubber, foam, metal, or something in between, the team at Mid-Atlantic Rubber can help you figure out the right approach. Send us your drawing and we will take it from there.
Contact MAR to Discuss Your Cutting Project
Frequently Asked Questions About Water Jet vs. Abrasive Jet Cutting
What is the difference between water jet and abrasive jet cutting?
Pure water jet uses only high-pressure water and is suited for soft materials like rubber, foam, and sponge. Abrasive jet adds fine garnet particles to the stream to cut harder materials including metals, composites, and engineering plastics. Both are cold-cutting processes with no heat-affected zones.
Which materials require abrasive jet cutting instead of pure water jet?
Abrasive jet is used for metals including aluminum, stainless steel, and carbon steel, as well as composites, ceramics, and thick engineering plastics. Pure water jet is the right choice for rubber, foam, sponge, soft composites, and similar materials.
Does MAR operate both water jet and abrasive jet cutting systems?
Yes. Mid-Atlantic Rubber in Fredericksburg, Virginia, operates both pure water jet and abrasive jet systems and selects the appropriate cutting method based on the material and geometry of each customer’s part.
Do both water jet and abrasive jet cutting require a die?
No. Neither process requires a die. Both cut directly from a digital drawing file. There is no die purchase, no design fee, and no setup charge on MAR’s water jet and abrasive jet orders.