A steel job runs cleanly, then a cast iron job puts a different load on the same coolant system. Before ordering the next container, look at what the shop needs from the fluid: the materials you cut, the operations you run, your water and the maintenance your team can keep up with. Those details help you choose a product worth trying.
Tech Tool carries Oemeta UNIMET AS 260, a water-miscible metalworking fluid. This guide helps you plan a trial, get the right mixing information and compare the result before moving more machines to the product. Use the worksheets to organize your shop's evaluation; they contain suggested checks, not manufacturer specifications or product test results.
Where Oemeta UNIMET AS 260 fits
Oemeta’s current U.S. product page identifies steel and gray cast iron, with drilling, turning, milling and grinding among the listed applications. It describes the formulation as bactericide-free and emphasizes wetting, rinsing, corrosion protection and fluid stability. Its recommended concentration is application-dependent. These statements establish a starting point for selection; they do not qualify every alloy, machine or cutting condition. See Oemeta’s current UNIMET AS 260 information.
Tech Tool lists the product as a semi-synthetic fluid. The UNIMET AS 260 product page provides the available package options and the direct purchasing path. Before selecting a package, define the initial charge, expected replenishment and trial scope so that the purchase supports the evaluation.
A useful initial application description is specific: “turning this steel grade, with this insert and delivery system, followed by this wash and hold period.” “General machining” leaves too much unresolved. Include the hardest operation in the intended workload, rather than describing only the easy job that runs most often.
Five checks before choosing UNIMET AS 260 coolant
- Confirm the material and operation: identify the exact steel or gray cast iron grade, cutting process and part requirements.
- Get the current concentration recommendation: obtain a starting target, operating limits and approved adjustment method for your application.
- Match the fluid to the water and machine: provide water information, delivery arrangement, filtration and reservoir details.
- Define the trial evidence: decide how part quality, tool consumption, cleanliness and fluid use will be compared.
- Price the result per acceptable part: include labor, disposal and interruptions alongside concentrate expense.
Separate product documentation from application approval
A product search can bring up a current page, an older brochure, a reseller description and an SDS together. Keep their jobs separate. Use current technical guidance for setup and application questions, and the SDS for handling information. Check the exact product and region before copying a number into the machine's instructions.
A distributor-hosted UNIMET AS 260 brochure contains a broader material and concentration chart than the current U.S. web page. The copy reviewed did not establish a current revision date. Treat it as background until the applicable local technical data and supplier recommendation are confirmed; do not copy its chart into a shop instruction by default.
| Information needed | Best evidence to request | Decision it supports |
|---|---|---|
| Exact supplied product identity | Container label, order identification and matching current documents | Ensures the recommendation addresses the fluid being purchased |
| Material and operation fit | Current technical information plus application-specific supplier guidance | Defines the jobs included in the trial |
| Mixing target and measurement | Written concentration range, measuring method and applicable conversion factor | Creates a repeatable operating instruction |
| Handling and exposure controls | Current SDS and the plant’s task assessment | Informs safe handling and required controls |
| Actual production performance | Recorded results from a controlled shop trial | Supports acceptance, adjustment or rejection |
Use the Tech Tool Oemeta SDS hub to locate safety information or request the appropriate sheet. An SDS supports handling decisions; it is not a substitute for a machining recommendation or proof of a particular tool-life improvement.
Concentration and refractometer factor: establish both before charging
The current manufacturer page does not publish one universal UNIMET AS 260 mix ratio or refractometer factor. Request the values applicable to the supplied product and proposed operation. A number copied from another UNIMET product, an old chart or the previous coolant can create a convincing-looking log with the wrong operating target.
Keep the setup information together at the machine: exact product, target concentration, working range, instrument method, factor or calibration, and who can make corrections. Record the raw reading beside the calculated concentration. If a result changes later, that record lets the next person check both what was measured and how it was interpreted.
Write a separate top-off instruction. A fresh fill and a sump that has been running don't necessarily need the same mixture. Ask the supplier how to respond to the measured concentration and the fluid losses in your process. Keep checking the tank as well as the mixer output, so a familiar dial setting doesn't hide a changing sump.
OSHA’s advisory metalworking-fluid best-practices manual describes concentration control, recorded additions and a written testing procedure as parts of fluid management. Its guidance also links excessively weak or strong mixtures with different operating problems. It does not supply an AS 260-specific target.
Use the actual water and delivery system in the evaluation
A qualification request should identify the water source and any treatment between that source and the mixing station. Include available hardness and water-analysis results, the point sampled, and whether makeup water differs from initial-fill water. “City water” describes the supplier, not the complete chemistry at the mixer.
Describe the machine with equal care. Record whether coolant reaches the cut through external nozzles, through-tool delivery or both. Include operating pressure and flow information if available, reservoir working volume, return arrangement, filtration and known tramp-oil leakage. Unknown values should be marked unknown rather than estimated to make the form look complete.
The manufacturer mentions foam behavior at a stated water hardness. That is not a blanket approval for every softer-water supply or high-pressure circuit. Ask for guidance on the combination you intend to run. During the trial, observe the machine’s most demanding normal delivery condition, including starts, stops and the return flow.
For a shop sharing one system across multiple machines, list every connected operation. A successful result on one machine cannot by itself qualify the whole system. If a shared reservoir prevents isolating a trial, resolve that limitation with the supplier before introducing a different fluid.
Build a qualification trial around decisions, not impressions
Choose a normal production job and, where practical, a difficult job the fluid will also need to handle. Put someone from production in charge of the run and name the person keeping the fluid records. Before changing over, agree on the trial length, sampling method, quality checks and conditions that would stop the trial. Everyone can then judge the same result.
- Record the baseline. Capture the current product, material, tooling, machine settings, acceptable-part count, tool changes, fluid additions and relevant quality results over a meaningful comparable run.
- Document the changeover. Follow the approved cleaning and transition procedure. Record residual-fluid or system-condition limitations that could affect interpretation.
- Verify the starting condition. Confirm the correct product, approved mixture, working level and initial measurements before treating the run as trial evidence.
- Hold the comparison steady. Keep the job and controllable cutting variables comparable. Log unavoidable changes in stock, tooling, operator practice or schedule.
- Review the whole result. Compare quality and operating burden, including downstream handling. Decide whether to accept, adjust within approved limits, extend the trial or stop.
Keep coolant, insert grade, speed and stock source steady enough to make the comparison useful. If several things change together, record them. Production may improve, but you won't know how much came from the coolant. Use that result to plan a clearer follow-up run rather than assigning the whole improvement to one product.
UNIMET AS 260 trial acceptance worksheet
Set plant-specific limits in the final column before running. Do not fill them in after seeing which fluid appears to win.
| Measure | Record consistently | Acceptance question |
|---|---|---|
| Part quality | Drawing checks, surface-finish results and reject reasons | Does the same job meet its required quality limits? |
| Tool consumption | Usable parts or cutting time per edge, with the same retirement rule | Is tool use acceptable without hiding an increase in defects? |
| Part condition after machining | Identified parts checked after the actual wash, dry and storage interval | Is condition acceptable at the next operation or shipment? |
| Machine and filter burden | Cleaning events, filter service and time spent intervening | Has routine labor or interruption increased? |
| Fluid consumption | Measured concentrate and makeup use, reconciled to production | What is the cost per acceptable part? |
| Control stability | Approved fluid checks, additions and unresolved deviations | Can the team keep the process within the agreed limits? |
For cast iron, record how the system collects and removes solids. For steel, include any long wait before washing or assembly. Both affect what you need to check during the trial. Evaluate solids handling and protection through that hold period alongside the fluid, so a good result at the machine doesn't hide a problem at the next step.
Keep the trial narrow enough to interpret and broad enough to cover the intended use. If production never reaches the most demanding job during the review period, mark that application unqualified. Extending a trial is more useful than treating an untested condition as a pass.
Bactericide-free does not mean maintenance-free
A formulation description is not a promise that a used sump cannot become contaminated. The U.K. HSE’s bacterial-contamination guidance explains the need to monitor fluid condition and use appropriate microbiological checks. It is useful technical context, not a U.S. compliance rule or a product-specific test schedule.
Agree with the supplier on the monitoring and response plan for your application. Do not add a treatment chemical simply because another machine uses it, or interpret a pleasant smell as proof that the system is healthy. Handle a concerning result through the plant’s established fluid-management and exposure-control process.
Keep splash control, housekeeping and the protective measures called for by the SDS, equipment instructions and task assessment in place during the trial. A worker-comfort claim doesn't replace those measures. Note any concerns and have the people responsible for workplace safety review them alongside the fluid and operating records.
Compare total trial cost per acceptable part
Illustrative calculation only: suppose two comparable runs each produce 10,000 acceptable parts. These figures are invented to demonstrate the worksheet; they are not AS 260 performance results or quoted product prices.
| Cost included over the run | Baseline example | Candidate example |
|---|---|---|
| Concentrate consumed | $900 | $1,050 |
| Documented coolant-service labor | $480 | $240 |
| Allocated disposal cost | $200 | $150 |
| Total included cost | $1,580 | $1,440 |
| Included cost per acceptable part | $0.158 | $0.144 |
In this example, higher concentrate expense accompanies a lower included operating cost. The difference is $140 over the run, or $0.014 per acceptable part. The conclusion reverses if the labor improvement does not occur. That is why the time record matters more than a projected savings percentage.
Keep tooling, rework and lost production outside this simplified subtotal unless you have defensible records and a consistent allocation method. Add them separately when measured. Avoid counting the same stopped hour once as labor and again as lost production without explaining the accounting. A short trial also cannot establish a year of sump life.
Questions buyers ask about UNIMET AS 260
What mix ratio should we use?
Use a current application-specific recommendation for the supplied product. Obtain the concentration limits and measurement instructions together before filling the machine; this guide does not establish a universal ratio.
Can we carry over the previous coolant’s refractometer factor?
No. Confirm the applicable AS 260 measurement information. A familiar instrument reading is not enough to transfer another fluid’s operating instruction.
Is AS 260 interchangeable with UNIMET 183?
Do not treat the names or shared application categories as an interchange approval. Ask Tech Tool to review the exact material, operation and operating requirements before substituting one product for another.
Can we extend the trial to aluminum or a special alloy?
Get current written guidance for that alloy and process. A broader chart found online should not automatically extend the scope of an approved steel or cast iron trial.
For product details and ordering, review Oemeta UNIMET 183 in Tech Tool’s catalog.
Request an application review and quote from Tech Tool
Send the material grade, operation, current coolant, water information, machine and delivery details, approximate working volume, and the problem you want to improve. Include any customer or machine-builder restrictions. That gives Tech Tool a useful basis for reviewing the Oemeta product choice, obtaining the applicable technical information and quoting the right supply quantity.
Ask Tech Tool about UNIMET AS 260 for your application. Bring the trial record and the questions it leaves open. We can help connect the product choice to a mixing and monitoring plan your team can use, and quote the supply quantity that fits the job. The result should be clear enough for production and purchasing to make the next decision together.
