Regular monitoring and control of bacterial contamination in fluids, machinery, and pipework are essential to ensure both operational efficiency and compliance with Health and Safety Executive (HSE) guidelines. Coolant is the lifeblood of your machining process. It keeps tools cool and ensures a high quality finish on every part you produce. However, coolant is also an ideal breeding ground for bacteria.
One of the most effective ways to manage this risk is through the consistent use of dipslides and a dedicated dipslides incubator.
Why consistent testing matters
Bacteria in your coolant are more than just a nuisance. If left to multiply, they can cause serious issues for your workshop.
One of the first signs of a problem is a strong and unpleasant odour often described as a rotten egg smell. This is a clear indicator that the fluid is beginning to degrade. As bacteria grow, they produce acidic waste that lowers the pH level of the coolant.
When the pH drops, the fluid becomes more corrosive. This leads to rust on your workpieces and can cause long term damage to your machine components. Beyond the equipment, there is a significant health risk to your staff. Exposure to contaminated fluids can lead to various health issues including respiratory infections, allergic reactions, asthma, skin irritation and contact dermatitis.
Additionally, symptoms like eye, nose, and throat irritation are common. Regular testing ensures you catch these problems before they impact the health of your team or the quality of your output.
The critical role of the incubator
While taking a sample with a dipslide is easy, the way you store that slide afterwards is what determines the accuracy of your results. Many people make the mistake of leaving dipslides on a desk or in a cupboard at room temperature. This is not an effective way to test.
Industrial bacteria grow best at a stable temperature of 30 degrees Celsius. In a typical workshop, temperatures fluctuate constantly. If the environment is too cold, the bacteria will not grow as they should, and you will get a false low reading. This gives you a false sense of security while the bacteria continue to multiply in your machines.
A dipslides incubator solves this problem by providing a stable and controlled environment. It maintains the exact temperature required for the microbes to flourish on the slide. This consistency means your weekly tests are repeatable and accurate. It gives you the confidence to know exactly when to adjust your fluid parameters or add biocide.
Key measures for fluid quality management
Following a simple routine will help you stay compliant with HSE guidelines. Adhere to guidance by conducting weekly tests on metalworking fluids to identify and address contamination promptly.
Safety first
Always wear gloves when handling metalworking fluids to protect your skin from exposure.
Take the sample
Remove the MCBTM2 dipslide from its tube. Place it into the fluid for 10 seconds, ensuring it is fully covered.
Drain and store
Allow excess fluid to drain off before placing the slide back into its sterile tube.
Incubate
Place the tube into a compatible incubator.
For the bacteria side of the slide, check the results after 24 to 48 hours. The yeasts and moulds side takes longer and should be left for up to 120 hours. Once the time is up, compare the colonies on the slide to the reference chart provided.
Understanding your results
The results are measured in colony forming units per millilitre. When you check your slides after incubation, you will likely notice dots on the agars. The total bacteria side will show red dots, while the yeasts and moulds side will show clear or fluffy bumps.
If the slide shows very little growth, your fluid is being well maintained. If the growth is moderate, you should review your fluid concentration, pH, and tramp oil levels. If the count is high, immediate action should be taken in line with the risk assessment. Normally draining and cleaning should take place. The HSE advise that all good practice measures and monitoring of the metalworking fluid are performed before adding biocide.
Microbial growth is often linked to other factors. For example, tramp oil sitting on top of the coolant creates an airtight seal that helps certain bacteria grow faster. Low fluid concentration or an accumulation of metal fines can also provide the perfect conditions for contamination. By using an incubator regularly, you can see how these different factors interact and keep your system in perfect balance.
Industry leading protection for your workshop
Investing in a dipslides incubator is a proactive step toward a more professional workshop environment. It removes the guesswork from your maintenance routine and provides a clear record of your fluid health. This is vital for staying compliant with safety regulations and protecting your expensive machinery from corrosion.
Contact SAWS UK today to discuss your requirements or request a quote for our range of dipslides and incubators.
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