Enzymes do something no detergent can — they digest the soil rather than lifting it. Run outside their effective temperature range and cleaning performance falls away — too cold slows the reaction; excessive heat can denature the enzymes.
Blood, tissue, fat and starch behave differently from workshop oil. They bond to stainless, they dry hard, and they hide in hinges, box locks and lumens. Enzymatic chemistry is the answer, and it is the one product class where getting the temperature wrong destroys the product outright.
A detergent lifts and suspends soil. An enzyme breaks the soil down chemically into smaller, water-soluble fragments that rinse away. Three families do the work in instrument reprocessing:
Multi-enzyme products contain more than one, because real bioburden is a mixture. A protease-only product on fatty tissue underperforms and the operator concludes "enzymes do not work", when the truth is the wrong enzyme was present.
This is the exact opposite of the instinct most operators bring from workshop cleaning, where hotter is generally better. Set an enzymatic ultrasonic bath to 70 °C and you have a warm tank of surfactant with no enzymatic action at all. It will still clean something — just not the protein you bought it for.
There is a second reason to keep it cool. Heat coagulates protein onto the instrument, exactly as it sets an egg white. A hot pre-soak does not just kill the enzyme; it bakes the blood on. See temperature and substrate tolerance for the general principle.
Enzymatic products are formulated near-neutral, typically pH 6–8. That is what makes them safe on the mixed metals, anodised handles and delicate tips in an instrument set, where an alkaline degreaser would attack finishes.
Enzymes need contact time — they are a chemical reaction, not a solvent. Follow the manufacturer's dwell, and do not shorten it because the cycle timer is inconvenient. Where ultrasonics earn their place is in getting the enzymatic solution into the places soil hides: hinges, box locks, serrations, cannulae and lumens that no brush reaches.
The combination is the point. Enzyme digests the soil; cavitation delivers the solution into the geometry and carries the debris out.
For instrument sets, the practical machines are the PowerSonic benchtop range for a single practice or surgery, and the MSX 15 and MSX 30 where volume, duty cycle and a controlled, repeatable cycle matter — the MSX 30 in particular is built for continuous reprocessing duty with a lid, load sensing and stored recipes.
The cleaning cycle, chemistry, temperature and dwell are matched to the instrument set, soil and load. Where process validation is required, representative instruments can be used to confirm the operating parameters and cleaning result.
We assess each application. Where required, we validate the process through a controlled cleaning trial on the machine and chemistry we would specify, with the cycle and the result reported against your standard — ask us to scope it.