Power Clean — industrial cleaning chemicals by Roovel Solutions
Chemist analysing residual particulate from a cleaned component in the laboratory

Millipore & Technical Cleanliness

SOLUTION · MILLIPORE CLEANLINESS

Automotive, bearing, injector and hydraulic customers increasingly ship against a weighed cleanliness limit rather than a visual standard. Most failures we are called in for are not cleaning failures at all — the part left the bath clean and was recontaminated afterwards.

The short answer

Millipore testing washes a component under controlled conditions, draws the extraction fluid through a weighed membrane filter, and reports the residue in milligrams. Passing consistently is a process achievement, not a chemical one: filtration, drag-out control, rinse quality and clean handling matter as much as the bath.

Reported as
mg per part or per m²
Often specified with
Particle-size class limits
Wash chemistry
Low-foam, 1–5%, 55–65 °C
Final rinse
DI, below 10 µS/cm
Usual failure cause
Recontamination after washing
HOW IT WORKS

Millipore cleanliness in practice

The component is washed under a defined fluid, volume, time and agitation to extract whatever contamination is on it. The extraction fluid is drawn through a membrane filter of known mass, the filter is dried and re-weighed, and the difference is the gravimetric residue. Most automotive specifications then examine the membrane optically and bin particles by size class.

Size matters separately from mass because a gram of fine dust and a single 500 µm hard steel particle can weigh the same and mean completely different things. The dust passes through a hydraulic circuit harmlessly; the particle scores a bore, blocks an orifice or destroys a raceway. Classification into metallic, non-metallic and fibre is diagnostically useful — swarf points at machining, fibres at wipes and packaging.

The wash process has to provide three things: a low-foam concentrate, because the geometry that holds contamination needs ultrasonic or agitated immersion and neither tolerates foam; continuous filtration so removed particles do not come back; and a counter-flow rinse with a deionised final stage below about 10 µS/cm so nothing is left behind as the part dries.

WHAT GOES WRONG

The Failure Modes

These are the problems we are called in for most often on this method — and what causes each one.

1

Recontamination downstream of the bath

Unfiltered rinse water, dirty baskets, shedding packaging, bare-hand handling and unfiltered drying air all put particles back on a part that left the wash clean. This is the most common cause of a failed result.

2

Extending cycle time instead of auditing handling

Longer washing does not fix recontamination. Test straight from the wash and again after packing — the gap between those two numbers tells you which problem you have.

3

Mains water on the final rinse

Indian industrial mains commonly runs 300–800 µS/cm, and every dissolved solid stays on the part when the water evaporates.

4

No bath filtration

Swarf and grinding fines accumulate until they redeposit. Filtration on the wash, and often on the rinse too, is part of the specification rather than an upgrade.

THE PROCEDURE

Running It Properly

  1. 1Baseline twiceTest parts straight from the wash, then again after normal handling and packing. The gap identifies whether the problem is cleaning or recontamination.
  2. 2Fix the larger gap firstIn most plants that is the handling chain — baskets, packaging, gloves and drying air — not the bath.
  3. 3Add filtration progressivelyWash first, then rinse, re-testing after each change rather than altering everything at once.
  4. 4Control drag-outHold baskets above the tank for 10–15 seconds with blind holes facing down, so dragged solution and its suspended particles stay in the wash.
  5. 5Finish on DIUse a counter-flow rinse with a deionised final stage below 10 µS/cm, then dry completely including internal features.
MATCHED GRADES

What We Recommend

Power Clean LF Low foam — required for the ultrasonic and agitated stages cleanliness work depends on.Power Clean NF-14 Neutral pH where the components are aluminium, brass or mixed.PC RP-636 Protects the cleaned part through storage and transit without adding particulate.

Read further

QUESTIONS

Millipore cleanliness — FAQ

The mass of residual particulate recovered from a component by a standardised extraction wash, captured on a membrane filter and weighed. It is reported in milligrams per part or per square metre and is the standard cleanliness specification for bearings, injectors and hydraulic components.
Usually because they were recontaminated afterwards. Unfiltered rinse water, dirty baskets, shedding packaging, bare-hand handling and unfiltered drying air all add particles downstream of the bath.
A low-foam aqueous concentrate at 1–5% and 55–65 °C, because the geometry that holds contamination needs ultrasonic or agitated immersion and neither works with a foaming cleaner. Chemistry alone will not pass the test without filtration, a DI rinse and controlled handling.
Deionised and typically below 10 µS/cm conductivity. Mains water in Indian industrial areas commonly runs 300–800 µS/cm, and everything dissolved in it is left on the part when the water evaporates.

Running millipore cleanliness?

Tell us the part and the equipment, and we will come back with a matched grade, dilution and trial plan.

Chemist holding a beaker of cleaning solution during batch quality control
NEXT STEP

Prove It on Your Own Line

Send a sample part with your soil and equipment details. The lab matches a formulation and returns a dosing and trial plan before anything ships in volume.

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