Cleaning Machined PTFE Parts

31 October 2014

Q. I just received your chapter on cleaning SOPs and I look forward to reading it. In parallel, I was hoping to get your thoughts or a bit of advice on how to create and implement cleanliness specifications/processes for machined (PTFE) plastic parts. Cutting fluid for the machining center is basically a water soluble vegetable oil-based fluid. The use of this plastic manifold and cover is within an electro-mechanical-fluidic subsystem (“Delivery Module”). This delivery module accumulates a quantity of 59wt% Hydrogen Peroxide that has been extracted from our existing consumable, and then meters smaller quantities of hydrogen peroxide into our system for use. The hydrogen peroxide is accumulated within aPTFE manifold and held onboard for a period of days. The manifold has a cover that seals (with o-rings) the internal volumes. Hydrogen peroxide, as you may know, is very unstable when in the presence of any small amounts of organics or decomposing metals. We must ensure that these parts are very well cleaned, packaged, and assembled to prevent decomposition. The machined NXT 75 PTFE vendor’s current process related to cleaning is to wipe the parts down with a dish-soap (Ivory) solution, rinse, then run through a series of baths: 1) 10 mins in an ultrasonic bath with 1% Alcanox solution at 50 degrees, 2) Ultrasonic DI Water Rinse Bath, 3) Dead Water DI Water Rinse Bath.

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Posted in Alconox, Citranox, Pharmaceutical0 Comments

Solution Preparation Tank

Cleaning Tanks with Titanium Dioxide

31 October 2014

Q: We are having trouble removing TiO2 from our stainless tank using our CIP system, no matter how much cleaner or temperature elevation we use.  Can you please advise? A:  Residual TiO2 can certainly pose issues due to it’s nature in the presence of heat.  To remove TiO2 from tanks using CIP sprayballs, it is […]

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Posted in Biotechnology, Pharmaceutical, Solujet0 Comments

Cleaning Liquid Residue on Pipet Walls

30 October 2014

Q. We are doing some experiments to quantify the amount of liquid residue on pipet walls before/ after cleaning. In practise, this would relate the accuracy of the pipet to its cleanliness. Could you inform us if the use of Alconox affects the amount of beading (of distilled water) on the walls of a brush cleaned and rinsed pipette, compared with the use of common dishwashing liquid? A. Proper cleaning of a pipet will result in the designed amount of fluid being measured in a pipet according designed amount of beading resulting from the correct clean surface energy of the pipet and the surface tension of the fluid being measured. Typically pipets . . .

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Optical Lens Cleaning

29 October 2014

Q. How do you clean wax marks on optical lenses which are difficult to remove? A. Use either 1% Alconox or Liquinox in a heated 160 deg F ultrasonic bath followed by a deionized water rinse to clean optical lenses during manufacturing.

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Posted in Alconox, Liquinox, Optical0 Comments

Sewage Sampling Equipment Cleaner

28 October 2014

Q. We have a client who is about to begin using a peristaltic pump to obtain sewage samples from multiple sources. How should they clean the pump and tubing? A. To clean the pump and tubing use a warm 1% Liquinox solution (10 mL/L) followed by a thorough rinse. You can pump 1 system volume of Liquinox through the tubing using . . .

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Lab Glassware

Labware Cleaning: Solujet Leaving Ring

28 October 2014

Q. It appears that the Solujet is leaving a ring on some of the labware that cannot be removed. What is this ring (sodium silicate?)? How do we remove it? The labware has not been completely submerged. We have just added the Solujet soak for some labware that may have stubborn organics. We have been giving the labware a 4 hour soak in 1% Solujet, followed by warm tap water rinse then wash with Liquinox followed by 3x DI rinse. Click for the Answer.

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Posted in Laboratory, Liquinox, Solujet0 Comments

Sonicating hardened steel

27 October 2014

Q. We need to find an alternative cleaning solution we can use to sonicate metal (hardened steel) tools with that won't rust them. A. Hardened tool steel is prone to flash rusting on exposure to water and humidity with dissolved oxygen if there are no corrosion inhibitors present. You can clean tool steel in a warm Alconox solution (less than 120 deg F or less than 45 deg C) followed by an ambient temperature rinse (circa 70 deg C or 20 deg F) and a rapid ...

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Posted in Alconox, Industry0 Comments

Thin tube cleaning

24 October 2014

Q. How can I use Citranox to clean thin tubes or needles? A. To clean thin tubes, the best thing is to get cleaning solution flowing through the tubes. If you want to simultaneously clean the inside and outside of the tube, you need to flow solution through the tube under immersion. Learn More.

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Industrial Laser Chiller Cleaning

23 October 2014

Q. Chillers get scale build-up that reduce their heat transfer efficiency, thereby reducing their chiller performance. In particular industrial lasers need good chiller performance. Therefore, use a 2% Citranox or Citrajet solution to remove calcium scale build-up. Be sure a 100 micron filter of adequate flow rating is installed in the coolant path. Be sure no galvanized pipe is in the system. Learn More.

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Posted in Citrajet, Citranox, Industry0 Comments

pH of a 1% Alconox Solution

22 October 2014

Q. What is the pH of a 1% solution of Alconox for cleaning? A. A 1% solution of Alconox has a pH of 9.5. This is a mild alkaline solution suitable for general purpose cleaning of a wide range of organic and inorganic residues. The pH of a 1% Alconox solution and other technical information can be found on an Alconox technical bulletin and Material Data Safety Sheet (alconox msds).

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