Monthly Archives: March 2019
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March 05, 2019
For particle and gravimetric analyses such as sediment testing of coolants and machine oils, nylon membrane filters are often utilized due to superior strength, chemical compatibility, and lot-to-lot consistency. Filters with 10 and 20 µm pore size ratings offer fast flow combined with consistent retention and are recommended in GMW16037: Test Method to Quantify Cleanliness of Engine and Transmission Components.1 Unfortunately, these filters have recently become more difficult to source, as some manufacturers have discontinued 10 and 20 µm rated nylon membranes. To address the market need for 10 and 20 µm rated nylon membrane filters, Sterlitech is introducing our new Nylon Cleanliness Test Filters.
These filters are specifically designed for cleanliness testing in the automotive and aerospace industries. They have virtually the same water bubble point specifications, and consequently very similar retention, as the discontinued 10 µm and 20µm rated nylon membrane filters. They also
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March 05, 2019
Electrical Conductivity is the ability of a solution to pass an electrical current. All ions present in a solution contribute to the conductivity measurement. How well a solution conducts electricity depends on several factors such as concentration, mobility and valence of the ions present.
Electrical conductivity measurement using digital conductivity probes is generally a reliable, sensitive and low-cost method. Â Surveillance of feed, permeate and reject quality and estimation of the total number of ions in a solution in the membrane filtration systems can all be performed using online and real time conductivity measurement techniques.
Unit of Measurement for Electrical Conductivity
The unit of measurement for electrical conductivity is commonly used as one millionth of a Siemens per centimeter (micro-siemens per centimeter or µS/cm). When measuring more concentrated solutions, the units are expressed as milli-siemens/cm (mS/cm). For ease of expression, 1000 µS/cm are equal to 1 mS/cm.
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March 05, 2019
Are you interested in learning more about the membrane filters you use in the lab every day?
Tune in to Sterlitech’s upcoming webinar on April 9th at 8:00 am PT. This webinar will provide an introductory overview of microfiltration membranes.
Join our filtration experts as they discuss characteristics and applications for membrane filters and answer any questions you may have.
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You'll walk away knowing:
- What microfiltration membranes are and how they work
- How to decide which membrane filter is right for your application
- Where to find additional resources
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Please register here to attend.
