Chemically Inert Coating Properties

Improve Analytical and Process Sampling 

Improve Test Reliability and Quality

SilcoTek® offers CVD coating solutions to make your analytical and sampling systems perform better.  Our chemically inert coatings improve test accuracy and reliability by preventing chemical reactions between the sample and flow path surface. Get the right coating solution for your process and products.

SilcoTek's CVD silicon coating process bonds inert, non-reactive coatings like Dursan® and SilcoNert® to the surface.  The chemically inert coatings prevent interaction of the sample with the reactive flow path surface. 


Comparative Testing 

SilcoNert 2000 offers part-per-billion sensitivity without costly system redesign or new process development, saving labs time while improving quality.  Field testing or harsh environments like stack testing demand both inertness and durability.  Dursan offers parts-per-million inertness while withstanding corrosive attack.  Making it ideal for process analytical applications.  Comparative testing demonstrates the effectiveness of SilcoNert.  Reactive flow paths (left GC chromatograph) cause peak distortion, lost peaks, and can lead to retesting or test failures.  SilcoNert coated flow paths (right graph) assure complete peak resolution without distortion.    

SilcoTek® coatings improve performance & prevent common sampling and test problems.

  • Lost peaks
  • Peak tailing
  • Calibration errors
  • Ghost peaks

Reactive Flow Path: Lost Peaks and Poor Peak Shape

GC Peaks Reactive flow.Lost peaks

SilcoNert Flow Path: Prevent Peak Loss and Distortion

GC SilcoNert Good Peaks (002)


Properties and Solutions Resources



Without inert coatings like SilcoNert® and Dursan®, analyzer and downhole sampling systems produce inconsistent or substandard results, such as:

  • Erratic sulfur calibration

  • Long delays in sulfur response in CEMS

  • Erroneous test results

  • False positive or negative sulfur readings

  • Low or no sulfur in sample cylinders

H2s cylinder loss 2



Properties and Solutions Resources


 Without an inert coating like SilcoNert®, analyzers will produce inconsistent or substandard results, such as:

  • Erratic calibration
  • Long delays in response 
  • Erroneous results
  • False positive or negative readings
  • Calibration problems
  • Flow path adsorption or lost sample


Properties and Solutions Resources

Select The Right Surface For Ammonia Sampling

7 Tips For Improved Analytical Sampling

Prevent Mercury Loss In Coal Plant Stack Sampling

Improving The Performance Of FTIR Systems


SilcoTek sample cylinder coating and sample flow path coatings improve yield, and efficiency in a wide variety of applications:

  • Specialty gas 
  • Downhole sampling
  • Hydrocarbon processing
  • Natural gas sampling and transport
  • Semiconductor manufacturing gas delivery

SilcoNert® 2000 and Dursan® coated sample cylinders, sample cylinder valves, and dip tubes allow precise fluid sampling and delivery with unsurpassed reliability, durability, and precision.  Our coatings are non adsorptive to active and reactive compounds like:

  • H2S
  • Mercaptans
  • COS
  • SOx
  • Ammonia
  • Mercury
  • NOx
  • VOC's
Inertness Response



Properties and Solutions Resources


Stainless steel columns and flow paths can interact with the analyte, causing adsorption and poor chromatography.  CVD coatings, like Dursan, create an iron-free bio-inert flow path that minimizes unwanted interaction with proteins, peptides, chelating molecules, and other troublesome analytes.  Benefits of an inert metal-free HPLC column coating include:

  • Metal-free HPLC flow path for improved durability and corrosion resistance, even under extreme pH conditions.
  • Improved peak shape and peak resolution.
  • Improved bio-inertness of frits and other difficult components that cannot be treated by other methods.
  • Enhanced chemical compatibility, even with media like tetrahydrofuran (THF) that challenge PEEK.

Chelating agent analysis demonstrates the benefit of the Dursan coating.  The resolution quality of tetracycline on a stainless steel column (A) showed poor peak shape and response.  The Dursan® coated column (B) significantly improved the peak shape and response.

 Tetracycline Broken HPLC Data


Properties and Solutions Resources


Have Questions About Evaluating, Buying, and Using Our Coatings?

We're here to give you tips to guide you through the evaluation and purchase process.  Watch our coating video to see how we improve the performance of your products.



HubSpot Video



Go to our Buying and Using Our Coatings page and we'll guide you through the purchasing process.  Or have a Customer Service Representative contact you, our Customer Service staff and Technical Support staff are here to help guide you through the coating process, including:




Product information and application guidelines



Quote request information



Whitepapers and test data



Shipping logistics and supply chain management support



Evaluation samples

Stocking VAR icon


Quality systems and auditing



Manufacturing specifications



Product support



Pricing guidelines



Coating use and care guidelines