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  1. usjbh

    Hastelloy C-276 Chemical Reactions

    I have sintered H C-276 filter disks undergoing chemical compatibility soak tests in some 30 different solvents and chemicals. The 6M Nitric acid test solution turned a light green coloration after one hour exposure then turned light blue after 3 hours. One week later the blue color is getting a...
  2. usjbh

    Is Window Pane Glass really Glass?

    You brought up a good point about the variation of the glass thickness when originally made. If I were putting glass like this into a new window I would put the thick end down as this would provide more strength when shutting the window and would also provide a better slope for shedding rain water.
  3. usjbh

    Is Window Pane Glass really Glass?

    A few other sugestions are to look on e-Bay using a google search for antique wavy glass window panes. They are a hot commodity. A more enjoyable and fun way to search for your glass panes is to go to the spring antiques shows held in May at Brimfield Mass. http://www.brimfieldshow.com/ or look...
  4. usjbh

    Fracture in HDPE Living Hinge

    If the molder is trustworthy and is using the same HDPE from the same supplier, I would begin my investigation with the material supplier. The ideal situation would be to take some of your previously acceptable parts and your current parts that are failing and have them analysed using Waters...
  5. usjbh

    Pitting of electroless nickel over 2024-T351

    I am late to this thread but could not help but want to add my 2 cents. 2024 is a popular alloy for machining but is probably the worse alloy to use in an environment where there is corrosion potential. The 4% or 2 cents worth of copper added to improve 2024 machinability is its downfall. I...
  6. usjbh

    Screw compressor for CO2

    It's been over 25 years since I've done any system engineering using screw compressors for clean air, but I always used Balston coalescing filters to remove the oil. They are now part of Parker and you can contact them for your post filtration requirements...
  7. usjbh

    Outgassing of anodized aluminum

    Organic dyes are typically used for most color anodizing and usually processed per MIL-A-8625D Type II (sulfuric). There are at least six or more different black dyes that can be specified for black color anodizing. Contact Orco for more information about your actual application to determine if...
  8. usjbh

    Chemical Attack of Nickel Plating

    We are considering making a protective cover for a transducer electronics out of Polyphenyl Sulfide (PPS) that would require EMI shielding and a decorative finish. Nickel plating, specifically electroless, was proposed to do this. Additionally this cover is in an area where leaks or drips of...
  9. usjbh

    ASTM TP 316/316L

    Thanks for the reply CoryPad but I don't think that Type is the answer. I realize now that I should have posted this question in the ASTM forum but I wasn't a subscriber to it. I dug out a few of the ASTM standards this morning and started looking a little deeper. ASTM A213 designated grades...
  10. usjbh

    SS304 / SS316 - how to check on them ?

    It is interesting how a request for a simple test to determine the difference between 304 & 316 evolved into an ethics discussion. Ethics aside, I came across an old Carpenter Material Data Guide from the early 70's that listed methods for identifying stainless steel in the back of the catalog...
  11. usjbh

    ASTM TP 316/316L

    What does the Tp in ASTM TP 316/316L stand for?
  12. usjbh

    SS304 / SS316 - how to check on them ?

    In response to NickE's reply I had to come back to defend my EDS recommendation vs. XRF. We use SEM EDS all the time because our samples are usually unknown particles trapped in 2 micron filters that we are trying to I.D. XRF, which is typically used in foundry environments, requires a large...
  13. usjbh

    SS304 / SS316 - how to check on them ?

    I've used the Koslow test kit 25 years ago to distinguish between 304 & 316 and identify the Mo. I found it to be not as difinitive as I would like, particularly when objective evidence is needed should the supplier be using 304 ss. I prefer sending a very small sample of the material to an...
  14. usjbh

    New Technology Materials for Stables

    Victor, There is something to be said for traditional materials like wood. In my early career as an engineer I worked with a scientist at the Foxboro Co. who designed and built all his engineering models from wood. By his example he had convinced me that wood was one of the most neglected...
  15. usjbh

    Titanium & 50 - 500 mM NaOH compatibilty

    My thanks to for the response and vote of confidence for my application. I've delayed responding pending further investigation into two other aspects of performance, passivation and hydrogen embrittlement. GR 4 & Gr 5 (6AL - 4V) Titanium were identified as more susceptible to SCC (Stress Crack...
  16. usjbh

    What are the most U.V. stable carbo

    What are the most U.V. stable carbon fillers available for polymers? What company has the best technical information available pertaining to this subject?
  17. usjbh

    Titanium & 50 - 500 mM NaOH compatibilty

    How well does Titanium Gr 2 drawn capillary tubing, Gr 4 & 6Al4V alloy machined pump components perform with 50 - 500 mM Sodium Hydroxide to 40 degrees Celcius at pressures up to 5,000 psig? We have done some static compatability testing with 100 mM Potassium Hydoxide and extended life testing...
  18. usjbh

    What is the most promising concentration of ce graduate studies?

    I saw this question posted without any responses and that tweeked my curiosity. I know that I cannot answer your questions as asked but I can offer an observation and perhaps a little advice based on my own 40 years of wandering through life trying to find a professional role. I am two years...
  19. usjbh

    explosive boss

    The original question was how to put an end to his bosses outbursts when everyone knows there is a problem? I normally would ask this question before offering any suggestions. Has your boss's behavior affected your own productivity? If the answers is yes, then I would ask another question, have...
  20. usjbh

    Galling of stainless screws and pem nuts

    If this is a custom screw you can specify Carpenter Gall Tough or Gall Tough Plus stainless. If it is a standard off the shelf screw or a custom part that cannot accommodate the specialty stainless alloy lead time requirements you can specify Kolsterising http://mcna.bodycote.com/ as a post...

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