When tested with an XRF instrument (all accessible components tested) this Brandywine Stainless Steel Finish knob set from Home Depot (pictured here) had the following readings (with each reading done for at least 60 seconds):
Main part of Knob / Handle that you touch:
Stainless Steel # 304
Metals not detected by the XRF are not listed.
- Chromium (Cr): 162,200 +/- 1,000 ppm
- Bromine (Br): 26 +/- 12 ppm
- Tin (Sn): 148 +/- 42 ppm
- Copper (Cu): 6,074 +/- 436
- Nickel (Ni): 94,400 +/- 1,300 ppm
- Iron (Fe): 714,500 +/- 1,900 ppm
- Vanadium (V): 683 +/- 185 ppm
- Molybdenum (Mo): 2,340 +/- 113 ppm
- Cobalt (Co): 3,397 +/- 1,070 ppm
- Magnesium (Mn): 15,700 +/- 1,000 ppm
Rounded part of shaft of latch:
[Metal -Zn]
- Chromium (Cr): 2,960 +/- 417 ppm
- Zinc (Zn): 351,300 +/- 3,500 ppm
- Iron (Fe): 639,600 +/- 2,500 ppm
- Cobalt (Co): 3,736 +/- 1,189 ppm
- Magnesium (Mn): 976 +/- 445 ppm
Rectangular part of shaft of latch:
- Zinc (Zn): 429,400 +/- 5,000 ppm
- Iron (Fe): 561,400 +/- 2,500 ppm
- Cobalt (Co): 3,472 +/- 1,111 ppm
- Magnesium (Mn): 905 +/- 439 ppm
“Tongue” of latch (moving part):
- Chromium (Cr): 700 +/- 196 ppm
- Zinc (Zn): 996,700 +/- 12,000 ppm
Chromed “Collar” (that goes around tongue of latch):
- Chromium (Cr): 3,870 +/- 132 ppm
- Zinc (Zn): 295,600 +/- 2,100 ppm
- Iron (Fe): 697,100 +/- 1,800 ppm
- Vanadium (V): 140 +/- 66 ppm
- Titanium (Ti): 229 +/- 93 ppm
- Cobalt (Co): 2,042 +/- 869 ppm
- Magnesium (Mn): 653 +/- 315 ppm
As always, thank you for reading and for sharing my posts.
Please let me know if you have any questions.
Tamara Rubin
#LeadSafeMama
Hello! I’m so glad I stumbled upon your website. I’m planning on updating all the door knobs in our house. I see based on your tests that stainless steel is a good option. Have you tested any stainless steel that has a finish? Trying to see if there is a correlation between black finishes and lead. Thank you!