No experience with the Spex mixer mills, but we have a Retsch MM301 that
has been quite good. We bought 25 mL stainless steel jars with tungsten
carbide liners and balls (all their other options were on our analyte
list). It's a 2 position mill with variable frequency (up to 30 Hz). We use
it to grind ores primarily and it works quite well for a limited sample
size (5-7g per jar). If we need to grind larger quantities, we use a ring
mill. We also use it just for blending our sample and binder for preparing
Not cheap, but it's been absolutely reliable.
Laurie Ottmar, Ph.D.
Manager-Global Analytical Research
Millennium Inorganic Chemicals, A Cristal Company
6752 Baymeadow Drive
Glen Burnie, MD 21060
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Chem.(ICP's, Ball Mills for sample prep
Please respond to
Does anyone have experience with Spex 5100 or 8000M Mixer Mills, or
similar competitors' products?
The Spex equipment is certainly more affordable than others I have seen,
but that worries me.
The Spex mill seems to have sample vials and grinding balls made from a
wide variety of materials:
Agate, polystyrene, polycarbonate, polyethylene, stainless steel,
"hardened steel," tungsten carbide, zirconia, alumina ceramic vials
Methacrylate, zirconia, tungsten carbide, stainless steel grinding
Some seem attractive from a metals contamination standpoint, but I
wonder about effectiveness, as well as if the machine does a good job
without falling apart in two months or contaminating samples like crazy.
R. Steven Pappas, Ph.D.
Emergency Response & Air Toxicants Branch
Centers for Disease Control & Prevention
4770 Buford Hwy. NE, M.S. F-44
Atlanta, GA 30341-3717
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