In a laboratory, most materials required for sampling are—in practice—nonhomogeneous mixtures. The best method of obtaining a small representative sample of the non-uniform whole is to take a quantity of the material large enough to be compositionally representative and reduce it to a fine homogeneous powder. For this purpose, a laboratory mill or grinder is usually used.
Top 5 Questions You Should Ask When Buying a Mill or Grinder
- Will the mill/grinder be used for wet or dry milling?
- For dry milling, ask how finely the material needs to be ground and what are the properties of the material? Rotor beater, disc, and mortar mills, for example, are best for mid-range grinding (final fineness of ~0.01-0.1 mm).
- For wet milling, ask what capacity of grinder you will need. Bead mills are usually best for small capacity applications while rotor-stator homogenizers should be considered for larger scale applications. For very large scale applications, industrial-scale mills are probably the best fit.
- How important is preventing cross contamination? Bead mills are likely a good choice if you don’t want any risk of contamination.
- Based on the materials you will be milling, how long does the mill or grinder typically last? How much do replacement parts cost and how easy are they to get? What level of support/warranties does the company offer?
Types of laboratory mills or grinders used by survey respondents:
Primary purpose of lab mill or grinder as reported by survey respondents:
|Clinical and diagnostic||3%|
Nearly 43% of respondents are engaged in purchasing a new laboratory mill or grinder. The reasons for these purchases are as follows:
|Replacement of an aging system||
|Addition to existing systems, increase capacity||
|First time purchase||
|Setting up a new lab||
Top 10 Features/Factors Respondents Look for When Purchasing a Laboratory Mill or Grinder:
|Durability of product||80%|
|Low maintenance - easy to use and clean||75%|
|Results with minimum deviation||71%|
|Value for price paid||71%|
|Service and support||59%|
|Reliability of vendor||56%|
|Reputation of vendor||45%|
|Variable Speed Controls||35%|
For more information on mills and grinders, including useful articles and a list of manufacturers, visit www.labmanager.com/mills-and-grinders
See survey results from previous years: