Spex 6700 Freezer Mill

Used Lab Equipment Warranty Condition: Used Will be thoroughly tested and serviced
Stock #:
1 Available In Stock (request a quote)
Dimensions (approx.):
13"W x 14"D x 11"H (outside)
115 Volts, 60 Hz, 3A
Product Description The SPEX 6700 Sample Prep Freezer/Mill is a cryogenic laboratory mill which chills samples in liquid nitrogen and pulverizes them with a magnetically driven impactor. Each sample is placed in a separate grinding vial which is immersed in a liquid nitrogen bath inside the mill. Thus, there is no cross-sample contamination and the low temperature of the sample is maintained during grinding. These features have made the SPEX Freezer/Mill the most effective in the world, the "mill of last resort" for many normally ungrindable samples.
The capacity is as much as 4 mL (3-5 g of many samples) for the 6751 vial, and around 0.5 mL for the 6753 microvial (vials are not included). Chilling materials in liquid nitrogen (at temperatures approaching -200C) has two important consequences for sample preparation: it embrittles flexible samples so they can be pulverized by impact milling and it preserves structural and compositional aspects usually damaged or lost during room temperature pulverizing. Some uses are DNA Extraction (Human bones and teeth, especially when fresh, are difficult to pulverize with normal mills. However, skeletal material can be ground cryogenically and DNA extracted from the powder, whether the remains are recent or very old); Trace Element Analysis (Low levels of toxic heavy metals such as cadmium, chromium, and mercury are known to have profound effects on human health. Many such samples, from fish scales and bovine liver to the plastics used in food packaging and children's toys, have to be prepared for analysis); Screening of Asbestos-Containing Materials (useful not only to break up the matrix and free included fibers for polarized-light microscopy, but also to grind those fibers finer for X-ray diffraction analysis); Pharmaceutical Analysis and Drug Testing (Preparation of key samples, whether the compounds themselves or tissues which may contain them, is greatly facilitated by cryogenic grinding in SPEX SamplePrep Freezer/Mills); Recovery of Volatile Compounds (Coal, petroleum shale, waxes, and many other organic materials contain light-molecular-weight fractions which are quickly driven off when their matrix is pulverized at room temperature. Grinding these materials in Freezer/Mills insures the retention of volatile components, which can be concentrated later by heating the ground sample in a gas trap); Mineralogical Studies (When chilled during grinding in SPEX SamplePrep Freezer/Mills, clays and fibrous amphiboles as well as other minerals can often be broken up more completely, exhibiting more nearly random orientation of grains and maintaining greater structural integrity); Medical Research (pulverizing of fresh, sterilized bone to use as a cement in joint-replacement surgery; of heart tissue to smear on slides as a culture medium; to grind implant materials to a fine powder which can be injected into live subjects for allergy and toxicity testing; pulverize fresh teeth without degrading them through heating plus many more).


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