All Teflon® Microwave Digestion Vessel. Made of Virgin, isostatically pressed PTFE, the thick walled construction provides deformation resistance
even at medium high pressures and temperatures. The body is available in 5 capacities from
5 to 100ml to which is added the threaded clamping seal cap fitted with a pressure control
fitting/venting tube. A thin fluoroplastic foil is inserted between the body and the cap
which acts as a seal and rupture foil to allow venting of aggressive gases to a hood or
bath via a tube. A pressure control device or gas line can be connected to the fitting.
For preparation of small samples in an acid resistant, contamination-free vessel.
Experiments can be conducted in a microwave oven.
|
The Advantages of Using Teflon®:
|
Inert to all chemical reagents except molten alkali metals: Teflon® is
completely inert to all concentrations of such corrosive reagents as boiling aqua regia,
hydrofluoric, nitric, and sulfuric acids....alkalis....boiling hydrocarbons, ketones,
esters, and alcohol's.
|
Strong/Tough, Resilient Construction. Teflon® is unbreakable, even at
cryogenic temperatures and cannot be cracked or chipped by thermal or mechanical shock.
|
Thermal Stability. Teflon® can withstand continuous heat as high as 250°C and
temperatures as low as -268°C.
|
Contaminant Free. Berghof/America PTFE is made of
pure white virgin Teflon®. It does not contaminate materials in process, imparts no odor,
and does not support the growth of bacteria.
|
Non-wetting, Low Absorption. Liquids can be easily poured, absorption levels
for solvents rarely exceed 1% and do not in any way affect the chemical makeup of PTFE.
|
| Microwaves penetrate the PTFE and interact with the contents of the vessel (the filled
vessel can also be placed into a conventional drying oven). |
| To minimize adverse effects from a foil
rupture, a tube (10mm OD) can be attached to the clamping cap fitting and vented to the
atmosphere, a hood, or a vat. |
Due to the hydrophobic properties of PTFE, the vessel can be drained almost completely and rinsed with a
small amount of cleaning solution.
|
According to Howard M. Kingston of the National Bureau of Standards
(NBS), microwave digestion "is a new, more rapid tool for the analytical chemist
involved in sample preparation, and it is capable of doing some preparations more reliably
and accurately than can be done by conventional methods."
|
