A-A-51247
6 December 1985
COMMERCIAL ITEM DESCRIPTION
BURET, LABORATORY (MICRO)
The General Services Administration has authorized the use of this commercial item description in preference to Federal Specification NNN-B-789.
This commercial item description covers one type of micro buret for precision laboratory procedures.
Salient characteristics:
Buret shall be in conformance with Type 1,Class A of ASTM E-438 and shall be suitable for precision laboratory procedures. Burets shall have uniform construction about axis of its centerline. Shall be a volumetric, microtype buret fitted with a leakproof three-way glass of TFE fluorocarbon stopcock with a retaining device. Glass plugs shall conform to ASTM E-911, and TFE fluorocarbon plugs shall conform to ASTM e-675. The stopcock shall have two bores, so that the graduated tube may be connected to either the filling tube or the delivery stem by rotating the plug 180o. The delivery stem shall be 85 to 95 mm in length. Shall have a nominal capacity of 5ml and graduated in 0.01 ml intervals. Main graduations shall be marked in Arabic numerals directly above the referenced graduation line. Shall be calibrated to deliver with an accuracy of 0.01 ml at 200C at nay indicated graduation marking and so marked on the buret. Each buret shall have the manufacturer’s name or registered trademark. All markings shall be permanent and legible.
Buret shall have one of the following which are considered defects:
Cracks or chips
Improper marking (or omitted)
Discoloration or distortion
Cloudiness
Missing components
Dirt or grease not easily washed off in normal lab procedures
Foreign material not easily removed
Workmanship. The micro buret shall be free from defects which detract from their appearance or impair their serviceability.
Unit. Each (EA). One buret, as specified, constitutes one unit.
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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