Laboratory glassware — Density hydrometers for general purposes — Part 2: Test methods and use
The determination of the density is specified considering the general procedures. Apparatus and readings of the density and temperature are described and also the application of the corrections. In drawings the construction and the demensions of suitable vessels are shown.
Laboratory glassware — Graduated pipettes — Part 2: Pipettes for which no waiting time is specified
The special requirements deal with three international acceptable series of pipettes (type 1, 2, and 3) which are adjusted to class A or class B accuracy. Capacity, graduation, delivery times are specified.
Laboratory glassware — Graduated pipettes — Part 3: Pipettes for which a waiting time of 15 s is spe...
The special requirements deal with a international acceptable series of pipettes with comparatively large jets with waiting time of 15 s for compensaiting the possible effect of shorter delivery times. They are adjusted to class A accuracy.
Laboratory glassware — Graduated pipettes — Part 4: Blow-out pipettes
The special requirements concern the capacity, graduation, figuring, delivery and identification. The lower end of the scale and the delivery time are tabled for the nominal capacity. The handling of the pipettes at the measurement is specified.
Laboratory glassware — Density hydrometers for general purposes — Part 1: Specification
The requirements for basic series and sub-series of glass hydrometers of constant mass without built-in thermometer are specified. They are graduated to indicate density at 20 degrees centigrade and 15 degrees centigrade, respectively. Standard categories of surface tension are tabled in annex A, recommended stem diameters in annex B.
Laboratory glassware — Graduated pipettes — Part 1: General requirements
Pipettes with no waiting time and with waiting time of 15 s and such ones adjusted for blow-out are generally concerned and specified. Limits of error for class A pipettes are shown in relation to capacity in annex A and in relation to diameter at the miniscus in annex B.
Spices and condiments — Preparation of a ground sample for analysis
Basis for this method is the laboratory sample obtained by the method specified in ISO 948. The principle of determination consists in grinding the laboratory sample, which has been previously mixed, to obtain particles of the size specified in the International Standard appropriate to the spice or condiment concerned or, if not so specified, to obtain particles of size approximately 1 mm.
The requirements specify a series of capacities from 100 ml to 2000 ml. The construction with material, shape, radius of curvature of base and the vacuum connection are illustrated. The dimensions are tabled and the most important sections of the flask are drawn. The annex specify hydraulic external pressure tests.
Plastics laboratory ware — Graduated measuring cylinders
The requirements specify a series of plastic cylinders having a graduated volumetric scale and a pouring spout. The series of nominal capacities is tabled and so do the dimesions. The construction is illustrated by some figures showing the general appearance and the scales of measuring cylinders. The annex deal with testing of plastic cylinders, test for ionic material extracted by water and with…
The specified requirements deal with two series of inexpensive "commercial" liquid-in-glass thermometers, when great accuracy of measurement is not requirend: a series designated A to H, in which nominal ranges and maximum overall lengths are specified and a series designated J to W of greater accuracy and with specifies ranges and overall length, which may be acceptable for testing by…
