BS EN ISO 24450 pdf download

BS EN ISO 24450 pdf download Laboratory glassware — Wide-necked boiling flasks
1 Scope
This International Standard specifies requirements and dimensions for an internationally acceptable series of conical flasks and of flat-bottom and round-bottom flasks with wide neck for general laboratory purpose. The flasks are provided for
⎯ direct use in laboratory, fitting together with other equipment for general laboratory purposes;
⎯ further work up to other products.
NOTE For narrow-necked boiling flasks, ISO 1 773 applies. For boiling flasks with conical ground joints, see ISO 4797.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3585, Borosilicate glass 3.3 — Properties
3 Series and capacities
3.1 Series of nominal capacity
The series of nominal capacities of wide-necked conical flasks is as follows (given in millilitres):
50 — 1 00 — 250 — 500 — 1 000
The series of nominal capacities of wide-necked round-bottom flasks is as follows (given in millilitres):
50 — 1 00 — 250 — 500 — 1 000 — 2 000 — 4 000 — 6 000 — 1 0 000
The series of nominal capacities of wide-necked flat-bottom flasks is as follows (given in millilitres):
50 — 1 00 — 250 — 500 — 1 000 — 2 000
3.2 Nominal capacity
The nominal capacity of a flask is the value, selected from the series given in 3.1 , which is closest to but not larger than the actual volume to the base of neck.
NOTE The body dimensions recommended in Tables 1 and 2 take this requirement into account.
4 Material
Flasks shall be made from borosilicate glass 3.3 in accordance with ISO 3585, and shall be free from visible defects which might affect performance, and free from any internal stress which would impair the performance of the flask.
5 Construction and dimensions
5.1 Construction
5.1.1 Stability
Conical flasks and flat-bottom flasks shall stand vertically without rocking or spinning when placed on a level surface.
5.1.2 Neck
The neck of the flask shall be substantially circular in cross-section and the mouth of the neck shall not be belled to any considerable distance from the top. The top of the neck shall be suitably strengthened.
5.2 Dimensions
5.2.1 Recommended dimensions
Dimensions for wide-necked conical flasks are given in Table 1 .