ISO 4797:2015 pdf download

ISO 4797:2015 pdf download

ISO 4797:2015 pdf download,Laboratory glassware — Boiling flasks with conical ground joints
1 Scope
This International Standard specifies requirements for an internationally acceptable series of boiling flasks with conical ground joints for general laboratory purposes.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 383, Laboratory glassware — Interchangeable conical ground joints
ISO 718, Laboratory glassware — Thermal shock and thermal shock endurance — Test methods
ISO 1773, Laboratory glassware — Narrow-necked boiling flasks
ISO 3585, Borosilicate glass 3.3 — Properties
3 Types
The following three types of boiling flasks with conical ground joints are specified:
a) conical flasks;
b) flat-bottom flasks;
c) round-bottom flasks.
4 Series of capacities
Two series are specified for each type of boiling flask with conical ground joints. The series differ in height and in selection of joint sizes. It is recommended that, in national standards, one of these series is chosen.
5 Material
Boiling 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.
6 Dimensions
The external diameter of body of round-bottom flasks and flat-bottom flasks, the external diameter of body at the widest point of conical flasks and the minimum wall thickness shall comply with the dimensions specified in ISO 1773.
The nominal overall height of the boiling flasks with conical ground joints shall be as specified in Table 1, Table 2 and Table 3.
7 Ground glass joints
The sizes of the conical joints fitted to the boiling flasks shall be as given in Table 1, Table 2 and Table 3.The joints shall comply with the requirements of ISO 383, k6 series.
8 Thermal shock endurance
Boiling flasks with a nominal volume ≤3 000 ml shall have a thermal shock endurance of 150 °C and boiling flasks with a nominal volume >3 000 ml shall have a thermal shock endurance of 100 °C when tested in accordance with ISO 718.
9 Marking
The following inscriptions shall be permanently and legibly marked on all laboratory boiling flasks with conical ground joints:
a) nominal volume of the boiling flask, for example “100 ml”;
b) size of the conical ground joint, for example “29/32”;
c) manufacturer’s and/or vendor’s name and/or mark;
d) area with a surface suitable for marking with a pencil.
It is recommended that reference be made on each flask to this International Standard, for example by the inscription “ISO 4797”.