AS 4716.1-2002 pdf free.Laboratory glassware – Bottles Part 1: Screw-neck bottles.
5 Construction
5.1 Material
5.1.1 Bottles shall be constructed of clear, colourless or amber borosilicate glass 3.3 in accordance with
ISO 3585.
5.1.2 Internal stress and visible defects in the glass (such as bubbles near the surface) shall be reduced to a level sufficient to minimize the possibility of fracture due to thermal or mechanical shock.
5.2 Design
5.2.1 The base of the bottle shall be constructed so as to enable the bottle to stand firmly on a flat surface without rocking or spinning.
5.2.2 The base of the bottle shall have a suitable radius so as to provide a smooth transition between the base and the side. The main portion of the side shall be:
— cylindrical for bottles with nominal capacities of 25 ml to 2 000 ml;
— slightly tapered for bottles with nominal capacities 5 I to 20 I with the smaller diameter at the base of the bottle.
The diameters 6 shall be as given in Table 1.
5.2.3 The shoulder of the bottle shall have a suitable radius in order to provide a smooth transition between the side and the conical upper proportion of the bottle.
5.2.4 The upper portion of the shoulder shall be of conical shape. The transition radius from the shoulder to the neck shall be as small as possible to be compatible with good manufacturing practice.
5.2.5 The bottle shall be blown so as to evenly distribute the glass in the mould avoiding sudden changes in the wall thickness. The thinnest areas shall not have a thickness less than the minimum value specified in Table 1.
5.2.6 The neck of the bottle shall be stoutly constructed and finished with a strengthening lip designed to facilitate pouring without liquid running down the outside of the bottle. A clip-on anti-drip ring of plastics material fitting into a slightly recessed channel on the outside of the neck is a permitted alternative form of construction.
NOTE There are suitable national standards for the dimensions and design of the thread of the screw neck.
5.2.7 The outer glass surface of the bottles may be coated with a suitable plastics material as a protection and to
limit leakage of liquid if the bottle is damaged. The coating shall be resistant to steam sterilization at 135 °C.
5.3 Closures
Bottles shall be provided with closures of a suitable inert plastics material, for example polypropylene. Closures shall form a liquid-tight seal with the threaded bottle neck.AS 4716.1 pdf download.