Caps & Vials

VMAX vials

VMAX vials for optimised residue emptying for vials larger than 32x12mm.
The special feature of VMAX vials is the cylindrical base. It is designed for the removal of liquids by means of a cannula with as little dead volume as possible. VMAX vials are designed to allow automated withdrawal.

Optimised residual emptying for each vial – VMAX sample vials

VMAX – Microvial stands without support
with optimised residual emptying
Ideal for automated sample preparation
Residual volume approx. ≤ 7 μ

In addition to the range of pre-produced VMAX shown here, the VMAX base can be machine formed from 1000 bottles to almost any bottle with a maximum diameter of 27mm and a length of 140mm.

We will be happy to advise you on the topic.

VMAX - Description

The bottom makes the VMAX vial special. It is cylindrically shaped and can be moulded to any glass bottle, even retrofitted, and by machine using the patented process of GTG Glastechnik Gräfenroda.

Automated systems for taking samples usually dip into the vial with a cannula. The inlet of the cannula can be either lateral or at the bottom, and the head of the cannula can also vary. During automatic withdrawal, the cannula is always immersed to the same depth in the vial. For the most complete emptying possible and low dead volume, the cannula must be immersed as deeply as possible in the vial without touching the bottom!

A reproducibly thick bottom is therefore decisive for a low dead volume! Optimal emptying down to a residual volume of approx. ≤ 7µl is possible under optimal conditions.

VMAX vials can be used in a variety of ways. For example, the storage of valuable samples or medicines. For analyses of special samples or as a reaction vessel, for example in the bilimex range

VMAX - cylindrical foot

GTG Glastechnik Gräfenroda has mathematically proven the advantages of the conical bottom compared to a cylindrical bottom.

In a conical design, the dead volume forms a truncated cone with the side angle a.

The dead volume for the tapered version is
VKS = π * h/3 (3r2 + h2 tan2(a) + 2r * h* tan(a))

In the cylindrical version – as manufactured by Glastechnik Gräfenroda GmbH (GTG) – the dead volume forms a cylinder.

The dead volume for the cylindrical version type GTG is only:
VZyl = π * r2 * h

The following example for the dead volume up to the needle entry opening
r = 1.5 mm, h = 1.5 mm and a = 45° -> tan(a) = 1
VKS= 21.2 μl
VZyl = 10.6 μl

That is, the dead volume of the tapered version is larger by the proportion π * h/3 (h2 * tan2 (a) + 2rh * tan(a)).
For an angle a greater than 45°, the tan(a) > becomes 1 and grows all the more significant.

The same result applies if the overlap of the needle opening with sample is required.
It is then valid for the height h = height h (needle above ground) + ü (cover sample).

as an example, the following applies for the dead volume up to the overlap
r = 1.5 mm, h = h + ü = 1.5 mm + 2.0 mm = 3.5 mm and a = 45° -> tan(a) = 1
VKS= 108.1 μl
VZyl = 24.7 μl

VMAX - Standard range

The installation of the optimised residual emptying system is also possible in existing vials from 1,000 units upwards. possible without any problems. The following vials are usually available from stock.

ND13 Screw VMax Vial

Article no.	KG/BG	Volume	Height	Ø
120-0461535	KG	3,5 ml	45 mm	14 mm
120-0461504	BG	3,5 ml	45 mm	14 mm

ND15 Screw VMax Vial

Article no.	KG/BG	Volume	Height	Ø
120-0461573	KG	9,5 ml	65 mm	19 mm
120-461566	BG	9,5 ml	65 mm	19 mm

ND24 Screw VMax Vial

Article no.	KG/BG	Volume	Height	Ø
120-0461672	KG	19 ml	57 mm	27 mm
120-0461658	BG	19 ml	57 mm	27 mm
120-0461719	KG	39 ml	95 mm	27 mm
120-0461696	BG	39 ml	95 mm	27 mm
120-0461757	KG	59 ml	140 mm	27 mm
120-0461733	BG	59 ml	140 mm	27 mm

ND20 Headspace Vial with Crimp Head

The high-quality headspace vials with VMAX bottom offer an innovative solution for the analysis of volatile or slightly volatile compounds in chromatography with guaranteed complete sample collection.