Classification by accuracy
There are two accuracy classes for volumetric glassware, A and B. Class B has twice the error limit of class A.
Scharlau class A glassware is always supplied with the corresponding Batch Certificate.
Error limits for the different classes have been established by certain DIN EN ISO directives which are indicated on each instrument.
Pipettes and burettes are also available as "swift delivery". In this case the instrument will be marked with "AS" instead of "A".
If we compare a standard class A volumetric pipette of 25 ml with one of swift delivery, the following delivery times would be observed:
|Clase A||Clase AS|
|Delivery time: 25-50 s||Delivery time: 15-20 s|
|Waiting time: 0||Waiting time: 5s|
Certificate of performance
All our class A and AS volumetric glassware comes with a certificate of performance contained in each box. This lot certificate has the lot number printed on each instrument. A certificate is issued with each lot and includes the ‘Mean Value’ and the ‘Standard Deviation’.
Quality assurance is based on compliance with the applicable European (EN) and International (ISO) Standards. Statistical Process Control (SPC) assists us in minimising the deviation from the nominal value (precision) and at the same time minimising the dispersion of the individual results (coefficient of variation).
All our burettes are Class AS and calibrated "to deliver" with a waiting time of 30 seconds and include a Schellbach stripe to enable better visualisation. All burettes include high contrast, ceramic enamel blue printed lines and inscriptions that are fused to the glass.
Our product range includes:
- Volumetric flasks
- One or two marks volumetric pipettes
- Graduated pipettes
- Burettes with glass, PTFE or PTFE spindle stopcock
- Measuring cylinders with spout or stopper