Borosilicate glass 3,3, DIN ISO 3507, Gay-Lussac type.

• Bottle and stopper (with capillary) are marked with unique matching identification number
• Top of stopper ground and polished, for ease of cleaning
• Individual certificate included
• Reference temperature: 20 °C

The density bottles (pycnometers) are individually adjusted. The nominal capacity is indelibly engraved on each bottle. Each bottle is calibrated with its own stopper. The volume in cm³ is specified to a precision of 3 decimal places.