Labbox glassware, technical specifications - LabMaterials by Blanc-Labo SA

Labbox glassware, technical specifications

LBG 3.3 is a borosilicate glass with a minimum content in silica of 80% and a low expansion coefficient (3.3x0-6 K-1) included in the 3.3 borosilicate group, as defined in ISO 3585 standard.

It is used in products where chemical and mechanical resistance is to be combined with resistance to sudden temperature chan­ges. This particular combination of properties makes this type of glass the most used in labware.

Physical and chemical properties Typical composition
Linear expansion coefficient (@ 20/300 ºC)3.3x10-6 K-180.4% in weight SiO2
Strain point520 ºC13.0% in weight B2O3
Annealing point560 ± 10 ºC13.0% in weight B2O3
Softening point820 ± 10 ºC4.2% in weight Na2O
Density2.23 ± 0.02 g/cm32.4% in weight Al2O3
Hydrolytic resistance (according to ISO 719, water at 98 ºC)Class 1 
Hydrolytic resistance (according to ISO 720, water at 121 ºC)Class 1 
Resistance to acids (according to ISO 1776, DIN 12116)Class 1 
Resistance to alkalis (according to ISO 695)Class 2 

LBG N is a neutral borosilicate glass with a high chemical resistance. Its average linear dilation coefficient is 8.0•10-6 K-1. It is used in products not intended to be directly heated, but instead should have a higher mechanical resistance (such as mortars, desiccators, filtering flasks) or in some volumetric glassware (such as pipettes, burettes).

LBG A is a neutral borosilicate glass similar to LBG N but amber so to protect photosensitive products.

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