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-1||80.4% in weight SiO2|
|Strain point||520 ºC||13.0% in weight B2O3|
|Annealing point||560 ± 10 ºC||13.0% in weight B2O3|
|Softening point||820 ± 10 ºC||4.2% in weight Na2O|
|Density||2.23 ± 0.02 g/cm3||2.4% 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.