What is glass?
Glass is an inorganic mixture fused at high temperature which solidifies on cooling but does not crystallize. Its basic components, network formers and modifiers, are present in the common glasses in the form of oxides. Typical glass formers (network formers) are silicon dioxide (SiO2), boric acid (B2O3), phosphoric acid (P2O5) and, under certain circumstances, also aluminum oxide (Al2O3). These substances are capable of absorbing (dissolving) metal oxides up to a certain proportion without losing their glassy character. This means that the incorporated oxides are not involved in the formation of the glass but modify certain physical properties of the structure of the glass as “network modifiers”.
Every chemist looks for four important properties in laboratory glassware. It should have the ability to withstand chemical attack; it should not permit the release of ions which could cause problems; it should exhibit a high degree of accuracy in volumetric measurement; and it should be unaffected by heat and thermal shock. At Lab Equip Ltd, a company that can claim the longest and best experience in this connection, these properties are the result of optimized procedural steps. LEL glass is corrosion-resistant, impervious to gas (vacuum-tight) and resistant to aging, and it has a high thermal load capacity and a very high resistance to thermal shock. Continuous checks at the crucial stages of production guarantee a constantly high quality.
Quality from the very start
Right from the start with the selection of raw materials it is always quality and not the lowest price that is the main criterion. In addition to determining the boron, sodium and potassium content the raw materials are tested for undesirable traces of heavy metals using an analysis system developed at LEL. This involves the use of highly sensitive spectrophotometric analysis procedures that can determine traces of iron down to 0.1 ppm. That is the reason why LEL exhibits no release of iron even when subjected to the most sensitive analysis methods currently in use.
Test methods to DIN standards
Chemical resistance to water, acids and bases plus thermal expansion are important properties which LEL glass complies with. Chemists and glassblowers have a guarantee, comprehensible through control measurements, that they will encounter the necessary properties in the use of laboratory glass that they have to depend upon if their work is to be free of risk. The standardized ISO/R 719 and ISO 695 test methods indicated in DIN-ISO standard 35 85 are based on the German DIN standards 12 111 and 52 322. LEL manufacturers complies with these standards. In addition thermal expansion and transparency are analyzed in accordance with fixed test plans.
AT YOUR SERVICE
Keko Mwanga Area, Off Nyerere Road, Lab complex Plot No.966 Dar es Salaam, Tanzania.
The LEL customer Service Center(CSC) were designed to help our customer reduce their stockholding burdens. The LEL state-of-the-art sales office and warehouse complex, with more than thousands of different items stored in segregated area.