Glass borosilicate types

The neutral glasses are generally less resistant than the hard borosilicate type, but are more easily melted and shaped. They are formulated so that the pH of aqueous solutions is unaffected by contact with the glass, making it particularly suitable in pharmaceutical use for the storage of pH-sensitive drugs. 

Digestion test tubes - 150 x 16 mm diameter, heavy wall (BS 3218) borosil-icate glass rimless type (Fisher Cat. No. TES-674-1 SOS). These should have graduation lines inscribed at 5 ml and 10 ml positions. 

Type of glass borosilicate Si02 (95 %) Si02 Si02... 

One exception is the special types of photostructurable glass. For the construction of microreactors, the borosilicate types of glass as well as fused silica are the most important ingredients. 

Effect of heat-treatment on density and constitution of high-silica-glasses of the borosilicate type. J. Am. Ceram. Soc. 31, 177 — 186 (1948). 

Table 6 shows the major metal oxides and the iron oxide impurity levels of typical borosilicate Type I glass. Up to 0.05% by weight (500 ppm) iron oxide as Fe O may exist in the borosilicate Type I glass. Thus, the increase in iron levels with time likely reflects a slow leaching of iron from the glass vial. Consistent with this explanation is that similar increases in silicon, aluminum, calcium, and barium levels are also observed in older product lots as shown in Table 6. Note that these nontransition metal ions are not known to participate in the type of reactions depicted in Figure 6. Furthermore, it is not clear if the expected increase in iron leaching from amber vials (Table 6) will be readily compensated for by the reduced light transmission at the causative wavelengths offered by utilizing the amber vial as the primary package.

The above considerations of the chemical durability and corrosion of glass were concerned with current types of silicate and borosilicate glasses. Special types of glass may exhibit quite different behaviour and also require special test methods. 

E-glass A multipurpose borosilicate type and the most commonly used glass for fiber... 

The wide chemical variation of radioactive wastes which are extremely complex in composition require different methods of immobilisation and containment. The waste forms range from Low Level Waste (LLW), Medium Level Waste (MLW) through to High Level Waste (HLW). MLW can be embedded in cement or bitumen whereas HLW is either reprocessing waste immobilised in borosilicate type glasses or is the spent fuel when declared as waste. 

Neutral-tinted Glass. A grey glass, usually of the borosilicate type these... 

E-Glass. A borosilicate glass the type most used for glass fibers for reinforced plastics suitable for electrical composites because of its high resistivity. (Also called electric glass ). 

Of the three commonly available types of glasses, borosilicate (Pyrex-type) glasses appear to be the most satisfactory. They combine the properties of good electrical resistance, resistance to thermal shock, and mechanical... 

Four column systems are available from Amersham Pharmacia Biotech that can be used to pack SEC media for various applications at the laboratory scale. These include C, XK, SR, and HR column systems. All of the laboratory-scale columns are constructed with borosilicate glass tubes. Columns for larger scale process applications include INdEX, BPG, EineLINE, BPSS, and Stack columns. The larger scale columns are constructed to meet stringent validation requirements for the production of biopharmaceuticals. Each of the column types are described. 

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