Container materials glass

This section includes the most important container materials glass, plastic, and elastomers and addresses the contamination issues for injectable formulations. 

Container Insulation Tanks containing materials above atmospheric temperature may require insulation to reduce loss of heat. Almost any of the commonly used insulating materials can be employed. Calcium silicate, glass fiber, mineral wool, cellular glass, and plastic foams are among those used. Tanks exposed to weather must have jackets or protective coatings, usually asphalt, to keep water out of the insulation. 

The production of silicate glasses and glass-containing materials... 

The important influence that sample container materials can have on seawater sample composition is illustrated next by two examples one concerning the storage of metal solutions in glass and plastic bottles, the other concerning the storage of solutions of phthalic acid esters and polychlorinated biphenyls in glass and plastic. 

Polyethylene is another common container material. Polyethylene bottles are suitable for most solids and aqueous samples. When used for aqueous samples, unlike glass there will be no leaching of elements such as Na, K, B and Si. For best results when determining metal ions in aqueous samples, the sample should be acidified to avoid precipitation of the ions. 

The experiments were conducted in "solubility tubes" each containing two glass marbles. The tubes were rotated at 25.00 0.02°C to keep the material finely ground. 

The starting material (batch) after appropriate homogenization should be stored in appropriate containers. Later these containers would be distributed to the interested scientists in order to support their measurements. Of course, first, the appropriate containers, in terms of size (large, small), shape (bottle, vial), properties (hard, soft, coloured), material (glass, plastic) have to be selected. Some other important items at this stage are the preparation of the units imder the appropriate conditions (e.g. freeze-dried material tmder low humidity), each unit should contain an appropriate amount of material (depending on the amoimt needed for each measurement and the availability of the material) and the appropriate number of units has to be decided (taking into account the needs for this specific certified reference material). 

As for container material, polypropylene containers are as satisfactory as glass ones in compound stability and recovery. Since water is more harmful than oxygen to compound degradation and the hygroscopic nature of DMSO favors water uptake, humidity control is a key parameter to ensure compound storage stability. 

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