Glasses recommended material

Recommended materials of constmction for pipes, tanks, and pumps handling citric acid solutions are 316 stainless steel, fiber glass-reinforced-polyester, polyethylene, polypropylene, and poly(vinyl chloride). At elevated temperatures, 304 stainless steel is not recommended (Table 8). 

This may even lead to blockage owing to accumulation of corroded material in the tube. In [38] it is also claimed that steels are not suited for nitration however, since the grade of the steel employed is not given, it cannot be excluded that high-alloy steels may behave better. Silicon, glass and titanium are recommended materials [38]. 

Recommended materials for wa-terproofing Paper, cardboard, glass, staple and cotton cloth, metals... 

GC/MS interfaces constructed of all glass or glass-lined materials are required. Glass can be deactivated by silanizing with dichlorodimethylsilane. Inserting a fused silica column directly into the MS source is recommended care must be taken not to expose the end of the column to the electron beam. 

Suggested design for water-jacketed Pyrex spectrophotometer cell containing iodine. The recommended material for the main part of the jacket is Delrin, which can be easily machined. The outer windows may be either glass or clear plastic. 

Oxygen difluoride T O Glass, stainless steel, copper, Monel or nickel s 200°C At higher temperatures only nickel and Monel are recommended materials... 

The recommended material of construction for pumps is stainless steel. The use of pumps with packed glands that require lubricants is not recommended but instead use of pumps with mechanical seals with wetted parts made from ceramic/glass-filled polytetrafluorethylene. Ball valves should be used, with suitable arrangements for releasing pressure of gas built up from decomposition of H2O2 trapped in the valve. Thus, acceptable valves have a seat, usually polytetrafluorethylene, which lifts at a predetermined pressure or, alternatively, a small hole drilled in the ball so that in the "off position the channel through the ball is in communication with the upstream liquid side. 

This temperature profile is recommended when fast heating of material is required, e.g., fast cycle times, long (entire) screw stroke or screws with a deep flight. This profile setting ensures that the material is evenly heated and is completely molten before injection. When using glass-filled material this profile can reduce wear and tear of the cylinder assembly. 

Htfely stored whilst dry, but this is not recommended in the interest of Safety. Under no circumstances should glass stoppers be employed for potentially explosive substances, since on replacing the stopper some of the material may be ground between the stopper and the neck of the bottle and an explosion may result. 

Sulfurchlorination of unsaturated compounds or mercaptans is normally carried out at atmospheric pressure in a glass-lined reaction vessel because of the potential to Hberate HCl during the reaction. The sulfurchlorination vessel is equipped with a cooling jacket or coils (very exothermic reaction), a nitrogen or dry air sparging system, an overhead condenser, and a caustic or bleach scmbber. If one of the reactants (olefin or mercaptan) is alow boiling material, ie, isobutylene, a glass-lined pressure vessel is recommended. 

The manufacturers stress ease of processing as a particular feature of the material. Recommended melt temperatures are in the range 320-340°C and mould temperatures are 135-165°C. Mould shrinkage of glass-filled grades is usually of the order of 0.2-0.4% in the flow direction and up to twice this value in the transverse direction. The materials are notable for their ability to withstand vapour phase and infrared soldering processes. 

Indicate, if known, preferred bag material that will withstand environment, e.g., fibers of glass, polyester, Teflon , Nomex , polypropylene, polyethylene, cotton, wool, nylon, Orion , Dacron , and Dynel . The type of weave of fiber should be recommended by the manufacturer. The fabrics may be felted or woven [47,48] in weaves of plain, satin, or twill, and should be resistant to any corrosive material in the solid particles or the gas stream. 

Because of the corrosiveness of the reaction media, ceramic materials, glass, graphite, rigid-type PVC, and enameled or coated steel are recommended for pipes, cocks and valves, pumps, and cooling systems. 

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