Part per weight

Several blends of colorants were established in order to prodnce desired hnes. To obtain orange color, one mnst mix the following colorants (parts per weight shown in parentheses) Allnra Red (25), Tartrazine (20), and Sunset Yellow (55). Food applications must take into account the fact that various colorants have different properties or can suffer chemical modifications in the specific conditions inherent in a food product. In such cases, the blend composition and color measurements must made in the product intended to be colored. ... 

Eighty-four parts per weight WO3 and 16.5 parts carbon are mixed for 1 hour in a Hensell mixer. Twenty-three parts water are added and the mixture is extruded (1.2 mm diameter) and cut every 3rd mm and dried (<0.1% H2O). The pellets are fed into the first rotary furnace and flow automatically from there into the second by gravity. 

PAES polyaryl ether sulphone pbw parts per weight... 

PVC-P, on average, contains 55 phr (parts per weight per hundred of PVC) plasticiser. PVC has the ability to accept high levels of plasticiser (100 phr and even above). The most common plasticisers that are used today in PVC are DOP (nsed in the mannfacture of flooring and carpet tiles), DEHP (used mainly for any flexible PVC applications), di-isodecyl phthalate (DIDP), used mainly in wire and cable production, carpet backing and pool liners, di-isononyl phthalate (DINP), and butyl benzyl phthalate (used mainly in vinyl tile production), and di-n-hexyl phthalate (used in flooring applications). There are also several plasticisers that are specific for almost no toxicity, such as tri-(2-ethylhexyl) trimellitate (TEHTM), a polymeric adipate, and acetyl triburyl citrate (ATBC), which are economically unfeasible for their industrial applications, i.e., TEHTM is some three times as expensive as DEHP, and polymeric adipate four times as expensive. Analytical techniques are available to detect traces of plasticisers at the parts per billion level [43]. 

Preparation of Pb(CH3)4 from PbNa Alloy (= 100 parts per weight) and CH3CI in Pressure Reactors. 

No. conditions (parts per weight CH3CI) catalyst system (parts per weight) and remarks Pb(CH3)4 (yield in %) Ref. 

No. composition of the electrolyte and remarks (parts per weight) temperature in volt (current density) yield in % (A-h) Ref. 

A satisfactory bath suitable for temperatures up to about 250° may be prepared by mixing four parts by weight of 85 per cent, ortho-phosphoric acid and one part by weight of meta-phosphoric acid the mixed components should first be heated slowly to 260° and held at this temperature imtil evolution of steam and vapours has ceased. This bath is liquid at room temperatures. For temperatures up to 340°, a mixture of two parts of 85 per cent, ortho-phosphoric acid and one part of meta-phosphoric acid may be used this is solid (or very viscous) at about 20°. 

Solubility is given in parts by weight (of the formula weight) per 100 parts by weight of the solvent (i.e., percent by weight) and at room temperature. Another unit frequently used is grams per 100 mF of solvent (mF per 100 mF for liquids and gases). The symbols of the common mineral acids represent aqueous solutions of these acids. 

The units of concentration most frequently encountered in analytical chemistry are molarity, weight percent, volume percent, weight-to-volume percent, parts per million, and parts per billion. By recognizing the general definition of concentration given in equation 2.1, it is easy to convert between concentration units. 

A 200.0-mL sample of water was filtered through a preweighed glass fiber filter. After drying to constant weight at 105 °C, the filter was found to have increased in mass by 48.2 mg. Determine the total suspended solids for the sample in parts per million. 

The thermodynamic properties of Tefzel 200 and 280 are shown in Table 2 the annual rate of loss of weight with thermal aging for Tefzel 200 ranges from 0.0006 g/g at 135°C to 0.006 g/g at 180°C after an initial loss of absorbed gases of 0.0013 g/g at elevated temperature. The excellent thermal stabihty of ETEE is demonstrated by aging at 180°C at this temperature, the annual weight loss of six parts per 1000, or a 1% weight loss, takes almost two years. 

Health and Safety. Remover formulas that are nonflammable may be used in any area that provides adequate ventilation. Most manufacturers recommend a use environment of 50—100 parts per million (ppm) time weighted average (TWA). The environment can be monitored with passive detection badges or by active air sampling and charcoal absorption tube analysis. The vapor of methylene chloride produces hydrogen chloride and phosgene gas when burned. Methylene chloride-type removers should not be used in the presence of an open flame or other heat sources such as kerosene heaters (8). 

Ingredient Parts by weight Parts per hundred resia (phr) % By weight... 

Of the surface of the earth, 71% (3.60 x 10 km ) is covered by oceans their average depth is 6 km and their volume is 8.54 x 10 km . Unfortunately, this huge quantity of water is not suitable for very many human uses. Water with over 1000 ppm (parts per million by weight, or mg/L) salt is usually considered unfit for human consumption, and water with over 500 ppm is considered undesirable, but ia some parts of the world, people and land animals are forced to survive with much higher concentrations of salts, sometimes of over 2500 ppm. 

Because pulp bleaching agents are, for the most part, reactive oxidising agents, appropriate precautions must be taken in their handling and use. For example, it is important to ensure that the threshold limit values (TLV) (20) in Table 2 are not exceeded in the workplace air. These are airborne concentrations in either parts per million by volume under standard ambient conditions or mg per cubic meter of air. They "represent conditions under which it is beUeved that nearly all workers may be repeatedly exposed, day after day, without adverse effect" (20). TWA refers to a time-weighted average for an 8-h workday STEL is a short-term exposure limit or maximum allowable concentration to which workers can be continuously exposed for 15 minutes. 

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