Percentage by weight

Brix hydrometer is graduated so that the number of degrees is identical with the percentage by weight of cane sugar and is used at the temperature indicated on the hydrometer. 

AATCC methods for determining water repeUency are AATCC 22 (spray test) and AATCC 70 (tumble jar dynamic absorption test). In the spray test, water is sprayed against the taut surface of the test specimen to produce a wetted pattern the size of which depends on the repeUency of the fabric. Evaluation is by comparing the pattern with a series of patterns on a standard chart. The latter method evaluates the percentage by weight of water absorbed by a sample after dynamic exposure to water for a specified period of time. 

Particle-Size Distribution This is defined as the relative percentage by weight of grains of each of the different size fractious represented in the sample. It is one of the most important factors in evaluating a screening operation and is best determined by a complete size analysis using testing sieves. 

The composition of the test solution should be controlled to the billest extent possible and be described as thoroughly and as accurately as possible when the results are reported. Minor constituents should not be overlooked because they often affect corrosion rates. Chemical content should be reported as percentage by weight of the solution. Molarity and normality are also nelpbil in defining the concentration of chemicals in the test solution. The composition of the test solution should be checked by analysis at the end of the test to... 

Supplier Notification. In 1989 and subsequent years, suppliers of facilities in SIC codes 20-39 are required to develop and distribute a notice if the mixtures or trade name products that they manufacture or process, and subsequently distribute, contain listed toxic chemicals. These notices are distributed to other companies in SIC codes 20-39 or to companies that sell the product to facilities in SIC codes 20-39. tf a Material Safety Data Sheet (MSDS) is not required for the mixture or trade name product, the notification must be in written form (i.e., letter or attachment to a MSDS). Otherwise, the notice must be incorporated into or attached to the MSDS for that product. The supplier notification requirement began with the first shipment of a product in 1989 and must accompany the first shipment each year thereafter. In addition, a new or revised notice must be sent if a change occurs in the product which affects the weight percent of a listed chemical or if it is discovered that a previous notice did not property identify the chemicals or the percentage by weight. For more information on supplier notification, see Appendix E. 

The percentage, by weight, of each toxic chemical (or all toxic chemicals within a listed category) contained in the mixture or trade name product. 

Change a mixture or trade name product by adding, removing, or changing the percentage by weight of a listed toxic chemicai. 

Discover that your previous notification did not properly identify the toxic chemicals in the mixture or correctly indicate the percentage by weight. 

Supply a new or revised notification within 30 days of a change in the product or the discovery of misidentilied toxic chemical(s) in the mixture or incorrect percentages by weight ... 

Your mixture or trade name product contains the toxic chemical in percentages by weight of less than the following levels (These are known as de minimis levels) ... 

Specific percentage by weight of a toxic chemical In the mixture or trade name product to be a trade secret, your notice to customers must contain a statement that the chemical Is present at a concentration that does not exceed a specified upper bound. For example, if a mixture contains 12 percent toluene and you consider the percentage a trade secret, the notification may state that the mixture contains toluene at no more than 15 percent by weight. The upper bound value chosen must be no larger than necessary to adequately protect the trade secret. 

Gravimetric analysis The chemical analysis of materials by the separation of the constituents and their measurement by weight. This describes the gas mixture by giving the percentage by weight of each component gas. See also Volumetric analysis. 

Rubber used in practical applications is crosslinked through disulfide (-S-S-) bonds, and is known as vulcanized rubber. Can you name another important class of polymers which are crosslinked through disulfide bonds Examine vulcanized rubber. How many individual strands does it comprise Are these strands of natural rubber or of gutta-percha What is the percentage (by weight) of sulfur incorporated into the polymer (The molecular weight of the sample is 1701 amu.) Does this classify as a low-sulfur polymer (<3%), a high-sulfur polymer (>10%) or in between ... 

Carbon residue is expressed as a percentage by weight of the original sample of the fuel, with the amount determined by burning a given quantity in a scaled container until all that remains is carbon residue. The amount of carbon residue left within the combustion chamber of the engine has a direct bearing upon the internal deposits and affects the cleanliness of combustion, particularly the smoke emissions at the exhaust stack. 

Elemental Composition of Natural Petroleum (Percentage by Weight) [55,56,57]... 

The available chlorine refers to the chlorine liberated by the action of dilute acids on the hypochlorite, and is expressed as the percentage by weight in the case of bleaching powder. Commercial bleaching powder contains 36-38 per cent of available chlorine. 

Fig. 9. Comparison of Eqs. (144) (solid line) and (145) (dashed line) with the experimental data of Calderbank and Moo-Young (C4) for the absorption of C02 at 25°C in water containing the following percentages by weight of glycerol [after Gal-Or and Walatka (G9)]...

BRIX The percentage by weight of the solids in a sucrose solution. 

Particularly useful is the physical classification of surfactants based on the hydrophile-lipophile balance (HLB) system [67,68] established by Griffin [69,70]. More than 50 years ago he introduced an empirical scale of HLB values for a variety of nonionic surfactants. Griffin s original concept defined HLB as the percentage (by weight) of the hydrophile divided by 5 to yield more manageable values ... 

Particle size (pm) Percentage by weight less than... 

Element Percentage (by weight) Element Percentage (by weight)... 

Section II Ingredients Ingredients/Name VX Percentage by Weight 100%... 

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