Materials classifying

Is die material classified as liighly toxic or toxic based upon die results of tests on laboratory animals e.g, LD50 or LC50 data. NOTE as described in Chapter 11, LD50 and LC50 arc referred to as the dose of a chemical that is lethal to 50 percent of laboratory test animals. 

Sintered and sprayed ceramic anodes have been developed for cathodic protection applications. The ceramic anodes are composed of a group of materials classified as ferrites with iron oxide as the principal component. The electrochemical properties of divalent metal oxide ferrites in the composition range 0- lA/O-0-9Fe2O3 where M represents a divalent metal, e.g. Mg, Zn, Mn, Co or Ni, have been examined by Wakabayashi and Akoi" . They found that nickel ferrite exhibited the lowest consumption rate in 3% NaCl (of 1 56 g A y at 500 Am and that an increase in the NiO content to 40mol 7o, i.e. O NiO-O-bFejO, reduced the dissolution rate to 0-4gA y at the expense of an increase in the material resistivity from 0-02 to 0-3 ohm cm. 

There is a wide variation in properties among the over 35,0000 commercially available materials classified as plastics. They now represent an important, highly versatile group of commodity and engineering plastics. Like steel, wood, and other materials, specific groups of plastics can be characterized as having certain properties. As with other materi-... 

Table 6.1 Materials classified on the basis of electrical conductivity.

Perfumes are complex mixtures of substances having dissimilar chemical properties. Considering one of the most important properties, from the perfumer viewpoint, the volatility, there are a large range of materials, classified into three classes Top notes or initial fragrance impression, body notes or middle... 

X The 3X decontamination level refers to solids decontaminated to the point that the agent concentration in the headspace above the encapsnlated solid does not exceed the health-based, 8-honr, time-weighted average limit for worker exposure. The limit for HD is 3.0 jg per cubic meter of air. Materials classified as 3X may be handled by qualified plant workers using appropriate procedures but cannot be released to the environment or sold for general public reuse. In specific cases in which approval has been granted, a 3X material may be shipped to an approved hazardous waste treatment facility for disposal in a landfill or for further treatment. 

Chemical analysis of the HF Treatment System Sludge Cake ( 18) indicates that this material is considered to be extremely hazardous solely because of its arsenic concent. Waste Extraction Tests (WET) indicate that this arsenic is in an extremely inert form and that even in its elevated concentration it produces a WET test result with a non-hazardous leachate. Our conclusion is that a 50 percent reduction in arsenic concent in the sludge cake would produce a solid material classified as non-hazardous by the State of California except for fluoride content. 

The card gap test is one of the important tests that has been accepted by the explosives industry to distinguish between a material classified as mass detonating, Military Class 1.1, and a material classified as a fire hazard only, Military Class 1.3 (Ref 47). The card gap test has been described in earlier sections (Vol 6, GI3-R ff), as have other tests on detonation and explosion criteria (Vol 4, D299-R ff) Electrostatic Sensitivity Tests... 

Fine-grained dolomite flour was used in the experiments. Raw material for testing was prepared on the basis of five commercially available size fractions of this material classified as <10, <15, <60, <100 and <250 pm. The particle size distribution of each fraction was determined using a laser particle size analyser Analysette 22 and described by the statistical moments. 

Two other samples yielded small quantities of arsenic. The eighth sample, which yielded the greatest amount of arsenic, was rough-sawn lumber, a material classified by the wood-treatment industiy as not acceptable for playground equipment. The CPSC concluded that the amounts of arsenic that people may be exposed to are below the level that may cause a health concern, and deemed it safe. 

COMTRADE. (2009). COMTRADE database, United Nation Statistics Division, New York, leading countries of import and export of MAP material classified as pharmaceutical plants (SITC.3 292.4 = commodity group HS 121190, HS1996). 

In a few cases, powders have been pelleted or formed in briquettes to eliminate dustiness and permit drying by through-circulation. Table 12-20 gives a list of materials classified by preforming methods suitable for through-circulation drying. 

The EPA controls the disposal of nonradioactive hazardous wastes. The Resource Conservation and Recovery Act of 1976 (RCRA) states that disposal of materials classifiable within any of the nine UN hazardous materials classes is enforced in such a way that health and safety professionals involved in the disposal of such materials are personally liable for each individual violation. 

Nevertheless, as already mentioned, esterquats replaced DHTDMAC in the early 1990s. This move, a voluntary initiative from the industry, allowed the use of materials not classified as dangerous for the environment instead of materials classified as very toxic to aquatic organisms and potentially having long-term effects on the environment. 

Some fillers are hazardous materials and require special handling and processing. Below are listed some fillers that are used or can readily be used in composite materials, classified according to the principal characteristics accepted in the industry. The indexes mean no hazard, 0 slight hazard, 1 moderate, 2 severe, 3 extreme hazard, 4. Storage area codes general, orange special, blue hazardous, red. 

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