Hardening classification

Other countries have similar types, some classifications, as in Germany, are based on age-strength levels by standard tests (70). A product made in Italy and Prance known as Perrari cement is similar to Type V and is sulfate-resistant. Such cements have high iron oxide and low alumina contents, and harden more slowly. 

Table 6.1 Organic additives in mortars and their classification by their effects on fresh and hardened mortars. Some of the protein additives are matched into more, sometimes even contradicting, categories, due to their different influence on fresh and moderately hardened mortars [22,24]...

Hard and soft acid and base (HSAB) principle, 16 780 Hard blacks, 21 775 Hard-burned quicklime, 15 28 Hard coals, 6 703 classification, 6 712 Hard copper alloys, 7 723t relief annealed, 7 723t Hard copy systems, 9 513-514 Hard core repulsion, 23 93 Hard-elastic olefin fibers, 11 242 Hardenability, of steel, 23 283—284 Hardened MF resins, analysis of,... 

PMDA, 20 266. See also Polymeric methylenedianiline (PMDA) PMDA-ODA, gel casting of, 20 271-272 PMDA-ODA structures, 10 214 PMDI polymeric isocyanate, 25 456, 457, 462. See also Polymeric methylene diisocyanate resins (PMDI) rigid polyurethanes from, 25 471-472 PMF/PMUF resins, 15 779 PMF resins, hardening of, 15 781 PMMA ionomer, 4DA and, 14 479 PM optimization (PMO), 15 466 PM process, 21 50 Pneumatic classification, 22 288 health and safety factors related to,... 

Of course, in any classification system areas of overlap are unavoidable. Some size enlargement processes involve more than one agglomeration mechanism. For example, thermal after-treatment is quite common to harden... 

Provide information on other hazards which do not result in classification but may contribute to the overall hazards of the material, for example, formation of air contaminants during hardening or processing, dust explosion hazards, suffocation, freezing or environmental effects such as hazards to soildwelling organisms. 

For engineering purposes, the most useful classification of polymers is based on their thermal (thermomechanical) response. Under this scheme, polymers are classified as thermoplastics or thermosets. As the name suggests, thermoplastic polymers soften and flow under the action of heat and pressure. Upon cooling, the polymer hardens and assumes the shape of the mold (container). Thermoplastics, when compounded with appropriate ingredients, can usually withstand several of these heating and cooling cycles without suffering any structural breakdown. This behavior is similar to that of candle wax. Examples of thermoplastic polymers are polyethylene, polystyrene, and nylon. 

This classification is based upon the chemistry of hardening process, however, some reservations, as it will be fiuther mentioned, shonld be pointed ont. 

Figure 1. Classification of hardening processes in polymer systems.

In order to evaluate HETA, two case-study applications based on a 6 x 6 matrix multiplication algorithm and a bubble sort classification algorithm were chosen to be hardened. 

Coumarin, 3(3-(4-biphenylyl)-1,2,3,4-tetrahydro-1-naphthyl)-4-hydroxy-. See Difenacoum, Coumarin, 7-diethylamino-4-methyl-. See 7-Diethylamino-4-methyl coumarin Coumarin, 7-hydroxy. See 7-Hydroxycoumarin Coumarin, 4-hydroxy-3-(1,2,3,4-tetrahydro-1-naphthyl)-. See Coumatetralyl cis-o-Coumarinic acid lactone Coumarinic anhydride. See Coumarin Coumarone. SeeCumarone Coumarone/indene copolymer. See Coumarone/indene resin Coumarone/indene resin CAS 35343-70-5 63393-89-5 Synonyms Coumarone/indene copolymer Coumarone resin Indene/coumarone resin Poly (coumarone-co-indene) Polyindene resin Classification Thermosetting resin Properties Brn. solid soft and sticky at R.T. hardens on heating to solid sol. in hydrocarbon soivs., pyridine, acetone, carbon disulfide, CCU insol. in water, alcohol dens. 1.140 soften, pt. 

CAS 61788-62-3 EINECS/ELINCS 262-990-2 Synonyms Dicocoalkyl methylamine Classification Dialkyl methylamine Properties Cationic Uses Chemical intermediate for quat. ammonium derive., acid scavenger in petrol, prods. epoxy hardener, catalyst in mfg. of flexible PU foams surfactant industrial detergent chemical intermediate for mfg. of oil-sol. betaines and quat. ammonium salts in cosmetics... 

Classification Tertiary aliphatic amine Formula R-N(CH3)2, R represents hydrogenated tallow radical Properties Cationic Toxicology TSCA listed Uses Chemical intermediate, raw material for surfactants emulsifier, antistat, emulsion stabilizer in cosmetics in textiles acid scavenger in petrol, prods. epoxy hardener catalyst in mfg. of flexible PU foams Trade Name Synonyms Amine 2MHBGD [Akzo Nobel Surf. Chem. AB... 

Tallow, hardened Tallow, hydrogenated. See Hydrogenated tallow Tallow hydroxyethyl imidazoline CAS 90411-99-7 EINECS/ELINCS 291-479-7 Synonyms 1H-lmidazole-1-ethanol, 4,5-dihydro-, 2-nortallow alkyl derivs. Tallow imidazoline Classification Heterocyclic compd. 

The classification of adhesives by hardening mechanism (Table 1) is probably the most informative, but a classification based on the chemical nature of the main polymer present is often used. Such systems require little explanation and might typically order materials first by the class of polymer, thermoset, thermoplastic or (thermoset) elastomeric, often with a separate class for natural polymers, and then snbdivide these classes according to the chemical structure. Table 2 shows how this might be accomplished. 

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