Water-reactive liquid

Polyurethane grout supplied shall be water-reactive liquid polyurethane base solutions which when reacted expand by foaming to at least seven (7) times the initial liquid volume and when set produce a flexible, closed void solid resistant to degradation by wet and dry cycles and chemicals found in concrete construction. Specific waterproofing grouts meeting these requirements are marketed by the following manufacturers.... ... 

METHYL DICHLOROACETATE (116-54-1) CJH4CI2O2 Combustible, water-reactive liquid (flash point 176°F/80°C). Contact with water causes heat and decomposition to corrosive dichloroacetic acid. Aqueous solution is an acid. Incompatible with sulfuric acid, alkalis. 

METHYL DICHLOROETHANOATE (116-54-1) C3H4CI2O2 Combustible, water-reactive liquid (flash point 176°F/80°C). Contact with water causes heat and decomposition to corrosive dichloroacetic acid. Aqueous solution is an acid. Incompatible with sulfuric acid, alkalis, ammonia, aliphatic amines, alkanolamines, alkylene oxides, amides, epichlorohydrin, organic anhydrides, isocyanates, vinyl acetate. Strong oxidizers may cause fire and explosions. Attacks metals in the presence of moisture. Thermal decomposition releases toxic phosgene and HCl gases. 

OXYBIS (CHLOROMETHANE) (542-88-1) C2H4CI2O Highly flammable and water-reactive liquid. Forms explosive mixture with air (flash point <66°F/<19°C Fire Rating 3). Contact with acids or water causes decomposition, forming... 

Hazard Class 4 is composed of flammable solids. Additionally, some pyrophoric and water-reactive liquids are included under the 4.2 Spontaneously Combustible and... 

Water-Reactive Liquid, corrosive. 3129 39 Zinc Dithionite 1931 32... 

Water-Reactive Liquid, poisonous. 3130 39 Zinc Metal, powder or dust 1436 76... 

In mass polymerization bulk monomer is converted to polymers. In solution polymerization the reaction is completed in the presence of a solvent. In suspension, dispersed mass, pearl or granular polymerization the monomer, containing dissolved initiator, is polymerized while dispersed in the form of fine droplets in a second non-reactive liquid (usually water). In emulsion polymerization an aqueous emulsion of the monomer in the presence of a water-soluble initiator Is converted to a polymer latex (colloidal dispersion of polymer in water). 

Chemical Reactivity - Reactivity with Water Solid has very slow reaction no hazard. Liquid spatters when in contact with water Reactivity with Common Materials No reaction Stability During Transport Stable Neutralizing Agents for Acids and Caustics Water and sodium bicarbonate Polymerization Not pertinent Inhibitor of Polymerization Not pertinent. 

The product is a water-white liquid with an obnoxious odor. It boils at 150°/760 mm. It is reactive toward water and amines, and reacts slowly with atmospheric oxygen. On long standing, it deposits small amounts of dimethylammonium chloride. 

One difference between water and liquid ammonia involves the reactivity of group IA metals. For example, potassium reacts very vigorously with water,... 

Substances that are water-reactive will nearly always be identified as such on their MSDSs or ICSCs. They may be identified as DOT/UN Hazard Class 4.3 materials for shipping purposes and labeled as dangerous when wet. However, some water-reactive materials are classified otherwise. Acetic anhydride is designated Class 8 it may also be identified as a combustible liquid. 

NFPA 325, Fire Hazard Properties of Flammable Liquids, Gases, and Volatile Solids, gives NFPA Instability Ratings and indications of water reactivity for flammable liquids, flammable gases, and volatile flammable solids. 

A chemical for which there is scientifically valid evidence that it is a combustible liquid, a compressed gas, explosive, flammable, an organic peroxide, an oxidizer, pyrophoric, unstable (reactive) or water-reactive. 

In the strict chemical sense, the term drying refers to removal of water present in solid or fluid materials by treatment with water-reactive chemicals. In a wider (chemical engineering) context, it also refers to use of physical methods to remove any unwanted liquids (or vapours) from solid, liquid or gaseous phases. 

For small-scale experiments, the LNG and liquid refrigerant cases are analyzed using a model which assumes that the volatile liquid (or some part of it) is superheated to a temperature at which homogeneous nuclea-tion occurs. Such nucleation is very rapid and the event resembles an explosion. An attempt is made to employ this same model to explain R s in the water-smelt, water-aluminum, and water-reactive metal cases, but data to make definitive conclusions are lacking. 

The original hydrothermal method involves heating the reactants in a closed vessel, an autoclave, with water (Figure 3.5). An autoclave is usually constructed from thick stainless steel to withstand the high pressures, and is fitted with safety valves it may be lined with non-reactive materials such as teflon. The autoclave is heated, the pressure increases, and the water remains liquid above its normal boiling temperature of 373 K, so-called super-heated water . These conditions, in which the pressure is raised above atmospheric pressure and the temperature is raised above the boiling temperature of water (but not to as high a temperature as used in the... 

Weber, Handbook of Selected Properties of Air- and Water-Reactive Materials , RDTR No 144, NAVAMDEP, Crane (1969), 25-26 18) R.Kh. Kurbangalina, Dependence of Critical Diameter of Liquid Explosives on Content of Powders , LA-TR-20-8, translated by H. Dahlby from ZhPriklMekhTekhFiz (4), 133-36 (1969) CA 71,126697 (1969) 19) A.S. Derzhavets,... 

Flexible foam is made from long-chain diols with a small amount of triols for cross-linking to give strength and resilience. Foaming is produced by reaction between measured amounts of isocyanate and water to liberate carbon dioxide. Molded products are made by pouring the reactive liquid mixture into a mold cavity at 50°C. They foam and cure in 2-10 min, after which they are temporarily crushed or vacuum-shocked to open the cell walls and insure softness. Then they are allowed to condition for several hours to finish the cure. The major products are auto seating and headrests, and furniture cushions. 

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