Cement (Classes A through J) meeting the applicable requirements of API Spec 10. ASTM Types: Cement (Types I through V) meeting the applicable requirements of Standard Specifications for Portland Cement ASTM C150. Common, Regular or Ordinary: A cement intended for use under conditions not requiring moderate to high sulfate resistance. Corresponds to API Class A or Class C which are similar to ASTM Type I or Type III cements, respectively. Construction: See Common, Regular or Ordinary. Gel Cement: A cement or cement slurry that has been modified by the addition of bentonite. Gypsum Cement: Composed primarily of the hemihydrate form of calcium sulfate, CaSO4  1/2H20 (Plaster of Paris) High Alumina: See Calcium Aluminate Cement. High Early: (a): API Class C cement; (b) ASTM Type III cement. High Temperature: A cement designed to overcome strength retrogression within the temperature limits designated by the supplier. Hydraulic Cement: A cement that sets and hardens by chemical interaction with water and that is capable of doing so under water. Modified Cement: A cement whose properties, chemical or physical, have been altered by additives. This term has been used to refer to specific formulations of gel cement containing certain concentrations of dispersing agent. Neat: A cement paste or slurry containing no additives. Well: Cement or mixture of cement with other materials that is intended for us in oil, gas, geothermal or water wells. Ordinary: See Common, Ordinary or Regular Cement. Portland: Hydraulic cement produced by pulverizing clinkers consisting essentially of hydraulic calcium silicates and usually containing one or more of the forms of calcium sulfate as an interground addition. Portland-Blast Furnace Slag: An intimate and uniform blend of Portland cement (or clinker) and fine granulated blast furnace slag in which the amount of slag is within specified limits. Portland-Pozzolan: A hydraulic cement consisting of an intimate and uniform blend of Portland cement or portland blast furnace slag cement and fine pozzolan produced by intergrinding portland cement clinker and pozzolan, by blending portland cement or portland blast furnace slag cement and finely divided pozzolan, or a combination of intergrinding and blending, in which the amount of the pozzolan constituent is within specified limits. Regular: See Common Ordinary or Regular Cement. Retarded Cement: A cement in which the thickening time is extended by adding a chemical retarder. Slag Cement: See Granulated Blast Furnace Slag. Slow-Set Cement: A cement in which the thickening time is extended by (1) eliminating the rapid hydrating components in its composition or (2) by adding a chemical retarder. API Classes D, E, and F are slow-set cements. Suflate-Resistant Cement: Cements which meet applicable requirements of API Spec 10. Weighted Cement: A cement slurry containing additives to increase its normal density. (Bul 10C)