Reference

Improved nonflammable and electrically conducting organomineral foams

Improved nonflammable and electrically conducting organomineral foams. (Chemie-Anlagenbau Bischofsheim G.m.b.H.Several substances are used for example 101-68-8 and 61604-27-1 which are their cas registry numbers.; Reuter Technologie G.m.b.H., Ger.). Ger. Offen. DE 2518192 4 Nov 1976, 16 pp. Addn. to Ger. Offen. 2,460,834. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08G085-00. APPLICATION: DE 75-2518192 24 Apr 1975. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Fabrication and Uses) In the manuf. of organomineral foams from water glass [1344-09-8] solns. and compds. contg. .gtoreq.2 NCO groups, flame resistant foams with improved properties are obtained by adding to the reaction mixt. a compd. that lowers the pH of the water glass soln. and acts as a hardener and a zwitterionic compd. Thus, a mixt. contg. water glass (48-50.degree. Baume; Na2O-SiO2 ratio 2.68) 50, 2,4,6-tris(dimethylaminomethyl)phenol [90-72-2] 3, and Celatom MW 31 diatomaceous earth 5 parts was added to a compn. contg. polyphenylpolymethylenepolyisocyanate [9016-87-9] 12, silicone oil foam stabilizer 0.2, trichlorofluoromethane [75-69-4] 8, Phosgard 2XC20 [(ClCH2CH2O)2P(O)OCH2C(CH2Cl)2CH2CH2CH2OP(O)(OCH2CH 2Cl)2] [38051-10-4] 10, and sodium silicofluoride [16893-85-9] 15 parts. A fine pore nonflammable foam with d. 50 kg/m3 was obtained. A similar foam contg. carbon black was elec. conductive. .

Corrosion of concrete in structures of cryolite plants

Corrosion of concrete in structures of cryolite plants. Shpynova, L. G.; Feklin, V. I.; Tuzyak, V. E.; Mel'nik, S. K.; Stepanova, V. I. (L'vov. Politekh. Inst., Lvov, USSR). Izv. Vyssh. Uchebn. Zaved., Stroit. Arkhit., (10), 83-8 (Russian) 1976. 7664-39-3 and 16925-39-6 which are cas registry numbers of chemicals are mentioned. CODEN: IVZSA8. DOCUMENT TYPE: Journal CA Section: 58 (Cement and Concrete Products) The corrosion of unreinforced and Fe-reinforced concretes was studied in building structures of the HF and cryolite [15096-52-3] industry. HF decomposes the Ca(OH)2 and Ca hydrosilicates with the formation of CaF2, CaSiF6 [16925-39-6], and Na2SiF6 [16893-85-9]. The formation of CaF2 is assocd. with a decrease and formation of CaSiF6 and Na2SiF6 assocd. with an increase in the vol. of the concrete. Both vol. increase and decrease result in formation of internal stresses, cracking, and rupture of the concrete. .