SU990700A1 - Glass for chemical laboratory glassware - Google Patents

Description

(54) GLASS FOR CHEMICAL AND LABORATORY

PRODUCTS

  1 The invention of fire protection to the glass industry, in particular to the production of thin-walled chemical products, can be used in factories for their manufacture. Known glass composition for the manufacture of NIN chemical laboratory products, containing, wt.%: Si02 71.5-73.5; 1.8-3.2; CaO 6-7; NOgO 13.5-14.5 MofO 2-3; O, 8-2.2 and Se 0.30, 5.. This glass has good cooking and working properties, having a sufficiently high chemical resistance to the action of water and hydrochloric acid solutions tl. The disadvantage of this glass is its low stability when processing on a glass-blowing burner. In addition, its cooking requires extremely scarce and very expensive raw materials - boric acid and selenium. All this greatly increases the cost of production of finished products and increases the yield of marriage. Closest to the invention, is a glass composition for laboratories containing, in wt%, SiQ 60-75; LKZOz 3-1O-, CaO + MS 6-15; t2-l8; KjO 0-5 and BaD. The disadvantages of the known composition are the high content of CaO, which leads to a decrease in resistance in the soybean and the stability of the glass-blowing burner. The purpose of this process is to increase the resistance to hydrochloric acid and its stability when processed on a glass-blowing burner. The goal is achieved by the fact that glass for laboratory chemical products, including, SHO, Mc, N 2 and KjO, contains F 1 fi the following ratio of components, wt.%: StOj 70.2-70.7 / (20з 3, О -3.4 2.2-2.6 7.0-7.5 2.1-2.5 13,, 3 0.7-1.2 0.2-O, 25 Q as kfeshgff use for warn glass They are both reactive and refXHH sfievye materials. All of them, especially technical, except the main thing contain impurities, therefore,

1 temperature glass melting, ° C

The temperature of the upper limit of crystallization, ° C

Linear ratio of cpfeni. Yutermichesky firmness,

with

Weight loss percentage

heated in water at 98 ° C for 3 h

heating in 20, 24% hydrochloric acid solution at 98 ° C for 3 h

heating in a mixture of equal volumes I n. solutions of sodium carbonate and sodium hydroxide at 98 lac for

3 h 99O7 5

Tablipa I

145O

145O

1450

1.67

1.68

Claims (2)

1.64 004, the charge is made taking into account the content of the main substance in SF, the brewing of glasses in a glass-melting furnace when boiled at this temperature for 2 hours; After the process; the products are carefully burned, the quality of the roasting control the floor at risk. Prtery stetsla compositions are given in Table. I. In table. 2 shows their properties. The proposed compositions of glasses are more stable when processed on a glass-blowing burner, their use will significantly reduce the yield of scrap when processed on a burner. The implementation of the invention will significantly reduce the cost of production, reduce the consumption of very definitive raw materials, reduce waste and improve the quality of products. Claims of the invention: Glass for chemical laboratory products, including SlOj, GaO, Mt, N "20 and KjO, o t h And ya e with the fact that, in order to improve resistance to hydrochloric acid and sustainability. Continued tab. 2, when processed on a glass-blowing burner, it additionally contains F. With the following ratio of ESHI components, in wt.%: 502,02.2-70.7 AESO3 3.0-3.4 M ($ 02.2-2.6 CaO7.0 -7.5 ВаО2.1-2.5 NdjO 13,, 3 М0.7-1.2 F0,2-О, 25 Sources of information taken into account during the examination 1, Copyright s.SSSR fe 392O15, class С OZ С 3/04, 1971. 2. US patent M 3330638, kl.65-134, 1967.