SCHOTT North America

Chemical Properties

BOROFLOAT® ³³ consists of natural raw materials and is harmless to human beings and the environment. The glass can be recycled for further use.

BOROFLOAT^® 33 contains less than 190 coloring Fe₂O₃ ions and is consequently a clear and transparent colorless glass.

The chemical composition of BOROFLOAT^® 33 complies with the requirements for a typical borosilicate glass to DIN ISO 3585 and EN 1748 Pt. 1 respectively.

Like all borosilicate glasses BOROFLOAT^® 33 demonstrates a high resistance to water, many alkalis and acids as well as organic substances. Its chemical resistance is superior to that of most metals even in long-term use and at temperatures in excess of 100 °C (as used as sight glasses in the chemical industry). Exposure to water and acids only results in the leaching out of small amounts of ions from the glass (as used in medicine and analytical engineering).

		Class
Hydrolytic Resistance	to ISO 719 / DIN 12 111	HGB 1
	to ISO 720	HGA 1
Acid Resistance	to ISO 1776 / DIN 12 116	1
Alkali Resistance	to ISO 695 / DIN 52 322	A2

Tin Residue
The phenomenon of traces of tin on the surface is commonly known from the manufacture of regular soda-lime float glass. It is caused by an evaporation effect in the float bath atmosphere. These values are considerably lower for BOROFLOAT^® 33 than for soda-lime float glass on both the side in contact with the tin and on the other side which is exposed to the atmosphere. The reciprocal effect with coating is thus markedly less. It is recommended that the top side (labeled by the manufacturer) is used for coatings.

Chemical Properties of BOROFLOAT^® 33 diagrams:

Acid Attack on BOROFLOAT^® 33

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SCHOTT North America, Inc.

5530 Shepherdsville Road
Louisville, KY 40228
USA

+1 (502)6574417

+1 (502)9664976

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