Formulae and Tables - Wood / textbooks for vocational training (GTZ, 122 p.) 4. Glass Materials (introduction...) 4.1. Classification of Glass Materials 4.2. Properties of Glass Materials 4.3. Applications of Glass Materials

Formulae and Tables - Wood / textbooks for vocational training (GTZ, 122 p.)

4. Glass Materials

Glass is a transparent, isotropic *) inorganic material.

*) showing the same physical properties in all directions of space

4.1. Classification of Glass Materials

Classification aspect	Glass grade	Remarks
flat glass	sheet glass	as thin, window and thick glass
	flat glasses with special effects, refined flat glass products	ribbed glass, antique glass, opal glass, frosted glass, plate glass, safety glass, thermoglass panes
fibre-glass materials	glas fibres	coarse glass fibres, textile fibres made of glass
	glass silk	superfine glass fibres

4.2. Properties of Glass Materials

Property	Sheet glass	Glass fibres
density r in g · cm-3	2.4...2.6	2.5
compressive strength ddB in MPa	800...1000
tensile strength dzB in MPa	70...90	850...4000 according to the thickness
bending strength dbB in MPa	50...150	170...3400 according to the thickness
temperature stability in °C	£ 500	-50...+300-C

Dimensions of sheet glass

Glass grade	thickness in mm	width in mm	length in mm
thin glass	0.9...1.6	300...700	1200...1400
window glass	2.0...4.0	300...1800	1000...2000
thick glass	4.5...5.5	400...2010	1050...2550

Dimensions of furniture glass

Glass element	thickness in mm	width in mm	length in mm
sliding doors	3.0...6.0	80...1200	100...1600
revolving doors	5.0...6.0	80...1200	100...1600
panels	3.0...6.0	80...1200	100...1600
glass tops	3.0...5.5	80...1200	100...1600
insertable plates	3.0...7.5	80...600	100...1600

4.3. Applications of Glass Materials

Material	Application	Remarks
thin glass	picture glass
window glass	glazing in housing construction and social buildings, furniture, glass-houses, stables etc.
thick glass	shop windows, shop fittings, furniture making
ribbed glass	shop building, interior work, kitchen furniture etc.	shaping is made during the drawing process
antique glass	interior work, period furniture	old glass is imitated by inclusions, staining and similar
opal glass	hospital windows, office partition walls and similar	toughened or etched panes
frosted glass	shop building, interior work, furniture	an opal glass from the frosted side of which flat splinters are torn out
plate glass	mirrors in flates and social buildings, vehicle construction, furniture making etc.	flat glass covered on one side with a silver layer of ³ 70 nm thickness; the silver layer is provided with protective layers
safety glass	skylights, glass-roofed courts, roof parts, doors, all-glass walls etc.	as wired glass (rolled in wire cloth), one-layer and multilayer safety glass and compound glass (flat glass panes bonded with transparent foil)
thermoglass panes	housing construction and social buildings	two window glass panes hermetically joined together enclose a space filled with dry air, which prevents misting up of the panes at outdoor temperatures down to -15 °C
glass fibres	building industry, machine building, textile industry	for heat and sound insulation, for reinforcement of plastic building materials
glass silk	structural elements, vehicle construction	processing with, for example, polyester resins into high-strength materials