glassware
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What is glassware?
Glassware refers to any decorative article made of glass, often designed for everyday use. Since ancient times, glass has been used to create various vessels, and across countries where the industry has developed, glass has been produced in many forms with varied decorations.
Traditional glass products, including tableware, containers, tubes, rods, flat glass, and fiberglass, are made via a melting process. Viscosity is a key property in glass forming. Commercial glasses are divided into soda-lime-silica glasses and special glasses.
The wide range of properties that glasses exhibit depends on their composition.
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What materials are used to make glassware?
Glassware is made from a variety of materials, depending on the intended use and desired properties of the glass.
The most common type of glass is soda-lime glass, which is composed of about 70% silica (silicon dioxide), 15% soda (sodium oxide), and 9% lime (calcium oxide), with small amounts of other compounds. Silica is often obtained from sand, soda from sodium carbonate or sodium hydroxide, and lime from limestone.
Other types of glass include:
* Silica glass: Made exclusively of silica, used when high service temperature, chemical durability, and thermal shock resistance are needed.
* Borosilicate glass: Used when high thermal shock resistance and chemical durability are desired.
* Lead crystal glass: Contains lead monoxide and has a high refractive index, resulting in sparkle and brilliance.3 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What are some common types of glassware?
Glassware refers to any decorative article comprised of glass, often designed for everyday use. Glassware has been produced in a variety of forms with different kinds of decoration. The history of glass as a creative art has been determined partly by technical advances in its manufacture and decoration and partly by the history of taste and fashion.
Common types of glassware include:
* Silica glass Used when high service temperature, very high thermal shock resistance, high chemical durability, very low electrical conductivity, and good ultraviolet transparency are desired.
* Soda-lime glass Used for products, such as containers, windows, and lightbulbs, where the primary criteria are low cost and good durability.
* Borosilicate glass Used where high thermal shock resistance and high chemical durability are desired, as in chemical glassware and automobile headlamps.
* Lead crystal Formerly used to make tableware, lead crystal contains high amounts of lead oxide, which gives the product a high refractive index and a high elastic modulus.4 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How is glassware made?
Glassware is made through a melting process where viscosity is key. Traditional glass products such as tableware, containers, tubes, and rods are formed this way.
First, raw materials are carefully weighed and selected. Then, after melting and conditioning, the glass is delivered to a forming machine at a viscosity of approximately 10^4 poise. At this point, the glass can be worked to form the desired object and then released in a near-solid condition. Throughout the process, heat is extracted in a controlled manner to allow the viscosity to increase from liquid levels to solid levels.
For example, tableware tumblers are made by blowing glass into a split paste-mold, giving the glass a smooth finish. Tubes and rods are made using the Danner, downdraw, and Vello processes. Finally, the newly formed glass undergoes annealing to reduce internal stresses.
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Why is glassware used in laboratories and kitchens?
Glassware is common in laboratories and kitchens due to its properties. It is transparent, hard, brittle, and impervious to natural elements.
In laboratories, borosilicate glass, containing at least five percent boron oxide, is often used for heat-resistant glassware.
Different types of glass have different compositions that give them unique properties, such as resistance to heat, chemicals, or electricity.
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How should glassware be cared for to avoid damage or accidents?
To properly care for glassware and prevent damage, remember that glass can be weakened by a number of factors. Avoid subjecting glassware to sudden temperature changes or alkaline environments, as this can cause cracking and deterioration.
Always handle glassware with care to prevent scratches and flaws, which can concentrate stress and lead to fractures. Regular, light cleaning can have an enormous advantage in long-term preservation. When repairing broken glassware, use low-viscosity, light-stable epoxies or other adhesives with a refractive index similar to glass.
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glassware, any decorative article made of glass, often designed for everyday use. From very early times glass has been used for various kinds of vessels, and in all countries where the industry has been developed glass has been produced in a great variety of forms and kinds of decoration, much of it of great beauty. For the composition and properties of glass and the manufacture of various glass products such as glass containers, window glass, plate glass, optical glass, and glass fibres, see industrial glass.
Antiquity and the Middle Ages
Early glass
It is not certain in which of the civilizations of the ancient Near East glass was first made. The earliest wholly glass objects from Egypt are beads dating from some time after c. 2500 bc. A green glass rod found at Eshnunna in Babylonia may go back earlier, possibly to 2600 bc. A small piece of blue glass found at Eridu dates from before 2200 bc. The manufacture of glass vessels, which may have begun slightly earlier in Mesopotamia, was carried to a high point of excellence in Egypt during the 18th dynasty (c. 1490 onwards). These vessels are distinguished by a peculiar technique: the shape required was first formed of clay (probably mixed with dung) fixed to a metal rod. On this core the body of the vessel was built up, usually of opaque blue glass, on which, in turn, were coiled threads of glass of contrasting colour. The threads were pulled alternately up and down by a comb-like instrument to form feather, zigzag, or arcade patterns (see ). The threads—usually yellow, white, or green in colour, and sometimes sealing-wax red—were rolled in (marvered) flush with the surface of the vessel. Finally, if desired, handles—often of translucent glass and sometimes of patterned “canes”—were added. The vessels were nearly always small, mainly for unguents and the like. Occasionally glass was decorated on the lapidary’s wheel. Glass is known to have been made on the palace site of Tell el-Amarna, the residence of Akhenaton (reigned c. 1379–62 bc), and the number of fragments found in and near the palace of Amenhotep III (reigned c. 1417–1379 bc) at Thebes suggests that it was made there also. This palace activity seems then to have died down and after the 21st dynasty (1085–945 bc) to have ceased altogether.
In Mesopotamia the Nineveh tablets of the reign of Ashurbanipal (668–c. 626 bc) and the remains of glass in various forms excavated at Nimrūd (ancient Calah, Assyria) indicate that glassmaking was carried on there during the 8th to the 6th centuries bc. It is probable that certain vessels of palish-green or deep blue glass, cut from a solid mass as if from stone, are Mesopotamian and date from as early as the 8th century bc, as a dish from controlled excavations in Phrygia proves. A vase of this type, contrasting completely with the core-wound glass of Egypt, bears the cartouche (panel enclosing the name) of the Assyrian king Sargon II (reigned 721–705 bc), and it is probable that glass treated in this way was manufactured over a long period in Mesopotamia.
Glass was made in Greece in Mycenaean times (c. 1400–1200 bc) usually in the form of small molded architectural details. A few pieces suggest, however, that perhaps some vessel glass also was made by the Egyptian technique, though not in Egyptian forms. Other Aegean-area glass of this period may have been imported from Egypt.
In general, glass of the earlier half of the 1st millennium bc is scarce and displays little homogeneity. From the 6th century bc, however, glass begins to appear in great quantities once again, particularly on the Greek-inhabited islands of the Aegean, in Greece itself, in Italy and Sicily, and even farther west. This contrasts with the meagre contemporary finds on Egyptian soil. The later glasses in the old Egyptian core-wound technique were probably made in Syria or some part of the Greek world. Such vessels were still small but differ in shape from the earlier Egyptian dynastic work. They were usually decorated with light-coloured threads on a dark, usually blue, ground (familiar from the Egyptian 18th dynasty), but a notable variation was displayed in pieces decorated with dark purple threads on a white ground. In the Hellenistic period (roughly from the 4th century bc) the shapes of glass degenerated. The technique of decoration, however, remained the same; new colour combinations were used, and indeed these combinations continued into the era of blown glass.

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