The allowable stress for a quartz tube depends on its design tensile strength and the recommended design stress.
According to the references provided, the design tensile strength for fused quartz with good surface quality is in excess of 4.8 x 10^7 Pa (7,000 psi). However, in practice, a design stress of 0.68 x 10^7 Pa (1,000 psi) is generally recommended. This means that the quartz tube can withstand a stress of up to 0.68 x 10^7 Pa (1,000 psi) without experiencing failure or deformation.
In addition to the stress considerations, it is important to note that quartz tubes have other characteristics that make them suitable for certain applications. For example, transparent quartz tubes can withstand temperatures up to 1100 degrees Celsius and have a very low coefficient of thermal expansion, making them resistant to thermal shock. They also have excellent electrical strength and stability under temperature variations.
Furthermore, when using a quartz tube in a tubular furnace or microwave tube furnace, there are specific guidelines to follow. The softening point of the quartz tube is 1270 degrees Celsius, and it is recommended to not exceed 3 hours of use at 1200 degrees Celsius. It is also important to keep the furnace tube clean and free from substances that react with SiO2. When heating, a ceramic plug should be placed in the furnace tube to distribute the temperature evenly and prevent damage to the O-ring in the flange.
Overall, the allowable stress for a quartz tube depends on its design tensile strength and the recommended design stress, but it is also important to consider other factors such as temperature limitations and proper maintenance during use in specific furnace applications.
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