Can pieces composed of various elements or materials be treated?
When the piece to be treated is composed of various different elements joined together certain precautions must be taken, particularly if they are made of different materials. Different materials have different expansion coefficients and this means that, at cryogenic temperatures, very significant tensions can be created. The materials are usually more fragile when the temperature drops and, therefore, these tensions could lead to breakages (special care with plastic elements). Whenever possible, it is recommended to dissemble or loosen the joints under tension. If in doubt, it would be recommendable to carry out a previous test to ensure there are no problems. Special care must be taken when there are elements glued with precision as practically no adhesives maintain their performance at cryogenic temperatures. This may make the treatment unviable in some applications.
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