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The expansion method of rubber O-ring can refer to the following steps:

Place the rubber O-ring in hot water and heat it to an appropriate temperature to soften and expand.

Use your hands or tools to expand the softened rubber O-ring to the required size.

Wait until the rubber O-ring cools down, remove and use it.

It should be noted that heated and expanded rubber O-rings may affect their performance and service life, and should be used with caution. At the same time, the expansion rate of rubber O-rings is also influenced by factors such as their material, formula, and vulcanization process. Different rubber materials have different expansion rates, so these factors need to be taken into account when using them.