https://defseals.en.made-in-china.com/product-group/kqpQaOdwZrWf/Back-up-Rings-catalog-1.html
Back-up Rings - Guangdong DEF Seals Solutions Co., Ltd. - page 1.
China Back-up Rings catalog of Premium High Performance PTFE Seals Ring for Industrial Applications, Made in China Hydraulic Fixed PTFE Gaskets High Quality...
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https://ltu.diva-portal.org/smash/record.jsf?pid=diva2:997247
The influence of back-up rings on the hydrodynamic behaviour of hydaulic cylinder seals
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