Adelaide's chemical plants utilize hammer union seals in chlorine liquefaction systems at -30°C, employing low-temp HNBR with glass microballoon fillers for cryogenic flexibility. These seals maintain 95% compression set resistance after 70-hour immersion in 38% HCl. Compliant with AS 4041 pressure piping codes, they feature radiused corners preventing stress risers. https://globalsealstech.com/product/hammer-union-seal-2/