Jointas Chemical is a leading sealant and industrial coatings manufacturer based in Guangzhou, China. Antas® is their sealant brand which has gained remarkable reputation since its introduction in 1989. China Construction Metal Structure Association has ranked Antas® among the best construction sealant brands for 14 consecutive years. Started as a private company, Jointas is now publicly listed in Shenzhen Stock Exchange – one of the few companies listed in the main stock exchange market out of the hundreds of sealant manufacturers in China.


Antas® sealants are manufactured from the factory located in Pearl Industrial Park in the outskirts of Guangzhou. Utilising 4 fully automatic sealant production lines in the manufacturing site of 82,000sqm, the production capacity of sealants is up to 100,000mt per annum. The sealant production lines include purpose built fully automatic colouring equipment. The state of the art facilities enable consistency, efficiency, low energy consumption and environmental sustainability.


Antas values its product quality and performance. ISO9001, ISO14001 and IATF 16949 quality systems are fully implemented by the company. The Jointas Testing Centre has been upgraded to CNAS standard and been following CNAS requirement for testings since 2018. The Centre officially became a CNAS accredited testing laboratory since 2020.

CNAS – China National Accreditation Service for Conformity Assessment – is the accreditation body member of International Laboratory Accreditation Cooperation (ILAC), International Accreditation Forum (IAF) and Asia Pacific Accreditation Cooperation (APAC).