ISO 48-8 is the ISO standard that specifies a method for determining the apparent hardness of vulcanized or thermoplastic rubber roller covers, expressed as the Pusey and Jones indentation value. The current edition is ISO 48-8:2018, which replaced ISO 7267-3 and was confirmed by ISO in its last review.
A Pusey and Jones plastometer measures how deep an indentor goes into the rubber surface under a specified force. The value is not the same as the international rubber hardness reading of ISO 48-2, because the rubber right next to the indentor is precompressed. It is also an inverse measure: the harder the rubber, the lower the Pusey and Jones value. Roller manufacturers and roller users cite it when specifying and checking roller covers.
Plastometers such as our Pusey and Jones tester are used for testing roller covers to ISO 48-8. If you need help matching ISO 48-8 requirements to your parts or setup, contact our team.
