Wallace Instruments

The Wallace O14 Ageing Chamber reliably ages rubber samples in accordance with international standards, as an integral part of determining the Plasticity Retention Index (PRI) of raw natural rubbers. The PRI is a measure of the resistance of natural rubber to thermal oxidation (P0) on a non-aged specimen, followed by a test (P30) of a specimen that has been aged for 30 minutes at a temperature of 140° C ± 0.5°C. The Wallace O14 Ageing Chamber, in conjunction with the Wallace Plastimeter (P14), high efficiency cutter (WAS2) and traceability fixture, ensures maximum productivity when determining the PRI of natural rubber. Wallace supplies the O14 Ageing Chamber in two models with a capacity to age 48 or 96 samples respectively. Determining the PRI of rubber requires the accurate matching of the aged and non-aged rubber samples when performing the plasticity test. Wallace has designed a stackable traceability fixture which not only allows for accurate matching of the samples, but also ease of handling of samples between sample preparation, ageing and plasticity testing. Matching is achieved by coloured buttons in the tray handle and fixture tray.