Wallace Rapid Plastimeter Mk V - P14

Purpose

The Wallace Rapid Plastimeter measures the plasticity or viscosity of unvulcanised rubbers. The test is simple, clean and quick. The instrument is used in conjunction with the Wallace Ageing Chamber (Cat. Ref. O14) to determine the Plasticity Retention Index (PRI) of raw natural rubbers.

The variable temperature model (P14/VT) characterises the flow behaviour of synthetic rubber compounds as, its platen temperatures can be varied between 50°C and 180°C. For some applications the P14/VT offers a quick, low cost alternative to a Mooney Viscosity test.

The instrument is supplied in 2 models and each model comes complete with a Specimen Cutter. The instrument is shipped with 10mm dia top platen installed and alternative top platens of 7.3 and 14mm diameter are supplied as accessories. The platens are easily interchangeable.

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Principle

A modified parallel plate compression principle is used with automatically timed "conditioning" and "load" periods. A sample is compressed between two circular platens which are maintained at a temperature of 100°C. The sample is conditioned for 15 seconds at a thickness of 1mm. A compressive force of 100N is then applied for 15 secs. The final thickness of the test piece expressed in units of 0.01mm, is the plasticity number.

Test Procedure

The sample is prepared using the specimen cutter provided and it is then enclosed between two pieces of tissue paper, as defined by international standards, before being placed between the platens. The tissue paper prevents the material sticking to the platens or sliding between them.

The automatic test sequence is started when the operating handle is rotated.

The reduction in thickness of the sample is displayed digitally, which freezes, to show the plasticity number at the end of 15 seconds.

Features

The P14 Rapid Plastimeter offers greatly enhanced operator access and is available in two models. A feature on both models is powered zero calibration eliminating the need for tedious manual setting. Aluminium castings are used throughout the design for rigidity and stability. Both models comply with National and International standards.

Rapid Plastimeter - P14-001

• Fully automatic operation
• Accurate amd repeatable results
• Built in diagnostics
• LED platen Temperature Indicator
• PC Interface (RS 232) for data caputre to PC

Rapid Plastimeter - P14/VT

• Same specification as the P14-001, plus:
• Variable platen temperature 50°C - 180°C

General

The Plastimeter can be supplied to operate on any normal single phase AC electricity supply.
Two sizes of upper platen anvils are supplied: 7.3 mm and 14 mm diameter. These permit the instrument to operate satisfactorily over a wide plasticity range. The lower platen is suitable for all sizes. Changing the upper platen is a simple operation taking only a few minutes.

Specifications

Plasticity Retention Index (PRI)

PRI is a measure of the resistance of raw natural rubber to oxidation. The oxidation effect is assessed by measuring the plasticity before ageing (P0) and after ageing for 30mins in the Wallace - MRPRA ageing oven at 140°C (P30)