Rotorless Rheometer

The Rotorless Rheometer is a rubber cure-testing instrument that applies controlled oscillatory shear to a compound inside a heated die cavity and records torque as vulcanization progresses. It is used in rubber formulation, incoming-compound evaluation, batch release, process development, extrusion research, and production quality control for tires, seals, hoses, cables, molded rubber, and other vulcanized products.

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Product Introduction

Product Overview

Key Advantages

Sealed Rotorless Cavity for Repeatable Cure Response

The rubber specimen remains enclosed between the heated dies while oscillatory shear is applied without a rotating rotor inside the compound. When the material softens, expands, or begins crosslinking, the fixed test geometry limits specimen movement and produces a cleaner torque response across repeated batches.

Thermal Stability for Scorch and Optimum-Cure Comparisons

Temperature control from ambient to 200°C, 0.01°C resolution, and fluctuation within ±0.2°C keep the die condition stable near scorch onset and t90. Small shifts caused by formulation or mixing changes can be separated from changes introduced by the heating system.

Automatic Torque Ranging with Complete Cure Parameters

The instrument switches among 0–5, 0–10, and 0–20 N·m ranges and records ML, MH, scorch values, cure time, cure rate, and t90. Single or overlaid curves reveal changes in compound viscosity, crosslink development, and plateau behavior without manual recalculation.

Customization Capabilities

Oscillation angle, torque range, cure time, temperature setpoint, and result definitions can be configured for the compound and test procedure. Test programs can be prepared for ASTM D5289, ISO 6502, GB/T 16584, HG/T methods, or internal formula-control limits.

The software database, curve-overlay layout, report fields, printer content, interface language, user permissions, and export format can be adapted to the laboratory. Electrical supply, compressed-air connection, enclosure details, and identification labels can also be prepared for the installation site.

Quality Control

Die closure, cavity sealing, heater response, test-zone temperature, torque zero, and torque span are checked during assembly. Oscillation angle and frequency are verified so that the specimen receives the programmed shear condition throughout the cure cycle.

A reference compound is tested to review curve repeatability, ML and MH response, scorch points, t90, temperature trace, and printed results. Air-pressure interlocks, die opening, safety functions, database storage, and final packing inspection are completed before release.

Technical Parameters

Item	Parameter
Standards	GB/T16584, ISO 6502
Die Cavity Type	Fully sealed
Temperature Range	Room temperature to 200°C
Temperature Fluctuation	≤ ±0.2°C
Temperature Display Resolution	0.01°C
Torque Range	0–20 N·m
Torque Display Accuracy	0.001 N·m
Power Supply	50 Hz, 220V ±10%
Compressed Air	≥ 0.40 MPa
Oscillation Frequency	100 cpm (1.7 Hz)
Oscillation Angle	±0.5°, ±1°
Torque Measuring Range	Automatic switching: 0–5 N·m / 0–10 N·m / 0–20 N·m
Ambient Temperature	0–35°C
Relative Humidity	<80%
Curing Time Range	2–300 min; t90 from 10 seconds to 5 hours
Print Content	Date, time, temperature, cure curve, temperature curve, ML, MH, ts1, ts2, t10, t90, Vc1, Vc2
Dimensions	600 × 700 × 1250 mm