KR-133 Dynamic Compression Heat Build-Up & Fatigue Flexometer (ASTM-D623)

Additional information

30 ~ 85 IRHD Vulcanized Rubber Flexometer Compression Heat Tester

This machine is used to test the compression heat generation and fatigue of vulcanized rubber with a hardness of less than 85 IRHD. It’s utilized for flexural testing (Heat Generation test) and fatigue testing in tensile, compression and shear modes to determine the heat generation on the surface and inside of the sample.

The machine applies a certain compression load to the specimen through an inert lever system, and a periodic high-frequency compression with a specified amplitude to the specimen through a transmission system to determine the compression fatigue temperature rise and fatigue life of the specimen in a certain period of time at room temperature or higher than room temperature.

 

By applying a specified compression load to the specimen and compressing the specimen periodically with a certain amplitude and frequency, the compression fatigue temperature rise, static compression deformation rate, dynamic compression deformation rate, permanent deformation, and fatigue life of the specimen within a certain period of time are measured.

Product Details:

Rubber Compression Heat Generation Flexometer

Product Introduction

The KR-133 compression flexometer is professional testing equipment engineered to evaluate heat accumulation and fatigue failure performance of vulcanized rubber materials ranging from 30 to 85 IRHD hardness. It fully complies with ASTM D623 and ISO 4666-3 international standards, simulating the continuous cyclic compression loads that rubber goods like tires, sealing gaskets and shock pads endure during real-world operation.
Through servo-controlled periodic reciprocating compression with fixed static preload, the instrument continuously tracks core metrics including internal temperature rise, dynamic/static compression deformation, permanent set and fatigue failure lifespan. It delivers objective comparative data for rubber formula optimization, raw material incoming inspection and finished product durability verification, widely adopted by tire factories, auto component manufacturers, polymer R&D labs and third-party accredited testing institutes.

Core Equipment Advantages

  1. Servo Closed-Loop Loading & Precise Force Control

    Equipped high-precision load cell paired with servo drive system, realizing automatic stepless pre-stress loading at 1.00MPa or 2.00MPa with control tolerance within ±0.03MPa / ±0.06MPa. Unlike traditional counterweight balance structures, electronic load adjustment delivers faster setup and consistent long-term pressure output without drift.

  2. Independent Constant-Temperature Test Chamber

    Insulated multi-layer heating cavity design delivers stable ambient temperature ranging from room temperature +10℃ up to 120℃, with temperature fluctuation strictly limited to ±1℃. Rapid heat recovery after door opening minimizes test environment interference, supporting high-temperature aging flex test conditions as required by global standards.

  3. Multi-Channel Synchronous Temperature Acquisition

    Two groups of high-sensitivity temperature probes independently monitor surface temperature and core internal temperature of the specimen, measuring thermal buildup caused by rubber hysteresis loss under dynamic cycling. Data is captured at millisecond intervals to draw complete real-time temperature change curves throughout the full test cycle.

  4. Adjustable Compression Stroke & Frequency

    Flexible parameter configuration covers oscillation frequency from 10Hz to 30Hz and compression stroke between 1.00–8.00mm, with three standard fixed strokes (4.45mm / 5.71mm / 6.35mm preset for standard compliance). The low-vibration crank transmission structure ensures stable, quiet high-speed reciprocation with frequency deviation controlled under ±0.2Hz.

  5. Windows Intelligent Data Acquisition Software

    Dedicated bilingual (Chinese/English test software operates under Windows systems, featuring visualized real-time curves for temperature, deformation and cycle counts. The system auto-saves full test records, supports one-click report generation with customizable report templates, and retains all historical test data for traceability and comparative analysis.

  6. Complete Safety Protection System

    Front mechanical safety interlock, emergency stop button and over-temperature auto-cutoff function. The enclosed test chamber prevents accidental contact with moving compression components during high-frequency operation, fully meeting laboratory equipment safety specifications.

Parameters:

Model KR-133
Chamber Temperature RT+10℃~120℃
Chamber Temperature accuracy ±1.0℃
Chamber size(W×D×H) 130mm×100mm×230mm
Force capacity 5KN
Specimen low sensing temperature range RT~260℃
Temperature deviation ±1.0℃
Sensing temperature range at the center of the specimen RT~260℃
Temperature deviation ±1.0℃
Specimen oscillation frequency range 10.0Hz~30.0Hz (Optional Settings)
Frequency deviation of specimen ≤±0.2Hz
Compression stroke range 1.00mm~8.00mm (Manual Adjustment)
Compression Stroke Value 4.45mm、5.71mm、6.35mm
Specimen Prestress 1.00MPa±0.03MPa、2.00MPa±0.06MPa
Specimen pre-stress loading method Motor-driven load cell sensing method
Specimen specifications Ø17.80±0.15mm;Height:25.00±0.25mm
Specimen base up/down travel 0.1mm~18.00mm
Specimen base up/down speed 5mm/min
Controller U70
Communication Type RJ45
Software Flexometer
Machine size(W×D×H) 68cm×96cm×125cm
Weight(about) Host(450kg);Control box(90kg)
Power 1∮, AC 220V, 50HZ (Country-specific or designated)

 

 

 

Rubber Compression Heat Generation Flexometer

Standard Test Operation Flow

  1. Specimen Pre-ConditioningCut raw rubber into standard cylindrical specimens, store under standard lab temperature & humidity environment for sufficient conditioning to eliminate internal stress before testing.
  2. Equipment Parameter SetupLaunch supporting test software, set target chamber temperature, oscillation frequency, compression stroke, preload pressure and total test duration according to test standards or research requirements.
  3. Specimen InstallationOpen insulated chamber door, place standardized specimen between upper and lower compression platens, close the safety door to activate interlock protection.
  4. Preload Compression CalibrationStart servo preloading program, the system automatically applies preset static compressive stress on the sample and holds stable pressure.
  5. Dynamic Cyclic Flex TestInitiate high-frequency reciprocating compression cycle; the system continuously records specimen core temperature, surface temperature, dynamic deformation and cycle numbers in real time.
  6. Data Export & Report GenerationUpon completion of the set test duration, the machine automatically halts oscillation. Users can export raw data curves and generate standardized test reports directly within the software.

Applicable Materials & Industrial Fields

Tire Manufacturing Industry

Tread rubber, sidewall compound, bead filler rubber; test heat generation and anti-fatigue performance under rolling dynamic load to evaluate tire durability and anti-blowout performance.

Automotive Sealing Parts

EPDM, NBR, FKM gaskets, suspension shock-absorbing rubber, engine buffer pads; verify long-term dynamic compression heat accumulation and permanent deformation.

Conveyor Belt & V-Belt Factories

Rubber belt core materials, transmission belt compound; compare hysteresis loss and heat buildup of different formula blends.

R&D & Third-Party Testing Labs

New rubber formulation screening, aging resistance research, batch finished product quality certification to meet ISO/ASTM international compliance standards.

Compliant Global Test Standards

  1. ASTM D623-07(2019): Standard Test Methods for Rubber Heat Generation & Flex Fatigue Under Compression
  2. ISO 4666-3:2017 Vulcanized Rubber – Flexometer Test for Temperature Rise & Fatigue Resistance (Constant Strain Compression Type)

Standard Delivery Package

  1. KR-133 main compression flexometer unit
  2. Matching industrial control desk with monitor, mouse & keyboard
  3. Standard alloy compression platens for Φ17.8mm specimens
  4. Dual temperature sensing probes (core + surface)
  5. Full set of operating software (Chinese & English bilingual version)
  6. Operation manual, calibration guide and factory inspection certificate
  7. Power cable and RJ45 communication wire

Global Technical & Distribution Support

We supply full remote operation training, parameter debugging guidance and long-term spare sensor/platen supply for overseas clients. Custom temperature range, frequency and stroke parameters are available upon request. Exclusive regional distributor cooperation policy offers priority production, OEM private labeling and complete marketing material support.

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KR-133 Dynamic Compression Heat Build-Up & Fatigue Flexometer (ASTM-D623)

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