Shoe heat insulation testing machine -- sand bath

The sand bath component of the shoe heat insulation testing machine is primarily used to test the heat insulation or thermal insulation performance of footwear in a high-temperature sand and gravel thermal medium.

Applications

Shoe heat insulation testing machine - sand bath: This machine is primarily used to test the high-temperature resistance of sole materials such as rubber and polymers used in welding protective shoes and high-temperature shoes. After testing, the surface of the outsole sample should not show any softening, melting, or cracking. The test method involves heating the sand bath to 150℃, covering the contact area between the shoe upper and sole with sand, and recording the change in insole temperature over 30 minutes, with an accuracy of 0.5℃.

Standards

GB/T 20991: Determines thermal insulation of safety shoe soles under simulated hot surface exposure.

EN ISO 20344: European standard for personal protective equipment (PPE) footwear thermal resistance testing.

Features

Sand Bath System:

Heated Plate: 300mm × 300mm aluminum plate with 50mm silica sand layer.

Uniform Heating: Embedded cartridge heaters with thermal diffusers.

Temperature Control:

PID controller with auto-tuning for rapid setpoint convergence.

Over-temperature alarm with 5°C differential protection.

Sensing Suite:

2 × K-type thermocouples for sand bath and shoe interior.

1.5m cable length for flexible probe placement.

Safety Systems:

Category II electrical safety certification (EN 60529).

Residual current device (RCD) for operator protection.

Software Bundle:

ThermShoe Pro™: Auto-calculates thermal gradient (°C/min) and insulation index.

Cloud PPE: Remote monitoring for global R&D teams.

Technical Parameters

Accessoriess

Standard Kit:

100 × 50g calibration steel balls (316L stainless).

2 × K-type thermocouples with color-coded connectors.

Software Add-Ons:

Batch Processor: Queue 24/7 unattended testing.

API Integration: Connect to MATLAB/Python for custom analytics.

Safety Upgrades:

Explosion-proof enclosure for volatile environments.

HEPA filtration for particle-sensitive labs.

Calibration Services:

Annual recalibration with NIST-traceable certificate.

Consumables:

10L Replacement silica sand (high-purity, 0.5–1mm grain).

1L Thermal paste for sensor calibration.

Test Procedures

Calibration Procedure:

Calibration Item: Temperature

Calibration Instrument: Surface Thermometer

Calibration Period: One year

Calibration Method:

1. Turn on the power switch and set any test temperature on the temperature controller (e.g., 40℃, 60℃, 80℃).

2. Place the surface thermometer's sensing probe on the machine's heating plate and turn on the surface thermometer's power switch to allow the machine to heat up.

3. When the test machine (i.e., the displayed value of the temperature controller) reaches the set test temperature, observe the difference between the displayed value of the surface thermometer and the displayed value of the temperature controller.