Product Overview
The Raw Sand Specific Surface Area Tester (QR-SMT) is a precision instrument designed to measure the specific surface area (SSA) and porosity of silicon sand used in casting. Specific surface area refers to
the total surface area per unit mass of material, expressed in m²/g, and is an important factor in evaluating the properties of raw
and reclaimed sand.
The instrument adopts the ventilation method: it measures the time required for air to pass through a defined
sand column, and then calculates the actual specific surface area
using the national standard formula. The QR-SMT fully complies with
GB/T 9442-1998 “Silicon Sand for Casting” and Appendix B “Method for Determining the Angular Factor of
Silicon Sand for Casting.”
With its infrared sensor system, SM high-precision timer, and fully
automated control, the QR-SMT ensures high sensitivity, excellent anti-interference
performance, and reliable repeatability. A single press of the
start button completes the entire measurement process, making it
efficient, accurate, and user-friendly.
Working Principle
The test procedure begins by preparing a 50g (±0.01g) sand sample
after removing mud and drying. The sand is placed in a calibrated
glass test tube and gently compacted until stable volume is
reached. The instrument seals the sample tube, and after the start command, air is passed through the sand column.
The infrared sensors (K1, K2, K3) detect liquid level changes, and the system records the
ventilation time automatically. After five consecutive tests, the
highest and lowest values are discarded, and the average time is
used for calculation. The measured time is then substituted into
the standard formula to determine the actual specific surface area (SSA) of the sand sample.
Technical Specifications
| Parameter | Specification |
|---|
| Measurement range | 0.001 – 0.1 m²/g |
| Timing range | 0 – 99.9s |
| Power supply | AC 220V ±10%, 50Hz |
| Pipeline sealing | Liquid level drop ≤ 5mm within 10 minutes |
| Repeatability | Difference between max & min (10 tests) ≤ 0.5s |
Key Features
Complies with National Standards
High-Precision Timing System
Infrared Sensor Technology
Fully Automated Operation
Reliable Repeatability
Applications
The QR-SMT Specific Surface Area Tester is widely applied in:
Foundry and Casting Industry – for evaluating raw and reclaimed sand quality.
Material Inspection Laboratories – for porosity and surface area testing.
Research Institutions & Universities – as a teaching and research tool for material property analysis.
Quality Control Departments – providing reliable data for process optimization and sand
selection.
✅ Why Choose the QR-SMT?
Fully automated measurement with simple operation.
Accurate results with excellent repeatability.
Infrared detection system ensures sensitivity and stability.
Standard-compliant testing method for reliable data.
Suitable for industrial production, inspection, and research
applications.
