GuanCe GCFT-1000C Powder Shear Tester

Overview

The GuanCe GCFT-1000C Powder Shear Tester is a benchtop shear cell-based instrument engineered for the quantitative characterization of powder flow behavior under controlled normal stress and shear stress conditions. It operates on the fundamental principles of Jenike shear testing—applying incremental normal loads to a consolidated powder sample in a cylindrical shear cell, then measuring the resulting yield locus via controlled rotational or translational shear. This methodology enables derivation of critical rheological parameters including unconfined yield strength (fc), major principal stress (σ₁), internal friction angle (φ), and flow function coefficient (FFC), which collectively define the powder’s flowability classification (e.g., “free-flowing”, “cohesive”, or “very cohesive”) per ASTM D6393 and ISO/CD 17892-12. Unlike simple angle-of-repose or funnel-flow testers, the GCFT-1000C delivers quantitatively traceable, stress-dependent flow data essential for hopper design, silo discharge analysis, and process scale-up in pharmaceutical, chemical, food, and battery material manufacturing.

Key Features

• Stainless-steel shear cell assembly with precision-machined surfaces (Ra ≤ 0.8 µm) to minimize wall friction artifacts and ensure repeatability across test cycles.
• Motor-driven shear head with programmable torque control and real-time shear stress feedback, enabling consistent shearing velocity (0.1–1.0 mm/s) per ASTM D6393 Annex A2.
• Digital timer module with ±0.1 s resolution and automatic tap-count tracking for synchronized振实 density (tap density) measurement per GB/T 31057.2–2018 and USP .
• Modular sample chamber accommodating standard 100 mL and 250 mL volumes—compatible with both free-flowing granules and highly cohesive fine powders (d₅₀ down to 1 µm).
• Electrostatically coated steel enclosure (RAL 7035 finish) providing corrosion resistance and mechanical stability in QC lab environments.
• Integrated calibration verification routine using certified reference powders (e.g., silica gel, lactose monohydrate) aligned with ISO/IEC 17025 metrological traceability requirements.

Sample Compatibility & Compliance

The GCFT-1000C supports a broad spectrum of dry particulate systems: pharmaceutical actives and excipients (e.g., microcrystalline cellulose, mannitol), metal powders (Fe, Al, Ti alloys per GB/T 5162–2021), ceramic precursors, catalysts, and battery electrode materials (NMC, LFP). Its test protocol conforms to multiple international standards governing bulk solids characterization—including GB/T 31057.2–2018 (tap density), GB/T 31057.3–2018 (flow index), ASTM D6393–2014 (Carr indices: compressibility, Hausner ratio, angle of repose), and pharmacopeial methods (USP , EP 20934). All mechanical and electrical components meet CE safety directives (2014/30/EU EMC, 2014/35/EU LVD), and operational documentation supports GLP-compliant audit trails when paired with external lab information management systems (LIMS).

Software & Data Management

While the GCFT-1000C operates as a standalone hardware platform with front-panel digital display and manual data recording, it is fully compatible with third-party spreadsheet and statistical analysis tools (e.g., Excel, JMP, Python pandas). Raw outputs include normal stress (kPa), shear stress (kPa), consolidation time (s), tap count, and derived indices (Hausner ratio, compressibility %, flow function). For regulated environments, users may integrate instrument logs into validated LIMS or ELN platforms supporting 21 CFR Part 11 compliance—requiring electronic signatures, audit trail generation, and user access controls. GuanCe provides standardized test report templates (PDF/CSV) aligned with ISO 10012 and ASTM E2500 validation guidance.

Applications

• Design and validation of gravity-fed hoppers, feeders, and pneumatic conveying lines based on measured flow function curves.
• Batch-to-batch consistency monitoring of API blends during pharmaceutical solid-dosage manufacturing.
• Evaluation of anti-caking agent efficacy in food powders (e.g., milk powder, spices) under variable humidity preconditioning.
• Correlation of shear-derived cohesion values with particle surface energy measurements (e.g., inverse gas chromatography).
• Supporting QbD (Quality by Design) initiatives per ICH Q8(R2) through mechanistic understanding of powder rheology–process performance relationships.
• Academic research in granular physics, including stress relaxation, time-dependent consolidation, and strain-rate effects on yield loci.

FAQ

What standards does the GCFT-1000C directly support for regulatory submissions?

It implements test procedures referenced in USP , EP 20934, and ASTM D6393–2014—enabling generation of data suitable for FDA, EMA, and NMPA regulatory filings when executed within a validated method framework.
Can the instrument measure dynamic powder flow properties such as aeration or fluidization?

No—the GCFT-1000C is a quasi-static shear tester optimized for consolidated-state flow characterization. Dynamic flow assessment requires complementary instrumentation (e.g., FT4 Powder Rheometer or Schulze Ring Shear Tester with air-permeable pistons).
Is calibration certification included with shipment?

Yes—each unit ships with a factory calibration certificate referencing traceable standards for torque, timing, and displacement. Optional UKAS-accredited calibration services are available upon request.
What maintenance is required for long-term accuracy?

Annual verification of shear cell parallelism, load cell linearity, and timer synchronization is recommended. Stainless-steel components require only periodic cleaning with ethanol; no lubrication is needed.
Does the system support automated data export to LIMS?

The GCFT-1000C has no built-in USB/RS232 interface; however, its analog output signals (0–10 V) for torque and time can be interfaced with industrial DAQ systems for automated logging and LIMS integration.