Mary Ann® SS-25 / SS-25F Rotary Sieve Shaker with Stackable Sieve Columns

Overview

The Mary Ann® SS-25 and SS-25F Rotary Sieve Shakers are precision-engineered laboratory instruments designed for standardized dry particle size distribution analysis in accordance with ASTM E11, ISO 3310-1, and USP . These units employ a dual-motion mechanism—controlled rotation combined with vertical tapping—at a fixed 45° sieve inclination angle. This motion profile optimizes particle stratification and promotes efficient passage through stacked test sieves without mechanical clamping. The absence of clamping hardware eliminates alignment variability and reduces setup time, supporting high-throughput quality control workflows in pharmaceutical, mineralogical, chemical, and construction materials laboratories. Both models feature a rigid cast aluminum housing with hardwood-finished exterior panels, ensuring long-term dimensional stability under repeated vibrational loading. The SS-25 operates on 115 V / 60 Hz power, while the SS-25F is configured for 220 V / 50 Hz international mains supply—enabling seamless integration into global GLP-compliant environments.

Key Features

• Dual-motion drive system: Synchronized rotation and tapping at 45° sieve tilt for reproducible particle segregation across broad size ranges
• Tool-free stack assembly: Accepts up to 26 in (660 mm) tall sieve columns using standard ASTM E11 or ISO 3310-1 frames—no clamps, bolts, or alignment fixtures required
• Modular sieve capacity: Supports 8 in (203 mm) and 12 in (305 mm) diameter test sieves; configurable full-, half-, and mid-height stacking configurations
• Precision digital timer: 0–99 minute range with ±1 second resolution, enabling strict adherence to standardized test durations per ASTM C136, ISO 2591-1, or pharmacopeial monographs
• Reversible cabinet door: Left- or right-hinged mounting accommodates lab layout constraints and ergonomic access requirements
• Integrated support stand: Functions simultaneously as operational base and dedicated sieve storage rack—minimizing footprint and preventing misplacement
• Robust mechanical architecture: Cast aluminum hammer assembly with hardwood-finished enclosure ensures thermal stability and acoustic dampening during extended operation

Sample Compatibility & Compliance

The Mary Ann® SS-25/SS-25F is validated for use with dry, free-flowing granular or powdered samples including APIs, excipients, catalysts, metal powders, aggregates, and ceramic precursors. It supports all standard test sieve frame dimensions (8 in and 12 in), materials (stainless steel, brass, nylon), and mesh specifications compliant with ASTM E11 (e.g., Nos. 4–635), ISO 3310-1 (R40/3 series), and USP . Its mechanical design conforms to the physical operating parameters defined in ISO 2591-1 for rotary sieve shakers and meets structural requirements for inclusion in FDA-regulated analytical method validation protocols. Routine performance verification may be conducted using certified reference standards traceable to NIST SRMs.

Software & Data Management

While the SS-25/SS-25F operates as a standalone electromechanical instrument without embedded firmware or network connectivity, its timer output and mechanical repeatability are fully compatible with external data capture systems. Laboratories implementing 21 CFR Part 11 compliance may integrate timing logs and operator entries via LIMS or ELN platforms using manual entry or barcode-scanned test records. Audit trails for sieve usage, calibration intervals, and maintenance history are maintained externally in accordance with ISO/IEC 17025 and GMP Annex 11 documentation practices. Optional accessories—including calibrated stopwatch verification kits and sieve certification documentation—support IQ/OQ validation packages.

Applications

• Pharmaceutical: Granule and powder blend uniformity testing per USP , excipient classification, and tablet formulation development
• Materials Science: Metal powder characterization for additive manufacturing feedstock qualification (ASTM F3049)
• Cement & Aggregates: Gradation analysis of sand, gravel, and supplementary cementitious materials per ASTM C136 and AASHTO T 27
• Food & Agriculture: Particle size profiling of flour, spices, feed pellets, and soil amendments
• Geology & Mining: Sieve analysis of crushed ore, tailings, and sediment samples per ISO 14688-1
• Quality Assurance: Incoming raw material inspection, batch release testing, and stability study sample preparation

FAQ

What sieve standards are supported by the SS-25/SS-25F?
ASTM E11, ISO 3310-1, and USP test sieves with 8 in (203 mm) or 12 in (305 mm) diameters are fully compatible.
Is clamping required to secure the sieve stack?
No—mechanical clamping is not used; the unit relies on gravity and precise rotational/tapping dynamics to maintain stack integrity.
Can the timer be integrated with laboratory information management systems (LIMS)?
The unit provides no native digital interface, but timer settings and run logs may be manually recorded or captured via external barcode/scanner workflows compliant with 21 CFR Part 11.
What is the maximum allowable stack height?
26 in (660 mm), accommodating up to 10 × 8-in or 6 × 12-in sieves in full-height configuration.
Does the unit require periodic calibration?
Yes—timer accuracy (±1 s), rotational speed consistency, and tapping amplitude should be verified at defined intervals per laboratory SOPs and ISO/IEC 17025 requirements.