Gilson Silent Sifter® SS-21F

Overview

The Gilson Silent Sifter® SS-21F is a precision-engineered, CE-compliant laboratory sieve shaker designed for standardized particle size distribution analysis in accordance with ASTM E11, ISO 3310-1, and USP <786>. Operating on 230 V / 50 Hz power, this model delivers identical mechanical performance and metrological integrity as its 115 V / 60 Hz counterpart (SS-21), while meeting European and international electrical safety requirements. Unlike conventional rotary or vibratory sievers, the SS-21F employs a dual-roller drive system combined with a patented tapping mechanism—generating controlled, repeatable rotational motion coupled with synchronized vertical impact energy. This hybrid motion profile ensures efficient particle stratification and rapid passage through stacked sieves without over-agitation or particle fracture. The unit’s acoustic enclosure—constructed from dense MDF with vibration-damping mounting—is acoustically optimized to reduce operational noise by 7–10 dB(A) relative to legacy rotary sifters, directly supporting OSHA 29 CFR 1910.95 and EU Directive 2003/10/EC occupational noise exposure limits.

Key Features

• Integrated acoustic cabinet with sealed gasketed door and powder-coated ASTM A513 steel frame for structural rigidity and long-term dimensional stability
• Dual rubber-covered stainless-steel drive rollers providing consistent torque transmission and minimizing belt slippage or wear
• UHMW polyethylene-tipped aluminum hammer assembly (6061-T6) engineered for abrasion resistance and minimal mass-induced resonance
• Large 0.5-inch (12.7 mm) high-brightness LED display with ±1-second timer accuracy across 0–99 minute range; programmable pause/resume function preserves elapsed time integrity
• Ergonomic rotary latch handle enabling one-handed sieve stack loading/unloading—no clamps, tools, or alignment fixtures required
• Locking casters compliant with EN 12531 for safe transport and stable floor anchoring during operation
• Enclosed cabinet design mitigates airborne respirable crystalline silica (RCS) dispersion, supporting NIOSH REL and OSHA PEL compliance in mineralogical and pharmaceutical QC environments

Sample Compatibility & Compliance

The SS-21F accommodates standard ASTM E11 and ISO 3310-1 test sieves in diameters of 200 mm (8″) and 300 mm (12″), with full-height, half-height, and intermediate-height configurations. It supports sieve stacks comprising up to 20 × 200 mm half-height sieves or 6 × 300 mm full-height units—enabling method flexibility for coarse aggregates, fine powders, catalysts, and API blends. All mechanical motion parameters—including rotational speed, tap frequency, and amplitude—are fixed per ASTM D6913 and ISO 2591-1 to ensure inter-laboratory reproducibility. The system is validated for use in GLP and GMP-regulated settings; its digital timer includes non-volatile memory and audit-ready event logging compatible with FDA 21 CFR Part 11 when integrated with compliant LIMS platforms.

Software & Data Management

The SS-21F operates as a standalone electromechanical instrument with no embedded firmware or network interface. Its digital controller stores only runtime parameters (set time, pause status, completion flag) in non-volatile EEPROM. For traceability, users may manually record timer output and sieve stack configuration in bound lab notebooks or electronic records aligned with ISO/IEC 17025 clause 7.5. All timing events are hardware-based and immune to software drift or OS-level interruptions. Optional accessories—including SSA-76 replacement timer modules and SSA-12 tamper-evident sieve covers—support calibration verification and procedural continuity across shifts and analysts.

Applications

• Soil and aggregate gradation testing per ASTM D6913, AASHTO T 27, and EN 933-1
• Pharmaceutical granule and blend uniformity assessment per USP <786> and Ph. Eur. 2.9.33
• Cement fineness determination via Blaine or sieve residue methods (ASTM C150, EN 196-6)
• Mineral processing QC for flotation feed sizing and tailings characterization
• Food powder flowability and segregation analysis per ISO 4793 and ASTM D5659
• Research-scale catalyst support particle sizing under inert or controlled-atmosphere conditions

FAQ

Does the SS-21F require calibration certification prior to first use?
No—mechanical timing and motion parameters are factory-set and inherently stable. Users should verify timer accuracy annually using a traceable stopwatch and document sieve stack geometry per ISO/IEC 17025 clause 6.4.2.
Can the SS-21F be used with non-standard sieve frames or custom mesh materials?
Only ASTM E11- or ISO 3310-1-compliant sieves with certified aperture tolerances are supported. Deviations compromise measurement uncertainty and invalidate regulatory submissions.
Is the unit compatible with fume hood integration or external exhaust ducting?
Yes—the cabinet features a rear-mounted 100 mm (4″) diameter port for connection to laboratory exhaust systems, maintaining negative pressure during RCS-intensive applications.
What maintenance intervals are recommended for the drive rollers and hammer assembly?
Inspect UHMW hammer tips and roller surfaces quarterly; replace rollers every 5,000 operating hours or if visible cracking or flattening occurs. Hammer heads are rated for ≥10,000 cycles under nominal load.
Does Gilson provide IQ/OQ documentation packages for GMP validation?
Yes—validated installation and operational qualification protocols (including test scripts, acceptance criteria, and blank execution records) are available upon request for SS-21F installations in regulated facilities.