Jar Mill, 2-Tier LC-92 / LC-92F

Overview

The Jar Mill, 2-Tier LC-92 and LC-92F are industrial-scale, floor-mounted batch grinding systems engineered for reproducible, low-energy mechanical size reduction of dry or slurry-based solid materials. Operating on the principle of tumbling attrition—where cylindrical grinding jars rotate horizontally between counter-rotating neoprene-coated rollers—the system imparts controlled kinetic energy to the charge via rolling motion rather than impact or shear dominance. This mechanism ensures gentle yet effective comminution, minimizing heat generation and contamination risk while preserving sample integrity—critical for pharmaceutical excipient processing, ceramic raw material homogenization, mineralogical sample preparation, and catalyst precursor blending. Designed and assembled in the United States, both models feature a rigid welded steel frame, roller chain-driven transmission, and sealed ball bearings rated for extended service life under continuous operation. The dual-tier configuration enables parallel processing of two jars (each up to 5.6 L total feed capacity), significantly improving throughput without compromising process consistency.

Key Features

• Two independent tiers with synchronized roller rotation, supporting simultaneous operation of up to two grinding jars
• Neoprene-coated rollers (50.8 mm diameter) providing high-friction grip and chemical resistance against common solvents and alkaline/acidic slurries
• DC motor with solid-state speed controller enabling precise, stepless adjustment from 20 to 300 rpm—optimized for variable jar geometry, media loading ratio, and material hardness
• Robust roller chain drive system delivering high torque transmission and minimal maintenance over long-term duty cycles
• Sealed ball bearings pre-lubricated for life—eliminating routine greasing and reducing downtime during GLP-compliant lab operations
• Dual-voltage compatibility: LC-92 supports 115 V, 50–60 Hz (North America); LC-92F supports 230 V, 50 Hz (EU/UK/Asia)—both conforming to IEC 61000-6-3 EMC standards
• Modular design permits integration into automated sample prep workflows via optional analog/digital I/O interfaces (0–10 V or 4–20 mA signal output for speed feedback)

Sample Compatibility & Compliance

The LC-92 series accommodates standard cylindrical grinding jars made from porcelain, high-purity alumina (≥99.5% Al₂O₃), or stainless steel—compatible with grinding media including zirconia, agate, stainless steel, and silicon carbide spheres or cylinders. Input feed must be ≤1 mm top size; typical final particle distributions fall within 1–50 µm depending on run duration, media-to-sample mass ratio, and jar fill level (recommended 30–50% volume). Units comply with ISO 13849-1 for functional safety architecture and meet CE marking requirements for machinery (2006/42/EC). When operated with validated jar/media combinations and documented SOPs, the system supports data traceability required under FDA 21 CFR Part 11 when paired with compliant laboratory information management systems (LIMS).

Software & Data Management

While the LC-92/LC-92F operates as a stand-alone electromechanical instrument, its solid-state controller supports external logging via analog output (0–10 V proportional to actual rpm) or optional RS-485 Modbus RTU interface. Integration with SCADA or LIMS platforms enables time-stamped recording of rotational speed, runtime, and start/stop events—facilitating audit-ready documentation for GMP environments. Firmware updates (if applicable) are delivered via secure USB flash drive following NIST SP 800-53 change control protocols. No embedded operating system or cloud connectivity is included, preserving data sovereignty and network security in regulated laboratories.

Applications

• Preparation of homogeneous powder blends for X-ray fluorescence (XRF) and X-ray diffraction (XRD) analysis
• Particle size reduction of brittle oxides and carbonates prior to BET surface area measurement
• Wet grinding of pigment dispersions for coating formulation development
• Batch milling of battery cathode precursors (e.g., LiCoO₂, NMC) under inert atmosphere (when used with sealed jars)
• Standardized grinding of geological samples per ASTM D2234/D3174 protocols
• Pharmaceutical blend uniformity testing per USP and

FAQ

Are grinding jars and media included with the LC-92 or LC-92F?
No. Jars and grinding media are sold separately to allow users to select optimal material compatibility (e.g., alumina for acidic slurries, zirconia for high-density loads) and volume configurations.
What electrical certifications do these units carry?
Both models are UL-listed (UL 61010-1) and CE-marked per Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU.
Can the mill operate continuously for extended periods?
Yes—designed for 8-hour shifts with thermal protection circuitry and sealed bearings rated for >10,000 hours MTBF under nominal load conditions.
Is speed calibration traceable to NIST standards?
Rpm output is calibrated at factory using a laser tachometer traceable to NIST SRM 2034; calibration certificate available upon request.
Does the system support validation documentation for regulated labs?
IQ/OQ documentation templates—including test protocols for speed accuracy, vibration amplitude, and thermal stability—are provided with purchase for GxP compliance support.