Quartz Crystal Microbalance 2-inch 25-Slot Wafer Storage Cassette

Overview

The Quartz Crystal Microbalance 2-inch 25-Slot Wafer Storage Cassette is a precision-engineered handling and storage solution designed specifically for quartz crystal resonators and other thin-film substrates used in QCM-based sensing systems. It supports standardized 2-inch (50.8 mm) diameter wafers—including Si, Al₂O₃, Ge, and quartz blanks—ensuring mechanical stability, electrostatic discharge (ESD) mitigation, and contamination control during transport, cleanroom staging, or benchtop preparation prior to sensor fabrication or calibration. Constructed from chemically inert, low-outgassing polypropylene (PP), the cassette complies with ISO Class 5 (Class 100) cleanroom compatibility requirements when handled under controlled conditions. Its modular design integrates seamlessly with standard QCM oscillator modules, vacuum deposition chambers, and surface characterization workflows where substrate integrity and traceable handling are critical.

Key Features

• High-density storage for exactly 25 × 2-inch (50.8 mm) circular wafers with uniform slot spacing and edge support to prevent chipping or warping
• Dimensions: 150 mm (L) × 55 mm (W) × 60 mm (H); compact footprint optimized for glovebox integration and laminar flow cabinet placement
• Semi-transparent PP housing enables rapid visual verification of wafer presence and orientation without lid removal
• Interlocking lid with positive snap-fit mechanism ensures secure closure and prevents accidental dislodgement during transit or vibration
• Non-marking, non-abrasive slot surfaces minimize micro-scratching on polished crystal faces and electrode layers
• Compatible with standard QCM mounting fixtures, spin coaters, plasma cleaners, and solvent-based cleaning protocols (e.g., RCA, piranha)

Sample Compatibility & Compliance

This cassette accommodates rigid planar substrates up to 1.0 mm thickness and 50.8 mm ± 0.1 mm diameter. Verified compatibility includes silicon (Si), sapphire (Al₂O₃), germanium (Ge), fused silica, and AT-cut quartz crystals commonly used in gravimetric biosensing, thin-film deposition monitoring, and interfacial rheology studies. The material meets USP Class VI biocompatibility criteria and passes ASTM D543 resistance testing for common laboratory solvents (IPA, acetone, DI water). While not certified to ISO 14644-1 as a standalone cleanroom device, it is routinely deployed in ISO 5–7 environments when pre-cleaned via ultrasonic bath (2% Alconox®, 40 kHz, 10 min) and dried under nitrogen purge.

Software & Data Management

As a passive mechanical component, this cassette does not incorporate embedded electronics or firmware. However, it supports full traceability within GLP/GMP-compliant QCM workflows through integration with LIMS platforms (e.g., LabWare, STARLIMS) via manual or barcode-assisted logging. Optional laser-engraved lot numbers and custom labeling (per ISO/IEC 15415) enable batch-level tracking aligned with FDA 21 CFR Part 11 audit trail requirements. Each unit is supplied with a Certificate of Conformance detailing raw material lot, dimensional inspection report (caliper-measured tolerance ±0.2 mm), and cleanroom handling protocol.

Applications

• Pre- and post-deposition storage of QCM-D sensor crystals prior to Sauerbrey or Voigt model calibration
• Transport of functionalized quartz crystals between surface modification stations (e.g., silanization, SAM formation, antibody immobilization)
• Staging wafers for quartz crystal impedance spectroscopy (QCM-I) measurements requiring consistent thermal equilibration
• Archiving calibrated reference crystals in temperature- and humidity-controlled cabinets (23 ± 2°C, RH < 40%)
• Supporting multi-step electrochemical QCM (EQCM) experiments involving sequential electrolyte exchange and potential cycling

FAQ

Is this cassette compatible with automated wafer handlers?
No — it is manually operated and lacks robotic interface features (e.g., FOUP alignment pins or SEMI E15.1 compliance). For automation, consult the QCM-AutoLoad series.
Can it be sterilized using autoclaving?
No — polypropylene softens above 121°C; dry heat (150°C, 2 h) or ethylene oxide (EtO) sterilization is recommended for bioassay applications.
What is the maximum operating temperature range?
Continuous use up to 90°C; short-term exposure (≤30 min) up to 105°C is permissible but may reduce long-term dimensional stability.
Are custom slot configurations available?
Yes — OEM configurations including 3-inch (76.2 mm) and 4-inch (101.6 mm) variants with 25-slot layouts are offered under model codes QCM-25-3IN and QCM-25-4IN.
Does the cassette include documentation for regulatory submissions?
Yes — each shipment includes a Declaration of Conformity, material safety data sheet (MSDS), and dimensional validation report compliant with ISO/IEC 17025-accredited calibration practices.