Labthink CHY-C2A Precision Contact Thickness Gauge for Films, Foils, Paperboard, and Pharmaceutical Aluminum Foils

Overview

The Labthink CHY-C2A Precision Contact Thickness Gauge is an electromechanical thickness measurement system engineered for high-reproducibility, standardized mechanical displacement testing of thin, flexible sheet materials. It operates on the principle of controlled-force contact measurement—where a calibrated load is applied via a precision-ground measuring head onto the specimen surface, and the resulting vertical displacement is transduced with sub-micron resolution using a high-stability linear variable differential transformer (LVDT) sensor. Unlike non-contact optical or ultrasonic methods, this gauge ensures traceable, pressure-dependent thickness values aligned with international gravimetric and dimensional standards. Its dual-pressure and dual-contact-area configuration enables strict adherence to material-specific test protocols across polymer films, laminated foils, corrugated board substrates, pharmaceutical-grade aluminum foils, and technical papers—making it indispensable in QC laboratories operating under ISO/IEC 17025, GMP, or FDA-regulated environments.

Key Features

• Standard-compliant mechanical contact architecture with user-selectable pressure profiles (17.5 ± 1 kPa for films; 50 ± 1 kPa for rigid sheets) and interchangeable contact anvils (50 mm² and 200 mm²)
• 0.1 µm resolution digital displacement sensing with real-time statistical computation: mean, min, max, standard deviation, and coefficient of variation per test sequence
• Automated measurement head lift-and-lower mechanism eliminates operator-induced preload variability and ensures repeatable initial contact conditions
• Microprocessor-controlled operation with backlit LCD interface, intuitive PVC membrane keypad, and hierarchical menu navigation for parameter setup and result review
• Integrated RS232 serial port for bidirectional communication with external PCs; supports automated data logging, remote calibration verification, and firmware updates
• Factory-calibrated using NIST-traceable stainless-steel reference gage blocks; optional recalibration kits available for in-house periodic verification
• Modular hardware design accommodates optional accessories including thermal enclosure kits (for temperature-controlled testing), motorized sample positioning stages, and dedicated micro-printer modules

Sample Compatibility & Compliance

The CHY-C2A is validated for thickness determination of planar, compressible, and semi-rigid sheet materials within defined mechanical response limits. Compatible specimens include biaxially oriented polypropylene (BOPP), PET, PE, and PVDC films; metallized polyester and pharmaceutical aluminum foils (≥20 µm); uncoated and coated paperboards (150–1200 g/m² basis weight); filter papers, tissue grades, and silicone-coated release liners. All measurements conform to the physical definitions and procedural requirements of ISO 4593 (plastic film thickness), ISO 534 (paper and board), ASTM D374 (electrical insulating materials), and TAPPI T411 (thickness of paper, paperboard, and combined board). The instrument’s pressure application system satisfies the force tolerance criteria specified in ISO 2758 (bursting strength) Annex B for thickness-related preload consistency. Full compliance documentation—including Declaration of Conformity, traceable calibration certificates, and test method alignment matrices—is provided with each unit shipment.

Software & Data Management

The CHY-C2A interfaces natively with Labthink’s Lystem™ Laboratory Data Sharing System—a secure, audit-ready platform compliant with FDA 21 CFR Part 11 requirements for electronic records and signatures. Lystem™ provides role-based user access control, automated metadata tagging (operator ID, timestamp, environmental conditions), full audit trail generation, and configurable report templates aligned with ISO/IEC 17025 clause 7.8. Data export options include CSV, XML, and PDF formats compatible with LIMS integration. Optional PC-based software extends functionality with SPC charting (X̄–R, Cpk/Ppk), multi-instrument fleet monitoring, and automated pass/fail decision logic based on user-defined specification limits. All raw measurement sequences are stored with immutable timestamps and checksum-verified integrity.

Applications

This gauge serves critical metrology functions across packaging R&D, pharmaceutical primary packaging validation, pulp & paper quality assurance, and advanced materials development. Typical use cases include: verifying thickness uniformity of blister foil lidding prior to cold-forming; validating caliper consistency of barrier-coated pouch films used in sterile medical device packaging; monitoring thickness drift during roll-to-roll coating process qualification; assessing compression-set behavior of corrugated board under standardized dwell loads; and supporting stability studies where dimensional change over time must be quantified per ICH Q5C guidelines. Its robust mechanical design and stable thermal mass ensure low drift (<0.3 µm/°C) during extended shift operations.

FAQ

What standards does the CHY-C2A comply with for pharmaceutical aluminum foil testing?
It fully supports USP and Ph. Eur. 2.2.27 requirements for metallic foil thickness, as implemented through ISO 4593 and ASTM D374 methodologies with certified 50 ± 1 kPa loading.
Can the instrument measure samples with surface textures or embossing?
Yes—provided the texture depth remains below 10% of nominal thickness and the contact area fully bridges local topography; optional flat-faced or spherical-tipped anvils are available for specialized geometries.
Is GLP-compliant data archiving supported out of the box?
When paired with Lystem™ and configured with electronic signature workflows, the system meets GLP Annex 11 and OECD 17025:2017 data integrity requirements, including full audit trail retention for ≥15 years.
How often does the system require recalibration?
Annual calibration is recommended; however, daily verification using supplied reference gage blocks is required per ISO/IEC 17025 clause 6.5.2 before first use and after any maintenance event.
Does the CHY-C2A support custom pressure profiles beyond the two standard settings?
Yes—through firmware update and mechanical anvil reconfiguration, users may specify pressure ranges from 5 kPa to 100 kPa with ±0.5 kPa repeatability, subject to Labthink engineering validation.