Allied TEM Wedge-Style Sample Preparation Fixture

Overview

The Allied TEM Wedge-Style Sample Preparation Fixture is a precision-engineered mechanical assembly designed to support reproducible, geometry-controlled thinning of electron-transparent specimens for transmission electron microscopy (TEM) and focused ion beam (FIB) analysis. Unlike conventional planar polishing fixtures, this wedge-style system enables controlled angular offset between the sample surface and polishing plane—critical for generating electron-transparent edges with minimal taper and artifact-free interfaces. The fixture operates on a kinematic mounting principle, integrating rigid anodized aluminum structural components with low-friction Delrin® feet and glass leveling shims to ensure micron-level planarity and angular stability during mechanical polishing or ion milling. Its modular architecture accommodates both thermosetting embedding workflows (using hot-mounting wax or epoxy adhesives) and room-temperature bonding protocols (e.g., Loctite 460T), making it suitable for brittle ceramics, metallic interconnects, semiconductor heterostructures, and multilayer thin-film devices.

Key Features

• Anodized aluminum frame providing high corrosion resistance, dimensional stability, and non-magnetic compatibility with high-field TEM stages
• Dual-side cam-lock lever mechanism allowing operator-selectable installation orientation without tooling—enabling rapid reconfiguration for left- or right-handed workstations
• Low-profile handle design engineered to maintain unobstructed optical access in standard SEM chambers; eliminates need for sample removal during intermediate inspection
• Interchangeable flat plates—including #15-1010 cross-section plate with removable 3.1 mm SEM-compatible pin and #15-1013 TEM/FIB thinning plate fitted with two heat-resistant borosilicate glass inserts—to support diverse specimen geometries and thermal management requirements
• Integrated heating/embending shaft (#15-1017) compatible with standard hot-mount presses for controlled thermal embedding of temperature-sensitive materials
• Modular micrometer interface supporting both low-profile (69-42000) and non-rotating (69-42005) variants to minimize parallax error and improve depth-of-field control during wedge angle adjustment

Sample Compatibility & Compliance

This fixture supports specimens ranging from 1–10 mm in thickness and up to 25 mm in lateral dimension, including sintered ceramics, solder joints, MEMS devices, battery electrode cross-sections, and metallurgical interfaces. All included consumables—EpoxyBond 110™, Loctite 460T, and hot-mounting wax—are formulated for low outgassing and minimal carbon contamination under high-vacuum TEM conditions. The system complies with ASTM E3–22 (Standard Guide for Preparation of Metallographic Specimens) and ISO 14577–1:2022 (Metallic materials — Instrumented indentation test) for mechanical preparation traceability. While not certified to GLP or GMP standards per se, its repeatable clamping force, documented angular repeatability (< ±0.15°), and audit-ready component labeling (per Allied part numbering convention) support regulatory-compliant lab documentation under FDA 21 CFR Part 11 when paired with validated SOPs.

Software & Data Management

The Allied TEM Wedge-Style Fixture is a fully manual, hardware-only preparation system—no embedded firmware, drivers, or proprietary software are required. Angular positioning, pressure application, and polishing duration are controlled externally via standard mechanical polishing units (e.g., Allied High-Tech Model 300, Buehler EcoMet 300). However, all component part numbers (e.g., #69-40037, #71-10040) are traceable through Allied’s publicly accessible digital parts catalog and technical bulletins (Revision D, 2023), enabling full bill-of-materials (BOM) documentation for internal QA audits. Consumable lot numbers—when recorded manually—can be linked to instrument logbooks or LIMS entries to satisfy ISO/IEC 17025 clause 7.7 (Sampling) and clause 7.8 (Ensuring validity of results).

Applications

• Preparation of site-specific TEM lamellae from bulk materials prior to FIB lift-out
• Controlled wedge polishing of GaN-on-silicon HEMT structures for interface analysis
• Cross-sectional imaging of Cu/low-k interconnect stacks in advanced logic nodes
• Failure analysis of solder fatigue cracks in automotive electronics modules
• Interface characterization of solid-state battery cathode/anode bilayers
• Crystallographic orientation mapping of polycrystalline turbine blade coatings via pre-tilt alignment

FAQ

Is this fixture compatible with automated polishing systems?
Yes—its standardized base footprint and M6 threaded mounting holes align with OEM fixtures from Allied, Buehler, Struers, and LECO. Integration requires no adapter plates.
Can the glass inserts withstand repeated thermal cycling during hot-mounting?
The borosilicate glass inserts (#15-1013) are rated for continuous use up to 150 °C and exhibit ≤0.05% dimensional drift after 50 thermal cycles (25–120 °C).
What is the recommended torque for cam-lock lever engagement?
Maximum specified torque is 1.2 N·m; exceeding this may deform the aluminum lever arm and compromise angular repeatability.
Are replacement Delrin® feet available as standalone items?
Yes—part #69-40035 (for 69-42005) and #69-40037 (for #15-2218 micrometers) are stocked globally through Allied’s authorized distribution network.
Does the kit include calibration documentation?
Each production batch includes a Certificate of Conformance (CoC) verifying material composition (6061-T6 aluminum), anodization thickness (≥15 µm), and dimensional verification per ASME Y14.5–2018 GD&T tolerances. NIST-traceable calibration certificates for micrometers are provided separately by the micrometer manufacturer.