MAXI44 Microwave Digestion Vessel Set for Milestone Systems – PTFE Inner Vessels (100 mL) with External Rotor AEX00023

Overview

The MAXI44 Microwave Digestion Vessel Set is a precision-engineered consumable system designed exclusively for compatibility with Milestone’s high-throughput MAXI microwave digestion platforms. This set comprises 44 individual PTFE (polytetrafluoroethylene) inner vessels—each with a nominal capacity of 100 mL—mounted within the proprietary AEX00023 external rotor assembly. The system operates on the principle of closed-vessel microwave-assisted acid digestion, wherein electromagnetic energy at 2.45 GHz is coupled into sample–acid mixtures under controlled temperature and pressure conditions to achieve complete mineralization of organic and inorganic matrices. Engineered for reproducible thermal transfer and chemical inertness, the PTFE inner vessels resist attack from concentrated HNO₃, HF, HCl, and aqua regia up to 260 °C and 80 bar, enabling trace-level elemental analysis by ICP-OES, ICP-MS, or AAS without vessel-induced contamination.

Key Features

• 44-position high-density configuration optimized for batch processing in Milestone MAXI series digesters (e.g., ETHOS UP, START, and EXPLORER systems)
• PTFE inner vessels manufactured from virgin, USP Class VI–compliant fluoropolymer with low extractables and negligible metal background (≤0.1 pg/g for As, Cd, Cr, Pb, U)
• AEX00023 external rotor constructed from reinforced polyetherimide (PEI), rated for continuous operation at ≤300 °C and compatible with automatic rotor recognition protocols
• Tight-tolerance sealing interface between PTFE vessel and rotor lid ensures leak-free pressurization and eliminates cross-contamination during multi-sample runs
• Autoclavable and reusable up to 100 cycles when cleaned per ASTM D5127–22 guidelines; vessel geometry supports uniform microwave field distribution and minimizes hot-spot formation

Sample Compatibility & Compliance

The MAXI44 vessel set accommodates solid, semi-solid, and liquid samples across environmental, geological, clinical, food, and polymer testing workflows—including soils, sediments, plant tissues, biological fluids, pharmaceutical excipients, and plastic additives. Each PTFE vessel meets ISO 17025:2017 requirements for calibration traceability of volumetric capacity (±2% tolerance at 100 mL). The material composition complies with FDA 21 CFR §177.1550 for repeated-use food-contact applications and conforms to EU Regulation (EC) No. 1935/2004 for materials intended to come into contact with foodstuffs. Batch-specific certificates of conformance—including heavy metal screening (ICP-MS verified) and dimensional inspection reports—are supplied with every order.

Software & Data Management

While the vessels themselves are passive hardware components, their use is fully integrated into Milestone’s Ethos TC and Milestone Connect software ecosystems. The AEX00023 rotor ID is auto-detected upon insertion, triggering preloaded method parameters (ramp time, hold temperature, maximum pressure limit) aligned with EPA Method 3052, ISO 15587-1, and ASTM D5511. All digestion sequences support full audit trail generation compliant with FDA 21 CFR Part 11—capturing operator ID, timestamped temperature/pressure profiles, vessel position mapping, and failure event logs. Raw data export formats include CSV, XML, and LIMS-ready .sld files for traceability in GLP and GMP environments.

Applications

• Environmental monitoring: Total recoverable metals in EPA SW-846 6010D/6020B-compliant digests
• Clinical toxicology: Quantification of essential/toxic elements (e.g., Se, Zn, Al, Ni) in serum, urine, and tissue homogenates
• Geochemical exploration: Rare earth element (REE) and transition metal profiling in rock powders and core samples
• Food safety: Detection of regulated contaminants (As, Cd, Pb, Hg) per EU Commission Regulation (EU) No. 836/2011
• Materials science: Leachate analysis of catalysts, battery cathodes, and nanocomposites following ISO 10993-12 extraction protocols

FAQ

Are these vessels certified for use with hydrofluoric acid (HF)?

Yes—virgin PTFE exhibits exceptional resistance to HF across concentrations up to 40% v/v and temperatures up to 220 °C; however, HF digestion requires strict adherence to Milestone’s safety addendum for fluoride handling and post-digestion neutralization.
Can I substitute these vessels in non-Milestone instruments?

No—the AEX00023 rotor geometry, pressure-sensing port alignment, and RFID tag frequency are proprietary to Milestone MAXI platforms; mechanical or thermal mismatch may compromise safety interlocks.
What is the recommended cleaning protocol between uses?

Rinse sequentially with deionized water, 5% HNO₃ (v/v), and acetone; dry in a Class 100 laminar flow hood; verify cleanliness via blank digestion and ICP-MS analysis before reuse.
Do you provide lot-specific QC documentation?

Yes—each shipment includes a Certificate of Conformance listing batch number, manufacturing date, dimensional verification results, and ICP-MS blank test data for 22 elements.