Topo HF-2 Infrared Pellet Die Set
| Brand | Topo/TP |
|---|---|
| Origin | Tianjin, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | HF-2 |
| Price | USD 195 (approx.) |
| Die Diameter | 13 mm |
| Demountable Design | Yes |
| Maximum Pressure Tolerance | 15 tons |
| Required Accessory | HF-5 KBr Pellet Holder |
Overview
The Topo HF-2 Infrared Pellet Die Set is a precision-engineered tool designed for the preparation of uniform, translucent potassium bromide (KBr) or sodium chloride (NaCl) pellets used in Fourier Transform Infrared (FTIR) spectroscopy. It operates on the principle of uniaxial cold compression under controlled mechanical load, enabling reproducible sample thickness and optical homogeneity—critical parameters for quantitative and qualitative spectral analysis. The die set is not a standalone instrument but an essential consumable-grade accessory intended for integration with standard laboratory hydraulic or manual powder presses, specifically the FW-4A and FW-5 series tablet presses. Its robust stainless steel construction ensures dimensional stability across repeated compression cycles and resistance to corrosion from halide salts commonly used in IR sample preparation.
Key Features
- 13 mm nominal die cavity diameter—optimized for compatibility with standard FTIR sample compartments and beam path geometry.
- Fully demountable two-piece design (upper punch and lower die body) facilitating rapid pellet ejection and minimizing sample residue adhesion.
- Hardened stainless steel components with surface finish ≤0.4 µm Ra, ensuring low friction during compaction and long-term repeatability of pellet thickness (±2 µm typical variation under consistent load).
- Rated mechanical load capacity of 15 metric tons (147 kN), exceeding the operational range of FW-4A (up to 12 t) and FW-5 (up to 15 t) presses—providing safety margin and structural integrity at maximum compression settings.
- Interchangeable with Topo’s HF-5 KBr Pellet Holder, which provides secure, centered mounting of the finished pellet into the FTIR spectrometer’s sample holder without lateral displacement or tilt-induced beam attenuation.
Sample Compatibility & Compliance
The HF-2 die set is validated for use with classical IR matrix materials including KBr (≥99.9% purity), NaCl, CsI, and polyethylene dispersions. It supports sample mass ranges from 0.5–2.0 mg for KBr dilution ratios between 1:100 and 1:500 (w/w), yielding pellets 0.5–1.2 mm thick—within ASTM E1421-22 recommended dimensions for transmission-mode FTIR. All metallic components comply with ISO 8502-3:2021 for metallic surface cleanliness prior to halide contact, mitigating chloride-induced pitting. While the die itself carries no regulatory certification, its design aligns with GLP documentation requirements for sample preparation traceability when used in conjunction with calibrated press systems and logbook-maintained compression protocols.
Software & Data Management
As a passive mechanical tool, the HF-2 die set does not incorporate embedded electronics, firmware, or software interfaces. However, it integrates seamlessly into digitally documented FTIR workflows: pressure values applied via FW-4A/FW-5 presses can be recorded manually or captured via optional digital pressure transducers (e.g., Topo DP-100 series). When paired with compliant LIMS or ELN platforms (e.g., LabVantage, Benchling), users may associate die lot numbers, compression force, dwell time, and ambient humidity logs with corresponding spectral acquisitions—supporting audit readiness per FDA 21 CFR Part 11 where electronic records are maintained.
Applications
- Routine quality control of organic pharmaceutical actives and excipients via fingerprint region analysis (4000–400 cm⁻¹).
- Identification of polymer additives, plasticizers, and degradation products in packaging materials.
- Quantitative determination of moisture content in hygroscopic APIs using O–H stretching band deconvolution.
- Teaching laboratory exercises in analytical chemistry, emphasizing sample homogeneity, background subtraction, and baseline correction techniques.
- Preparation of micro-pellets for micro-FTIR mapping when combined with motorized stage systems and attenuated total reflectance (ATR) accessories.
FAQ
Is the HF-2 die compatible with non-Topo presses such as Specac or Pike?
Yes—provided the press features a standard 13 mm die cavity adapter and applies axial loading within the 0–15 ton range. Mechanical interface dimensions conform to ISO 16372:2017 for interchangeable die sets.
Does the HF-2 include the HF-5 pellet holder?
No—the HF-5 KBr Pellet Holder is sold separately and must be ordered as a complementary accessory to ensure proper alignment and clamping in the spectrometer sample compartment.
What maintenance is required to sustain die performance?
After each use, disassemble and clean components with anhydrous ethanol followed by nitrogen drying; avoid ultrasonic cleaning or abrasive cloths to preserve surface hardness and dimensional fidelity.
Can the HF-2 be used for high-pressure Raman pellet preparation?
Not recommended—Raman applications typically require diamond anvil cells or specialized dies with higher aspect ratios and thermal management; the HF-2 is optimized for IR transmission geometry and moderate compression loads.
Is calibration documentation available for the HF-2 die set?
Topo provides a Certificate of Conformance (CoC) with each shipment, listing nominal dimensions, material grade (AISI 420 stainless steel), and batch-specific surface roughness verification data.
