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Send EmailSelenium Copper Master Alloy, 7440-50-8, 7782-49-2
Product Name: Selenium Copper Master Alloy (SeCu 40Se)
CAS Number: 7440-50-8 (Copper) / 7782-49-2 (Selenium)
HS Code (GTIP): 7403.29.00
Document No.: TDS-SECU-001
Issue Date: 5 May 2026
Revision: 00
SeCu 40Se is a high-concentration master alloy containing approximately 40% selenium in a copper matrix. It is specifically designed for the controlled addition of selenium to copper-based melts, ensuring uniform dispersion and consistent alloying. The product is supplied in metallic ingot form with a silver-grey appearance and a narrow melting range, enabling rapid dissolution in molten copper.
| Grade | Liquidus (K) | Solidus (K) | Liquidus (°C) | Solidus (°C) |
|---|---|---|---|---|
| 40Se | 1403 | 1403 I* | 1130 | 1130 |
*“I” denotes an isothermal transformation (likely peritectic or congruent melting), where solidus and liquidus temperatures coincide. The alloy melts at a single temperature point (approximately 1130 °C) under equilibrium conditions.
| Element | Weight % |
|---|---|
| Copper (Cu) | Balance |
| Selenium (Se) | 40.0 ± 1.0 |
Typical Impurities (max wt %):
| Iron (Fe) | Lead (Pb) | Bismuth (Bi) | Oxygen (O) | Other (each) |
|---|---|---|---|---|
| <0.005 | <0.002 | <0.001 | <0.01 | <0.005 |
Full trace element analysis is provided on each heat’s certificate of analysis.
| Property | Value |
|---|---|
| Appearance | Metallic ingot, grey-silver |
| Density (at 20 °C) | ~8.5 g/cm³ |
| Melting Point | 1130 °C (isothermal, solidus = liquidus) |
| Electrical Resistivity | Not intended as electrical material; depends on final alloy composition |
| Thermal Conductivity | Relatively low due to high Se content |
| Ingot Weight | Approx. 10–25 kg per ingot |
Phase Composition: Intermetallic compound Cu₂Se and copper-rich solid solution, providing a low liquidus temperature for easy dissolution.
Dissolution Rate: Rapidly dissolves in liquid copper at temperatures above 1150 °C, achieving high selenium recovery (>95%) with minimal dross formation.
Microstructure: Fine, homogeneous dispersion of selenium-rich phases in copper matrix, ensuring consistent alloying during dilution.
Precise addition of selenium to copper melts without introducing excessive oxide or gas pickup.
Improves machinability of copper alloys by forming finely dispersed copper-selenide particles.
Maintains high electrical conductivity while enhancing wear resistance.
Consistent sizing and chemistry reduce melting time and alloying errors.
Machining alloys: Addition to copper-zinc (brass) and copper-tin (bronze) alloys to replace lead (Pb) for ecological solutions.
Electrical contacts & switches: Used in Cu-Se and Cu-Se-Te alloys for arc-resistant properties.
Metallurgical processes: Deoxidizing and degassing agent in specific copper refining steps.
Specialty alloys: For components requiring good machinability and moderate conductivity, such as plumbing fittings, valve bodies, and precision turned parts.
Standard ingots, approximate dimensions: 500–600 mm × 100–120 mm × 60–80 mm.
Individual ingot weight: 10–25 kg (±5% tolerance).
Palletized on heat-treated wooden pallets, secured with polyester straps.
Entire pallet is shrink-wrapped with UV-resistant polyethylene film for protection during transport and storage.
Custom packaging (e.g., smaller ingots, big bags) available on request.
Storage: Keep in a dry, covered, and well-ventilated warehouse. Avoid exposure to water, humidity, and acids to prevent surface oxidation and formation of toxic selenium compounds.
Temperature: Store at ambient temperature; no special temperature control is required.
Shelf Life: Unlimited under correct storage conditions; surface discoloration may occur over time but does not affect product performance.
Handling: Use lifting equipment appropriate for pallet weight. Avoid dropping to prevent damage to ingots or packaging.
General: In solid form, the alloy presents minimal hazard. However, during melting or grinding, fumes, dust, and vapours containing selenium can be released. Selenium compounds are toxic by inhalation and ingestion.
Precautionary Measures:
Wear heat-resistant gloves, safety goggles/face shield, and flame-retardant clothing.
Use local exhaust ventilation or respiratory protection (FFP3 filter) when melting or handling molten metal.
Avoid breathing fumes; keep melting area well-ventilated.
Avoid contact with acids → may generate toxic hydrogen selenide gas.
Do not eat, drink or smoke in work areas.
First Aid: If inhaled, move to fresh air. If skin contact occurs, wash with soap and water. If ingested, seek immediate medical attention.
Environmental: Do not discharge residues into water or soil. Dispose of waste in accordance with local regulations.
For complete safety details, refer to the Safety Data Sheet (SDS) supplied with the product.
Preheat the copper charge to at least 1150 °C.
Add the SeCu 40Se ingot directly into the bath; preheating the master alloy is not necessary but may speed up dissolution.
Stir the melt gently after addition to ensure homogeneity.
Skim off any minor dross that may form.
Cast or process the final alloy using standard procedures.
Recovery rate: Expect >95% selenium recovery under normal conditions; adjust charge calculations accordingly.
Each production batch is analysed by optical emission spectrometry (OES) or X-ray fluorescence (XRF) to verify composition.
Ingot weight and dimensions are checked against accepted tolerances.
Visual inspection ensures freedom from cracks, major shrinkage cavities, and surface contamination.
A Certificate of Analysis (COA) is issued for every shipment, including heat number, lot number, and chemical composition.
| Regulation | Status |
|---|---|
| EU REACH | Contains copper (Cu) and selenium (Se); refer to SDS for registration details. |
| RoHS (Directive 2011/65/EU) | Selenium is not restricted, but the final alloy must comply if used in EEE. |
| Conflict Minerals | Sourced only from verified conflict-free smelters. |
| Transportation | Not classified as dangerous goods (solid ingot); IATA/IMDG/ADR may apply if ground to powder. |
The information provided in this Technical Data Sheet is based on our current knowledge and experience and is intended for general guidance only. It does not constitute a guarantee of specific properties or suitability for a particular application. Because conditions of use are beyond our control, the user is responsible for determining the suitability of the product for their intended purpose and for compliance with all applicable regulations. No warranty, express or implied, is made. This document does not replace a binding contractual specification.