Sulfur dioxide
Sulfur dioxide (CAS 7446-09-5), a colourless gas with the chemical formula SO2, possesses a pungent odour. It is a crucial inorganic compound widely employed in chemical synthesis and as a specialty gas. Available from Tech Serve Solutions with an assay of ≥99.9%, it serves as a key reagent in various industrial and laboratory applications, underpinning critical chemical processes.
Chemical Synthesis
Sulfur dioxide acts as a reducing agent and a precursor in the synthesis of various sulfur-containing organic and inorganic compounds. Its reactivity makes it valuable for producing sulfites, bisulfites, and sulfates, which have numerous industrial applications.
Refrigerant
Historically, sulfur dioxide was used as a refrigerant due to its thermodynamic properties. Although less common now, its ability to absorb heat upon vaporisation is a fundamental principle in refrigeration cycles.
Bleaching Agent
In certain industrial processes, sulfur dioxide is utilised as a bleaching agent, particularly for materials like wool, silk, and paper. It effectively removes colour by reducing certain chemical bonds.
Preservative
Sulfur dioxide and its derivatives, such as sulfites, are employed as preservatives in some food and beverage applications, primarily to inhibit microbial growth and prevent oxidation. However, its use is regulated.
| Molecular weight | 64.06 |
|---|---|
| Linear formula | SO2 |
| Assay | ≥99.9% |
| Boiling point | −10 °C(lit.) |
| Density | 1.25 g/mL at 25 °C(lit.) |
| Vapour pressure | 1779 mmHg (21 °C) |
| Vapour density | 2.26 (21 °C, vs air) |
| Melting point | −73 °C(lit.) |
| Impurities tested | ≤0.01% H2SO4 |
Hazard statements
- H280Contains gas under pressure; may explode if heated
- H314Causes severe skin burns and eye damage
- H331Toxic if inhaled
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
- P410Protect from sunlight
| Protective equipment | Faceshields, Gloves, Goggles, half-mask respirator (EU), half-mask respirator (US), multi-purpose combination respirator cartridge (US) |
|---|---|
| Transport (UN / ADR) | UN 1079 8(2.3) |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | T |
| Risk statements (R) | 23-34 |
| Safety statements (S) | 9-26-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Sulfur Dioxide used for?
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Sulfur dioxide is used in chemical synthesis, as a refrigerant, a bleaching agent, and a preservative. It also serves as a specialty gas in various industrial processes.
What are the CAS number and formula for Sulfur Dioxide?
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The CAS number for Sulfur Dioxide is 7446-09-5, and its chemical formula is SO2.
What grade and purity does Tech Serve Solutions supply for Sulfur Dioxide?
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Tech Serve Solutions supplies Sulfur Dioxide with an assay of ≥99.9%. This product is not represented as USP, BP, or EP grade.
What are the primary hazards associated with Sulfur Dioxide?
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Sulfur dioxide is a corrosive gas that can cause severe skin burns and eye damage (H314). It is also toxic if inhaled (H331) and contains gas under pressure; it may explode if heated (H280).
How is Sulfur Dioxide packed and shipped by TSS?
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Sulfur dioxide is supplied as a gas and is typically packed in cylinders suitable for its safe transport. TSS can export this chemical globally, adhering to all international shipping regulations.
How can I request a quote or sample for Sulfur Dioxide?
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To request a quote or sample for Sulfur Dioxide, please contact our sales team via the website or by phone, providing your specific requirements.
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