1,3-Propanedisulfonic acid
1,3-Propanedisulfonic acid (CAS 21668-77-9), with the molecular formula C3H8O6S2 and a molecular weight of 204.22, is a sulfur-containing organic compound. It is supplied as a 70% aqueous solution. This compound serves as a valuable building block in chemical synthesis and finds application in the creation of various organic molecules, particularly those involving sulfur functionalities.
- Synonyms
- C3H8O6S2

Organic Synthesis Intermediate
1,3-Propanedisulfonic acid acts as a key intermediate in the synthesis of complex organic molecules. Its disulfonic acid structure allows for diverse chemical transformations.
Building Block for Specialty Chemicals
This compound is utilised as a foundational building block for developing specialty chemicals, leveraging its unique sulfonate groups for tailored properties.
Research and Development
It is employed in research laboratories for exploring new synthetic routes and developing novel compounds with potential applications in various chemical fields.
| Molecular weight | 204.22 |
|---|---|
| Empirical formula | C3H8O6S2 |
| Concentration | 70% in H2O |
| Impurities tested | ≤5% n-butanol(w/v) |


Hazard statements
- H302Harmful if swallowed
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Transport (UN / ADR) | UN 1760 8 / PGII |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | C |
| Risk statements (R) | 20/21/22-34 |
| Safety statements (S) | 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 1,3-Propanedisulfonic acid used for?
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1,3-Propanedisulfonic acid (CAS 21668-77-9) is used as a building block in organic synthesis and for the development of specialty chemicals in research and development settings.
What is the CAS number and formula for 1,3-Propanedisulfonic acid?
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The CAS number for 1,3-Propanedisulfonic acid is 21668-77-9, and its empirical formula (Hill notation) is C3H8O6S2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 1,3-Propanedisulfonic acid as a 70% solution in water, with impurities of n-butanol not exceeding 5% (w/v). We do not represent this product as USP/BP/EP grade.
How should 1,3-Propanedisulfonic acid be handled?
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1,3-Propanedisulfonic acid is classified as a danger. It is harmful if swallowed, in contact with skin, or if inhaled, and causes severe skin burns and eye damage. Appropriate personal protective equipment (PPE) such as gloves, eye protection, and protective clothing must be worn, and handling should occur in a well-ventilated area. Refer to the safety data sheet for comprehensive handling information.
Is 1,3-Propanedisulfonic acid a controlled substance?
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Based on the provided data, there is no indication that 1,3-Propanedisulfonic acid is a controlled substance.
How is 1,3-Propanedisulfonic acid shipped and exported?
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1,3-Propanedisulfonic acid is shipped under UN 1760, Hazard Class 8, Packing Group II. Tech Serve Solutions specialises in global export of fine chemicals.
How can I request a sample or quote for 1,3-Propanedisulfonic acid?
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To request a sample or a quote, please contact our sales team via the website or by phone, providing the product name and CAS number (21668-77-9).
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