Methanedisulphonic acid CAS 503-40-2

Methanedisulphonic acid Basic information
Product Name:	Methanedisulphonic acid
CAS:	503-40-2
MF:	CH4O6S2
MW:	176.17
EINECS:	207-966-4
Methanedisulphonic acid Chemical Properties
Melting point	96-100°
Boiling point	263℃ at 101.3kPa
density	1.6517 (rough estimate)
vapor pressure	0Pa at 25℃
refractive index	1.5300 (estimate)
storage temp.	Hygroscopic, -20°C Freezer, Under inert atmosphere
solubility	DMSO (Sparingly, Heated), Methanol (Slightly)
form	Solid
pka	-0.71±0.50(Predicted)
color	White to Off-White
PH	-0.96 at 23.9℃ and 1g/L
Water Solubility	2458g/L(25 ºC)
Stability:	Hygroscopic
LogP	-1.49 at 25℃ and pH1
Dissociation constant	-0.17 at 25℃

Quality Assurance

Full-Process Quality Control: From incoming raw material inspection to in-process monitoring and final outgoing checks, every batch is inspected at each production stage against strict acceptance standards.
Third-Party Certified & Tested: Our quality management system is certified to ISO 9001, and products are regularly tested by accredited laboratories (e.g. SGS, TÜV). Test reports are available on request.
100% Batch Traceability: Each batch carries a unique lot number that links raw material records, production parameters, and test results, enabling complete traceability from factory to final delivery.
Pre-Shipment Inspection: Every order passes a final pre-shipment inspection, with inspection photos and reports shared before dispatch.

FAQ From Customers

Q1: What is the minimum order quantity?

A: There is no quantity limit for the first sample or trial order. Just tell us the actual quantity you need.
Q2: How can I confirm that the quality meets the requirements?

A: Provide your specifications, and our technical team will check them or customize them for you; we can provide TDS, MSDS, and COA, and accept third-party testing.
Q3: How do you ensure stable quality?

A: We manufacture under an ISO 9001 quality system, test every batch before release, and retain samples for 24 months for traceability.
Q4: Do you provide samples?

A: Yes — Free samples are available; freight is at buyer's expense for express delivery.