Buyer decision guide

EDDM Grades 90% / 92% / 95% — Which One Do You Need?

A brand-free selection guide for (ethylenedioxy)dimethanol (EDDM, CAS 3586-55-8) across its three commercial active-content grades. Same chemical — active content is the primary difference, while the 95% grade also carries tighter appearance and specification distinctions and is preferred for lower-water or more concentrated applications. Use the logic below to pick the right grade for metalworking fluids, in-can preservation, or non-triazine H₂S scavenging.

Quick answer: choose EDDM 90–92% for most preservation and metalworking-fluid duties, and EDDM 95% when you need higher active-per-kg economy, lower water content, or the tighter appearance/specification profile of the high-purity grade — for example concentrated oilfield H₂S scavenger blends. For preservation and metalworking-fluid duties, performance is set by your in-use dosage (0.10–0.30%), not by the supplied grade alone; H₂S-scavenging duty is instead dosed to the sulfide load and required contact time rather than a fixed percentage.

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Grade Comparison

ParameterEDDM 90%EDDM 92%EDDM 95%
Active content≈90%≈92%≥95%
Total aldehyde≥45%≥45%≥47%
AppearanceColourless to pale yellow liquidColourless liquid
Typical best useIn-can preservation, MWFMWF, coatings, H₂S blendsConcentrated H₂S scavenger, low-water blends
Active per kg shippedBaseline~2% more~5% more (best freight economy)

Shared identity across all grades: CAS 3586-55-8 · EINECS 222-720-6 · molecular formula C₄H₁₀O₄ · molecular weight 122.12 g/mol.

Which Grade Do I Need?

Packaging (All Grades)

  • 25 kg HDPE drums
  • 200 kg MS drums
  • 1000 kg IBC tanks
  • ≈22 MT per 20-foot FCL · custom packaging on request

Full Technical Data & Related Reading

Frequently Asked Questions

What is the difference between EDDM 90%, 92% and 95%?+
All three are the same chemical — (ethylenedioxy)dimethanol, CAS 3586-55-8 — with active content as the primary difference. The 95% grade also carries tighter appearance and specification distinctions, and it is typically preferred where lower water content or higher active-per-kg dosing economy is required, such as concentrated oilfield H2S scavenger blends. EDDM 90% and 92% remain the standard commercial grades for most in-can preservation and metalworking-fluid applications.
Which EDDM grade should I use for metalworking fluids?+
For full-synthetic, semi-synthetic and emulsified metalworking fluids, EDDM 90–92% is the standard choice. It is neutral in pH, aluminium-compatible, non-corrosive to steel, and effective across pH 6–11 at typical in-use dosages of 0.10–0.30%. The higher-active 95% grade is only needed when you want to minimise added water in a concentrate.
Which grade is best for H2S scavenging in oil and gas?+
For non-triazine H2S scavenging, the 92% and 95% grades are generally preferred because higher active content means more scavenging capacity per litre injected and lower freight cost per kg of active. EDDM reacts with H2S at ambient temperature without forming salt precipitates or poisoning downstream catalysts.
Does a higher EDDM grade mean better biocidal performance?+
Not directly — biocidal performance depends on the in-use active concentration you dose, not the supplied grade. A higher grade simply contains more active per kilogram, so you dose slightly less product to reach the same in-use level. Choose the grade based on freight economics, water-content tolerance and formulation convenience, then set dosage to the target active concentration.
What COA parameters should I check when buying EDDM?+
Key certificate-of-analysis parameters are: active content (%), total aldehyde content (%), appearance (colourless to pale yellow liquid), pH of 1% aqueous solution (6.0–8.0), density at 20°C (1.180–1.200 g/ml), refractive index at 20°C (1.430–1.443), and flash point of the formulated product (>100°C). Every batch from Vasudev Chemo Pharma ships with a batch-specific COA.
What packaging sizes are available for each EDDM grade?+
All grades are available in 25 kg HDPE drums, 200 kg MS drums, and 1000 kg IBC tanks, with roughly 22 MT loading per 20-foot FCL. Packaging choice is independent of grade — select it by order volume, dosing infrastructure and shipping mode.

Not sure which EDDM grade fits your process?

Vasudev Chemo Pharma manufactures EDDM (CAS 3586-55-8) in 90%, 92% and 95% grades at our ISO 9001:2015 certified facility in Gujarat, India, with batch-specific COA and global export in FOB, CIF and DDP terms. Tell us your application and we'll recommend the right grade and dosage.

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