Molekula
BUTANOX M-50
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
BUTANOX M-50 is methyl ethyl ketone peroxide (MEKP), a ketone peroxide that acts as an organic peroxide radical initiator. It is commonly employed as a room-temperature curing agent for unsaturated polyester and vinyl ester resins, such as those used in fibreglass laminates and gelcoats. Available in 1 kg and 25 kg containers, it has a molecular formula of C8H18O6, a molecular weight of 210.22 g/mol, and should be stored at 2 to 8 °C. No signal word is assigned. Molekula supplies BUTANOX M-50 from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
Specifications available on request — see Documents below or contact our sales team.
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Flash Point | 74 °C |
| Transport Class | 5.2 |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless liquid |
| Odour | Typical odor-resembles that of acetone. |
| Boiling Point | 19 °C |
| Density | 1.10-1.17 (relative, water = 1) |
Source: PubChem CID 3672772 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 90037729 |
| CAS Number | 1338-23-4 |
| IUPAC Name | 2-hydroperoxy-2-(2-hydroperoxybutan-2-ylperoxy)butane |
| EC Number | 215-661-2 |
| Molecular Formula | C8H18O6 |
| Molecular Weight | 210.22 |
| Exact Mass | 210.1103 |
| SMILES | CCC(C)(OO)OOC(C)(CC)OO |
| InChIKey | WFUGQJXVXHBTEM-UHFFFAOYSA-N |
| InChI | InChI=1S/C8H18O6/c1-5-7(3,11-9)13-14-8(4,6-2)12-10/h9-10H,5-6H2,1-4H3 |
| PubChem CID | 3672772 |
| UN Number | UN3105 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2909605000 |
| Tariff Code | 2909601000 |
Safety & GHS
-
Oxidizing
GHS03
-
Corrosive
GHS05
-
Health Hazard
GHS07
Hazard statements
- H227 Combustible liquid
- H242 Heating may cause a fire
- H302 Harmful if swallowed
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
- H332 Harmful if inhaled
- H401 Toxic to aquatic life
Precautionary statements
- P210 Keep away from heat/sparks/open flames/hot surfaces - No smoking
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 2-BUTANONE PEROXIDE
- Butanox LPT
- Esperfoam FR
- Ketonox
- Lupersol DEL
- MEKP
- Mepox
- Methyl ethyl ketone peroxide
- Quickset super
- Thermacure
Frequently asked questions
What is BUTANOX M-50 used for?
BUTANOX M-50 is a peroxide initiator used as the standard room-temperature curing agent for thermoset unsaturated polyester resins, such as fibreglass and gelcoats.
What is the chemical formula and molecular weight of BUTANOX M-50?
The formula is C8H18O6 and the molecular weight is 210.22 g/mol.
How should BUTANOX M-50 be stored?
It should be stored at temperatures between 2 and 8 °C to maintain stability and prevent decomposition.
What grade of BUTANOX M-50 is available?
Molekula supplies BUTANOX M-50 in technical grade, suitable for industrial polymerization applications.
Can Molekula supply BUTANOX M-50 in bulk?
Yes, Molekula can supply BUTANOX M-50 in bulk quantities; please contact our sales team for volume pricing and availability.
What documentation comes with a BUTANOX M-50 order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS), compliant with GHS standards.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.