company tower banner
Stepan Company Company Logo

STEPAN® MWA-251

STEPAN® MWA-251 is a 100% active nonionic surfactant used as a wetting agent and for co-emulsification of difficult-to-solubilize components. It can be used as an emulsifier and coupling agent for metalworking formulations. It can enable improved performance in metal cleaning in metalworking applications and enhance lubricity in metalworking applications. It shows improved lubrication by showing a reduced average scar when compared to the current industry standard.

Brand: STEPAN (48 products)

Functions: Anti-Wear Agent, Coupling Agent, Emulsifier, Extreme Pressure Additive, Surfactant (Nonionic)

Features: Excellent Emulsifiability, Excellent Lubricity, Good Wetting Properties

End Uses: Metalworking Fluids

Enhanced TDS

Knowde-enriched technical product data sheet

Identification & Functionality

Features & Benefits

Fluids & Lubricants Features
Product Benefits
  • 100% active
  • Standard emulsifier chemistries
  • Hard water tolerant
  • Metal cleaning components, low foaming and coupling agent capabilities

 

Functional Characteristics.

 

STEPAN® MWA Products Product Class Sub-Class Functional Characteristics
Emulsification Lubricity Antifoaming Metal Cleaning Hard Water Tolerance Antimisting Corrosion Inhibition Coupling Agent Biocidal Inert
200 Series Alkoxylates Castor Oil X X              
Alcohol X X X X X     X  
Nonyl Phenol X X     X        
EO/PO Polymers X X              

Applications & Uses

Markets
Applications
Fluids & Lubricants Type
Fluids & Lubricants End Use
Applications
  • STEPAN MWA-251 is 100% active nonionic surfactant used as a wetting agent and for co-emulsification of difficult to solubilize components. This surfactant has a lowered pour point to reduce handling problems.
  • STEPAN MWA-251 can be used as an emulsifier and coupling agent for metalworking formulations. It can enable improved performance in metal cleaning in metalworking applications and enhances lubricity in metalworking applications.

Properties

Physical Form
Appearance
Light amber liquid (at 25°C)
Soluble in
Water, Methanol
Insoluble in
Kerosene
Typical Properties
ValueUnitsTest Method / Conditions
Cloud Point (1% in 10% NaCl)50°C-
Density (at 25°C)8.5g/ml-
Flash Pointmin. 94°CPMCC Flash Point Tester
HLB12--
Moisture Contentmax. 0.25%-
pH (in 1% aqueous)6--
Pour Point21°C-
Regulated Volatile Organic Chemicals0%U.S. EPA
Viscosity (at 25°C)2000cPs-

Regulatory & Compliance

Chemical Inventories
Clearances

The international inventories (country clearances) of STEPAN MWA-251 can be found in Section 15 of the Safety Data Sheet (SDS). It is the responsibility of the formulator to review the chemical control regulations for each country where the end-product is intended to be sold or used.

Technical Details & Test Data

Falex Four-Ball Wear Test

Lubricity is measured using the Falex Four-Ball Wear test and is used to determine the wear-preventing properties of lubricants in metalworking applications. Lubricants are compared using the average size of the scar diameters worn on the three lower clamped balls. STEPAN MWA-251 shows improved lubrication by showing reduced average scar when compared to the current industry standard.

FALEX 4-Ball Wear (ASTM D-4172B) Average Scar, Diameter, mm
Commercial Standard 0.628
STEPAN MWA-251 0.525

 

Packaging & Availability

Packaging Type
Standard Packaging

STEPAN MWA-251 is available in drums.

Storage & Handling

Storage & Handling
  • Contact with the eyes and prolonged contact with the skin should be avoided. Wash thoroughly after handling materials.
  • Normal safety precautions (i.e., gloves and safety goggles) should be employed when handling STEPAN MWA-251. Contact with eyes, nose or prolonged contact with skin should be avoided. Wash thoroughly after handling STEPAN MWA-251. See SDS for more information.
Workplace Exposure

Occupational exposure can occur primarily through skin contact or via inhalation of vapors and mists. Engineering controls, personal protective equipment, and other workplace practices should be used to control these exposures. See SDS for more information.