Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol)

average Mn ~5,800

Pluronic® P-123, PEG-PPG-PEG
CAS Number:
MDL number:
PubChem Substance ID:

Quality Level

vapor density

>1 (vs air)

vapor pressure

<0.3 mmHg ( 20 °C)

feed ratio

20:70:20 (EO:PO:EO)

mol wt

average Mn ~5,800


PEG, 30 wt. %

refractive index

n20/D 1.465

surface tension

34 dyn/cm, 25 °C, 0.1 wt. % in H2O


350 cP(60 °C, Brookfield)(lit.)

transition temp

Tm (DSC) 39 °C (at peak)
cloud point 90 °C (1 wt. % aqueous solution)


1.018 g/mL at 25 °C


7 - 9



InChI key


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General description

PEG-PPG-PEG (Pluronic P123) symmetric triblock copolymer constitutes of poly(ethylene oxide)(PEO) and poly (propylene oxide) (PPO). The unique characteristic of PPO block exhibiting hydrophobicity at temperatures above 288K and solubility in water at temperatures below 288K lead to formation of micelle consisting of PEO-PPO-PEO triblock copolymers. Some studies report that the hydrophobic core contains PPO block and a hydrophilic corona is comprised of PEO block. In 30wt% aqueous solution Pluronic P123® forms a cubic gel phase.


Hard and soft surface cleaners, defoamers in coatings and water treatment. Lubricant in metal working, anti-foaming aid and extender for linear and cross-linked polyesters and polyurethanes.
PEG-PPG-PEG is used in the preparation and coating of Fe-W-C(O) nanoparticles by sol gel technique. Also, employed as sacrificial templates to prepare ZnS nanospheres, nanoporous silica.


250 mL in poly bottle
1 L in poly bottle

Features and Benefits

Surface active material whose properties are dependent on the hydrophilic (EO)/hydrophobic (PO) ratio. High EO content gives better o/w stabilizers.

Physical form

Terminal primary dihydroxy-functional oligomer.

Legal Information

Pluronic is a registered trademark of BASF


10 - Combustible liquids

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. How do I find price and availability?

    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  4. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  5. What is the average molecular weight of Product No. 435465, Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol)?

    While we do not test the product to determine the molecular weight, our supplier reports the average molecular weight to be 5750.

  6. What is the pour point of Product No. 435465, Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol)?

    Our supplier reports the pour point of product 435465 to be 31 °C.

  7. I found an abbreviation of "HLB" on the webpage for Product No. 435465, Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol)?

    HLB is an empirical expression for the relationship of the hydrophilic ("water-loving") and hydrophobic ("water-hating") groups of a surfactant. The table below lists HLB values along with typical performance properties. The higher the HLB value, the more water-soluble the surfactant.

  8. What is the water content of Product No. 435465, Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol),?

    While we do not test the product to determine the water content, our supplier reports the maximum water content allowed in Prouct No. 435465 is 0.4%.

  9. What is the physical form of Product No. 435465, Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) supposed to be?

    The specification sheet describes Product No. 435465 as a semi-solid. It looks like a paste.

  10. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

Hydrogen Bonding and Transfer in the Excited State, 2 (2011)
Formation of Nanocrystalline Phases in Sol-gel Masses in the Fe-WC (O) System and Densification up to 1100? C.
Oliver CJR, et al.
Procedia Materials Science, 1, 95-103 (2012)
Functionalized nanoporous silicas for the immobilization of penicillin acylase
Chong M, et al.
Applied Surface Science, 237(1), 398-404 (2004)
Sol-Gel Derived Fe-Rich Matrix Composites Having Precipitated WC.
Alvarez EA, et al.
Advanced Engineering Materials (2014)
Facile synthesis of hollow ZnS nanospheres in block copolymer solutions
Ma Y, et al.
Langmuir, 19(9), 4040-4042 (2003)
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