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Premier Polyether Polyol: Polytetramethylene Ether Glycol (PTMEG)

published on April 10, 2020

Polytetramethylene Ether Glycol (PTMEG) is the premier polyether polyol used worldwide in the manufacture of high-performance polyurethane elastomers. Known for its many performance attributes and advantages, PTMEG is used in a variety of applications, including polyurethane resins, prepolymers, coatings, adhesives, cast polyurethane resins, spandex fibers, and more.

  PTMEG 210 PTMEG 650 PTMEG 1000 PTMEG 1400 PTMEG 1800 PTMEG 2000 PTMEG 3000
PU Resins + ++ ++ ++ ++ ++ +
Prepolymers   + ++ ++ ++ ++  
Coatings ++ ++ + + + +  
Adhesives + ++ +     +  
Cast PURs   ++ ++ ++ ++ ++ +
TPUs   + ++ ++ ++ ++ +
TPEEs/TPEAs   + ++ + + ++  
Spandex Fibers     + + ++ ++  

+ Recommend, ++ Highly Recommend, Blank Can Be Used

Gantrade Corporation is a leading supplier of PTMEG, meeting needs for high performance polyurethane products worldwide.

 

PTMEG Attributes in Polyurethane Elastomers

Processors know PTMEG as a high-performance polyol capable of formulating polyurethane elastomers in several positive directions, whether it’s flexibility, dynamic properties, hydrolytic stability, or abrasion resistance.

PTMEG-based polyurethanes exhibit the following attributes:

  • Superior resistance to hydrolytic cleavage
  • Excellent flexibility and property retention at low temperatures
  • High resiliency and rebound properties
  • Excellent mechanical and dynamic properties, as well as low hysteresis
  • Outstanding impingement abrasion resistance
  • Good processing characteristics

 

PTMEG Specifications

Gantrade offers a robust selection of PTMEG polyols available in a broad range of molecular weights. While the workhorse grades of PTMEG are the 1000, 1800 and 2000 MW diols, the PTMEG 210 and 650 grades are notable, as formulators find them easier to handle liquids at room temperature and exhibit lower viscosities. PTMEG 3000 is a grade of interest when seeking enhanced resiliency and rebound, as well as abrasion properties.

Grade Hydroxyl Number, OH (mg KOH/g) Molecular Weight Color, APHA Acid Number (mg KOH/g) Water (%) Melting Point (°C)

Flash Point, OC (°C)

Density (g/cm3) at 40°C

Viscosity (mPa•s at 40°C)

210 477-606 185-235 Max. 40 Max. 0.05 Max. 0.030 -5 Min. 160 0.98 30-50
650 166-180 625-675 Max. 40 Max. 0.05 Max. 0.020 11 Min. 230 0.978 160
1000 107-117 959-1049 Max. 50 Max. 0.05 Max. 0.015 24 Min. 260 0.977 268
1400 77-84 1336-1457 Max. 50 Max. 0.05 Max. 0.015 27 Min. 260 0.976 400
1800 60-65 1726-1870 Max. 50 Max. 0.05 Max. 0.015 27 Min. 260 0.975 1070
2000 53-59 1901-2117 Max. 50 Max. 0.05 Max. 0.015 27 Min. 260 0.974 1270
3000 35-39 2877-3206 Max. 50 Max. 0.05 Max. 0.015 30 Min. 260 0.974 3108

 

Physical Forms of PTMEG Grades

The different grades of PTMEG available come in a variety of physical forms, which in turn affect processing. PTMEG  650, for example, has a softening point of 11°C (52°F) and can be a liquid at room temperature. PTMEG 1000, along with the other offerings in higher molecular weight grades, appears in the form of low-melting waxy white solids, with softening points starting at about 24°C (75°F). Processors must heat higher molecular weight grades in order to liquefy and discharge them from drums or ISO Tanks.

It’s important to note that drums are rolled when re-melted to avoid segregation of the various molecular weight fractions that make up PTMEG. Gantrade can supply the viscosity temperature profiles for each of the grades of PTMEG diols.

Viscosity and Temperature

The chart below shows the relationship between the viscosity of various grades of PTMEG and the temperature.

PTMEG-Viscosity-vs-Temperature

The following chart compares the hydrolysis resistance of a PTMEG 2000/MDI/BDO based elastomer vs. polyester systems based on 1,6-hexanediol adipate and 1,4- butanediol adipates under extreme conditions of superheated steam.

Screen Shot 2020-04-10 at 3.20.14 PM

 

Available Grades of PTMEG (by Molecular Weight)

Gantrade offers the following grades of PTMEG diols*:

  • PTMEG 210
  • PTMEG 650
  • PTMEG 1000
  • PTMEG 1400
  • PTMEG 1800
  • PTMEG 2000
  • PTMEG 3000

*The grade designations refer to the average molecular weights of the PTMEG diols.

 

PTMEG Packaging           

Gantrade supplies PTMEG in 200 kg (441 lb.) factory sealed iron drums and 20 MT (44,080 lb.) bulk heated ISO tanks. The minimum order size is one drum. Sample sizes are 1 kg and 20 kg containers.

 

Safety and Handling                                                  

PTMEG polyols are non-hazardous, stable products with a low order of toxicity. PTMEG is stable under proper storage and handling conditions and possesses a high flashpoint. Always prevent electrostatic discharge and ensure adequate ventilation in the work and storage areas.

Gantrade Corporation encourages its customers to have a comprehensive understanding of the health, safety, environmental and regulatory information on its products before handling and disposal. To obtain a Safety Data Sheet (SDS) and other handling information, please contact us using the contact form on www.gantrade.com or call 201-597-5566. 

 

Gantrade: Your Partner for High-Performance Polyurethane Polyols

To explore which PTMEG polyol is best suited for your unique needs, partner with Gantrade. Our team, armed with a wealth of technical knowledge and expertise, can guide you to the best solutions for your applications. Contact Gantrade today to get started. We offer a wide portfolio of products to achieve your high-performance polyurethane requirements.

Topics: Urethane Intermediates