Exploring Brazing Paste Applications for Organic Binders

Empower Materials Inc. manufactures the QPACR line of carbon dioxide-based polymers used for enhancing manufacturing technologies. Established in 1991 as PAC Polymers Inc, the company changed its name to Empower Materials Inc in 2001 to manifest the expansion of its application focus beyond binders for ceramic green tapes. The two key products of Empower Materials are the QPAC®25 and QPAC®40-high molecular weight thermoplastics.

brazing applications

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Poly(alkylene carbonates) are synthesized through the polymerization of epoxides and carbon dioxide. The products of their combustion are water vapor and carbon dioxide, which are environmentally friendly, non-flammable, and non-toxic. They burn cleanly in any environment, oxidizing or inert. These thermoplastic polymers are amorphous and colorless, and have low glass transition temperatures.

QPAC Organic Binders for Brazing Applications

QPAC® is ideally suited for use as an organic binder in brazing pastes and solutions.

The Benefits of Using QPAC25 and QPAC40 Organic Binders

Given below are some of the advantages of using QPAC®40 and QPAC®25 organic binders:

  • The molecular weights and viscosities of QPAC® can be customized for specific solution or paste requirements
  • QPAC® is compatible with a wide range of filler metals
  • Both grades of QPAC® are naturally “tacky” and their degrees of plasticity can be adjusted as required
  • QPAC® decomposes completely between 250 °C and 300 °C, which can be as much as 100 °C below the decomposition temperatures of other binders
  • Upon decomposition, QPAC® leaves very low ash residue with the complete burn-out of carbon
  • Decomposition is complete through three phases: liquid, solid, and vapor

Other QPAC25 and QPAC40 Organic Binder Applications

Applications of QPAC®25 and QPAC®40 organic binders include:

  • High Energy Capacitors
  • Diamond Powder Bonding
  • Air Bag Inflator Propellants
  • Thick Film Inks
  • Ceramic Fiber Processing
  • Die Attach Adhesives

Properties of QPAC25 and QPAC40 Organic Binders

The properties of QPAC®25 and QPAC®40 organic binders are tabulated below.

QPAC®25 - PEC - poly(ethylene carbonate)
Density 1.42
Chemical formula [CH2CH2OCO2]n or C3H4O3
Tensile strength 500 - 1,500 psi
Solvents Methylene chloride, Chloroform, and 1,2-Dichloroethane
Tg 25 °C
QPAC®40 - PPC - poly(propylene carbonate)
Density 1.26
Chemical formula [CHCH3CH2OCO2]n or C4H6O3
Tensile strength 5,000 - 6,000 psi
Solvents Methylene chloride, MEK, Acetone & Propylene carbonate
Tg 40 °C


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This information has been sourced, reviewed and adapted from materials provided by Empower Materials.

For more information on this source, please visit Empower Materials.


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