Aromatic Polyester Resin CGZ-351

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Laetest Updated in April  2006

INDEX : Chemical Structure - FeaturesApplications   - Processing


Aromatic Polyester Resin CGZ-351 is homopolymers based on P-oxybenxol repeat units and are linear thermoplastics with molecular structure as follows :


CAS No: 26099-71-8


1. Excellent thermal stability

Decomposition Temperature : 530 OC
No softening below 400 OC
Continuous work temp. 300 OC

2. Outstanding wear resistance and self lubrication

Similar to graphite, MoS2, it has extraordinary self-lubricating performance. The kinetic friction coefficient is 0.16 - 0.32 that achieves lubricant-free lubrication. It is with good resistance to wear and without hurt at counter surface of friction pair in working and also with good resistance to compression wriggle.

3. Good thermal conductivity as well as dielectric properties

Its thermal conductivity is 3 -5 times to other plastics such as PTFE and the dielectric properties is also good.

  • Volume resistivity 1.2 X 1017
  • Dielectric loss tangent 3.5 - 6.4 X 10-3
4. Excellent solvent resistance

Insoluble in most organic solvents even under heating (with the exception of concentrated sulfuric acid and strong alkalis).

5. Resistance to radiation
6. Easily processing

The Aromatic Polyester powder is easy to be processed, and  widely used in the areas of machinery, electronics and electric equipment.

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Typical properties of  CGZ-351  in the application of molding

Density 1.45 g/cm3
Flexural Strength 507 KG/cm3

after aging for 15 hours at 300 OC

397 KG/cm3

after aging for 300 hours at 300 OC

353 KG/cm3
Compression Strength 1052 KG/cm3
Impact Strength (no gap) 1.0 - 1.5
Ball Hardness 31

after aging for 151 hours at 300OC

Friction Coefficient 0.16 - 0.32
Weight Loss in air for 1 hour at 400 OC 0.84 %
Thermal expansion factor 3.09 X 10-5/OC
Dielectric Constant (60 Hz) 3.58
Volume Resistance 1.27 X 1017
Dielectric loss tangent (60 Hz) 3.5 - 6.4 X 10-3

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  • In light industry and chemical industry
    1. Used as lubricant-free bearings, piston rings, pads, sealing packings etc. working at high temperature, or under water / or in moisture and vapor.
    2. Compounded with PTFE powder to make bridge slides.
  • In electronics, electric equipment and instruments industries

    Heat-resistant plugs, sockets, spools, motor parts, printed circuit boards. Due to its excellent thermal conductivity as well as insulation properties, the parts of Aromatic Polyester powder is able to efficiently remove the heat generated in  electronics' operation so that avoid damages from part overheat

  • Blends of Aromatic Polyester Powder could be sprayed and form wearable coat on moving parts, which can dramatically elongate the coated parts' life and improve the working efficiency. Besides, Aromatic Polyester could be used in lubricant-free coating, anti-corrosion coating and anti-stick coating.

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1. Heat moulding

Moulding conditions: 360 OC - 400 OC under pressure of 400 - 1000 KG/cm2 for 3 -5 minutes.

With good mechinability, the molded articles could be further machined into mechanical parts. Fillers, such as Al2O3, short-cut carbon fabric, short - cut glass fabric, can be used to improve its strength.

The finished articles of Aromatic Polyester Powder or of the resin with fillers are mainly used as heat-resistant insulators, self-lubricating bearings resistant to heat and wear, and radiation-resistant parts.

2. Cold moulding

The CGZ-351  Resin could be compounded with PTFE resin in any proportion and can be molded like PTFE resin. The CGZ-351 / PTFE composite  integrate the two materials' advantages and  overcome PTFE's shortage of poor wear resistance and cold wriggle. Testing data show that PTFE filled with 20 - 30 % Aromatic Polyester Resin has much higher maximum PV value than pure PTFE and Aromatic Polyester powder. Blending with Aromatic Polyester Powder can greatly improve PTFE's compression set , compressive strength,  wear resistance  while the friction coefficient remains.

The process includes following steps:

  1. Blending the two materials to make fine composition. Recommended Aromatic Polyester powder's proportion is 20 - 30 %. Other fillers could be used according to applications. Normally used are molybdenum disulfide, graphite, glass fabric, carbon fiber, bronze powder, etc..
  2. Moulding pressure  400 - 1000 KG/cm2
  3. Sintering temperature around 375 OC. Sintering time depends on article's thickness.
3. spray coating
4. Dispersion coating

Similar to  PTFE,  Aromatic Polyester can also be used in dispersion coating that achieve better wear resistance and friction properties than pure PTFE. Besides, the Aromatic Polyester dispersion forms thicker coat layer in every single operation than PTFE that lead to shorter operating cycle and lower cost. The Aromatic Polyester dispersion is made by dispersing  Aromatic Polyester powder in PTFE suspension.

The process includes following steps:

  1. Pre-treat the surface to be coated.
  2. Coat the surface with organic fluoride as ground coat 
  3. After drying and sintering the ground coat, proceed to Aromatic Polyester dispersion coating .Repeat the operation until reaching the required coating thickness.
  4. Recommendation:
        Drying condition: 90 - 100
    OC , 30 minutes .
        Sintering condition: 380
    OC , 15 minutes


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