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Processing Pebax® Elastomers

Pebax® resin has excellent processability in each of the major thermoplastic processing technologies:

  • Injection molding
  • Extrusion (e.g. cast film, blown film, sheet, tube)
  • Assembly process (e.g. overmolding, coextrusion)

Storage & Handling

For unopened bags, resin is ready-to-use without re-drying.

  • Storage temperature should be less than 40-50ºC and avoid high humidity
  • Store bags in the workshop 24 hours prior to processing to avoid condensation
  • Shelf life is 2 years from the date of delivery
  • Avoid using pellets from bags that have been open for longer than 2 hours
  • Manually close the bags after feeding the hopper to avoid moisture uptake
  • Heated hoppers are not necessary when processing Pebax® resin
  • After a one-day trial, reseal the bag before re-using the next day

Drying conditions

Pellets exposed to atmospheric conditions for more than 2 hours should be dried before processing.

 

Place the granules onto a clean flat metallic tray for efficient drying. Arkema highly recommends using vacuum drying ovens because the absence of oxygen allows for higher temperatures which saves time. Desiccant dryers are also efficient with regularly changed filters. Risk of oxidation is increased with forced-air circulation ovens.


Pebax® Grades:

7233

7033

6333

5533

4533

4033

3533

2533

Hot air
oven or vacuum
oven

Temperature (°C)

70-80

70-80

65-75

65-75

60-70

60-70

55-65

55-65

Duration (hours)

5-7

5-7

4-6

4-6

4-6

4-6

4-8

4-8

Injection molding

The rheological behavior of Pebax® elastomers allows for:

  • A wide range of processing temperatures compared to other thermoplastic elastomers
  • Ability to inject extremely thin parts (down to 0.8 mm)
  • Short cycle times
  • High recyclability
  • Accurate dimension control

Recommendations:

  • Residence time: < 10 min
  • Injection volume: 25 - 80% of total shot capacity
  • Compression rate: 2 - 2.8
  • L/D: 18 - 22
  • Correct check-valve
  • Shrinkage rate: 0.5 – 1.5%
    • Varies depending on the grade chosen and on the injection conditions

Injection molding conditions

Melt temperature (ºC):

Pebax® Grades

7233

7033

6333

5533

4533

4033

3533

2533

Minimum

230

230

230

200

200

200

180

180

Recommended

260

260

260

240

240

240

210

210

Maximum

290

290

290

270

270

270

240

240

Mold temperature (°C):

Pebax® Grades

7233

7033

6333

5533

4533

4033

3533

2533

Recommended

25-60

25-60

25-60

25-60

10-30

10-30

10-30

10-30

Dry-blending compatibility

With an extensive flexibility and hardness range, Pebax® polymers are suitable for a variety of applications. It is possible however, to mix various grades of Pebax® elastomers in order to achieve specific properties. Arkema personnel will be pleased to assist you in selecting the Pebax® blend that will meet your specification criteria.

Overmolding

Insert molding offers a countless combination of possibilities with a variety of materials such as glass, metals, polymers, and textiles.The overmolding technique is widely used to manufacture soles of athletic foootwear like soccer cleats. Pebax® resin possesses a wide plasticizing range, which makes it highly suitable for overmolding. The adhesion of Pebax® elastomers onto inserts can be optimized by adjusting the process parameters. See the general overmolding materials below and contact Arkema today to further discuss your overmolding questions.

  • Pebax® resin can overmold:
    • Other Pebax® grades, TPU (preferably ether type), PVC, leather, and coated parts
  • Pebax® resin can be overmolded by:
    • Rilsan® PA11, Rilsamid® PA12, Rilsan® Clear, and others

 

Extrusion

Thanks to the rheological properties of Pebax® resins, many extrusion and coextrusion technologies are possible:

  • Films down to 10µm in cast or blown process
  • Sheet
  • Tubes

 

Pebax® grades can be extruded on conventional equipment. Contact Arkema for more specific processing parameters such as tube sizing, blown film drawing, and cooling conditions for sheet calendaring.

Extrusion conditions

Melt temperature (°C):

 

Pebax® Grades

7233

7033

6333

5533

4533

4033

3533

2533

Minimum

220

220

210

210

210

210

190

170

Recommended

235

235

225

220

220

220

205

190

Maximum

250

250

240

230

230

230

220

210

 

 

Coloration, Welding, Decoration, Thermoforming, Sublimation...

For more processing information about Pebax® resins download the brochure and/or contact Arkema today.

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