PLA Compound SC1

Alternative and trade names
Polylactic acid, PLA, Reinforced PLA, PLA compound
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Description

PLA is a biobased polymer derived from natural resources and offers a significant reduction in carbon footprint compared to oil-based plastics. Compound SC1 is a 20% glass reinforced compound, for use in injection molded applications, based on full stereocomplex PLA produced with PLLA and PDLA homopolymers using proprietary Total Corbion PLA technology. Compared to standard and high heat PLA, full stereocomplex PLA compounds have higher melting points and improved mechanical properties, similar to glass reinforced engineering plastics like Nylon 6 and PBT.


Biobased content of 78%

Biobased carbon content of 98%


Datasheet includes development grades, available for sampling, all data is preliminary. Total Corbion PLA does not commercially produce these compounds. Typical properties, not to be interpreted as specifications

This material data has been provided by Total Corbion.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

General

PropertyValue

Bio-based content

98.0 %

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Mechanical

PropertyValueComment

Elastic modulus

8.3 GPa

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ISO 527

Elongation

2.0

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ISO 527

Flexural modulus

6.0 GPa

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ISO 178

Impact strength, Charpy notched

10.0 kJ/m²

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ISO 179

Impact strength, Charpy unnotched

44.0 kJ/m²

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Tensile strength

135.0 MPa

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ISO 527

Thermal

PropertyValuePressureComment

Heat deflection temperature

211.0 °C

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0.45 MPa

ISO 75-1/B

195.0 °C

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1.8 MPa

ISO 75-1/A

Melting point

220.0 °C

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DSC

Technological properties

Property
Fillers

20% Glass Fiber

Other

NOTICE REGARDING USE RESTRICTIONS: Unless specifically agreed to in writing, Total Corbion PLA will not knowingly market any product into any of the following commercial or developmental applications:

  • bottles or preforms, unless specific arrangements on recycling and end-of-life are in place
  • microbeads used in personal care products, including without limitation, cosmetics or over-the-counter drugs
  • components of products intended for human or animal consumption
  • any application that is intended to be used inside the human body.
  • Processing methods

    The compounded product should be dried to <400ppm before injection molding. Precautions should be taken to avoid moisture absorption of the dried granulate during processing, for example while sitting in the hopper of the injection molding machine. In general, injection molding conditions should be selected to avoid high stresses and high (back) pressures on the material in order to limit length reduction of the glass fibers.


    It is recommended to select an injection molding machine with a low ratio of barrel volume / show weight to avoid degradation in the barrel. A barrel volume of maximum 5 times the shot weight is recommended.


    The achievable cycle time for automatic operation depends on a number of machine, mold and product properties. As the product needs time to crystallize into full stereocomplex PLA, the crystallization time in the mold typically at 120°C is the rate limiting step.


    Although automatic operation will also run using lower mold cooling temperatures, this is not recommended because this will result in products with reduced thermal and dimensional stability.


    Typical settings, may require optimization:

  • Predrying: minimum 4 hours at 85°C - Prefered to check moisture content of dried resin with e.g. Karl-Fischer or Brabender aquatrac
  • Throat: 30°C
  • Feed zone: 180°C
  • Compression zone: 220°C
  • Metering zone: 220°C
  • Nozzle: 230°C - Lower temperature can cause freezing of the nose when using a cold runner
  • Hot runner: 230°C
  • Tmold: 80-140°C - Lower mold temperature can result in failure to form full stereocomplex PLA
  • Barrel volume: Maximum 5 times the shot volume
  • Screw speed As slow as possible