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Characteristics of the Plastic Materials Used in Injection

Plastic Materials : Low density polyethylene – LDPE

LDPE is a semi-crystalline flexible thermoplastic. It is particularly used for the manufacture of film, flexible hose, toy, flexible bottle …

Strong points Weak points
  • Food Grade
  • Great chemical inertness
  • Unbreakable
  • Flexible
  • No moisture recovery
  • Hard to stick
  • Little mechanical resistance
  • Cracks easily under duress
  • Bad heat resistance

 

Plastic Materials : High density polyethylene – HDPE

HDPE is a semi-rigid and semi-crystalline thermoplastic. It is used in particular for the manufacture of chemicals, toy, slide, etc.

Strong points Weak points
  • Identical to that of LDPE
  • Better rigidity than LDPE
  • Non-stick
  • Chemical resistance
  • Identical to that of LDPE

 

Plastic Materials : Polypropylene homo – PPH

PPH is a semi-crystalline rigid thermoplastic. It is mainly used in cosmetics, pharmaceuticals, food industry, cans, electronics, garden furniture …

 

Strong points Weak points
  • High rigidity
  • Transparency
  • resistance to chemicals Good
  • resistance to high temperatures Good
  • flexural strength, hinge effect Good
  •  mechanical strength, rigidity Good
  • Difficult collage
  • High frequency welding impossible
  • Fragile at low temperature

 

Plastic Materials : Polypropylene Copolymer – PPC

PPC is a very flexible thermoplastic from the semi-crystalline family. It is used in other food, automotive and medical.

Strong points Weak points
  • Identical to that of LDPE
  • Transparency
  • Good shock resistance
  • Identical to PPH

Plastic Materials : Polystyrene Crystal – PS

PS is a transparent thermoplastic with an amorphous structure. It is particularly used for disposable crockery, decorative elements, economic gait …

Strong points Weak points
  • Good rigidity but brittle
  • Beautiful shiny appearance
  • Hard surface of beautiful appearance
  • Reduced cost
  • Poor temperature
  • Brittle
  • Very bad chemical resistance
  • Electrostatic


Plastic Materials : Polystyrene shock – PS shock

Same as PS crystal but opaque and more resistant to shocks.

Plastic Materials : Acrylonitrile-Butabiene-Styrene – ABS

ABS, a thermoplastic from the amorphous family, is one of the most used plastics for appearance parts. It is particularly used in the manufacture of housings, furniture, decoration, automotive.

Strong points Weak points
  • Good scratch resistance
  • Beautiful glossy or satiny appearance
  • Good stiffness and shock resistance
  • Easy marking
  • Good temperature resistance
  • Opaque
  • Bad chemical resistance
  • Electrostatic
  • UV resistance

 

Plastic Materials : Polymethyl methacrylate – PMMA

PMMA is an amorphous thermoplastic. Commonly called Plexiglas, it is appreciated for its very good transparency. Its uses are mainly in the optics, the automobile, the carpentry, the medical.

Strong points Weak points
  • Very good transparency
  • Good UV resistance
  • Brightness and remarkable hardness
  • Good features
  • Fragility
  • Rayable and brittle
  • Limited heat resistance

Plastic Materials : Polyethylene Terephthalate – PET

PET is a transparent semi-crystalline thermoplastic. It is used in many sectors including: water bottles, agri-food packaging, cosmetics, boating.

Strong points Weak points
  • Transparency
  • Mechanical properties
  • Tear resistance
  • Chemical resistance
  • alimentary
  • Low temperature resistance
  • High frequency welding impossible

 

Plastic Materials : Polyamide 6 – PA6

PA6 is a semi-crystalline thermoplastic. Commonly called Nylon, PA6 is used in the technical part requiring good resistance. Thus it is found in the automobile, the mechanical part for industry, photovoltaics.

Strong points Weak points
  • Low coefficient of friction
  • mechanical property Good
  •  thermal resistance Good
  • electrical insulation Good
  • Opacity
  • UV sensitive
  • Dry Fragility
  • Low acid resistance

 

Polyamide 6 loaded 30% glass fibers – PA6 30% FV

PA6 30% FV is a PA6 with glass fiber addition. It has the same characteristics as the PA6 (Nylon) with thanks to its load a better rigidity.

Plastic Materials : Methylene Polyoxide – POM

POM is a thermoplastic of the semi-crystalline family. This material with excellent technical properties has many applications, particularly in the automotive, technical parts for industry, sports …

Strong points Weak points
  • High rigidity and hardness
  • mechanical properties Good
  • resistance to friction Good
  • resistance to hydrocarbons Good
  • Excellent elasticity, spring effect
  • Opacity
  • UV sensitive
  • Combustible

 

Plastic Materials : Polycarbonate – PC

The PC is a transparent thermoplastic of amorphous structure. This plastic is used in particular in the electromechanical, automobile, housings for electronics.

Strong points Weak points
  • Transparent
  • shock resistance Good
  • electrical insulation Good
  • Food plastic
  • resistance to temperature Good
  • Sensitive to cracking
  • Bad resistance to chemicals

Plastic Materials : Elastomeric compounds – SEBS-type TPE – hydrogenated styrenic block copolymer:

Elastomer thermoplastics are available in a multitude of references and hardnesses depending on the application. It replaces in many cases the rubber. These plastics are used in many sectors such as automotive, food, industry, consumer goods …

Strong points Weak points
  • Large extent of hardness from soft to hard
  • mechanical resistance Good
  • resistance to temperature and UV Good
  • Food plastic
  • “Soft touch” effect
  • Overmolding possible on other rigid plastics
  • Opaque
  • Fairly high price
  • Sensitive to tearing

Plastic Materials : Bioplastics based on plant resources

For example PLA – Poly Lactic Acid, which is a thermoplastic resin derived from renewable plant resources and is certified compostable. (from corn, potato …) Application packaging, medical, horticulture, industry …

Strong points Weak points
  • Renewable materials
  • Fairly high price
  • Mechanical properties

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