PEX plastic

Polyethylene Terephthalate (PET)

Cost-Efficient and Lightweight for PET Injection Molding Manufacturers

PET was first polymerized for use as textile fibers known as polyester. Today, PET injection molding manufacturers utilize the material to produce strong, lightweight packing.

A member of the polyester family, PET is the synthesis of ethylene glycol and terephthalic acid. The addition of glycol produces PETG, widely used by PET injection molding manufacturers in plastic injection molded bottles and containers.

Consumers commonly find PET as the material used in plastic jars, convenience packaging and plastic bottles, including those used for carbonated beverages. In the 60 years since it was first introduced, PET has become one of the most widely used and most sustainable plastic materials in the world.

Characteristics

PET’s popularity among PET injection molding manufacturers and their customers is a result of the availability of the materials and relatively low cost. In addition, PET is:

  • Strong for its weight
  • Naturally transparent
  • Resistant to moisture, alcohol and solvents
  • Dimensionally stable
  • Impact-resistant
  • Semi-rigid to rigid, depending on processing
  • Designated food safe
  • Recyclable with a unique resin identification code of “1”

Industries and Applications

Food, beverage and consumer products industries rely on PET for many of their packaging needs. Among the common applications are:

  • Convenience-sized soft drinks, juices and water
  • Single-serving and 2-liter bottles of carbonated soft drinks and water
  • Packaging for foods, such as salad dressings, peanut butter and cooking oils
  • Health and beauty containers for products, including mouthwash, shampoo and liquid hand soap
  • Take-home food containers and prepared food trays

PETG

Although it looks and feels like PET, PETG (or copolyesters) is a modified PET, produced by adding a second glycol during polymerization. PETG removes the hazing that can impact PET and reduces the crystalline effect that can cause PET to become brittle. PET plastic injection molding machines can use PETG to produce bottles that are softer and more pliable for a more comfortable grip. PETG offers clarity, toughness and stiffness and is used in medical test tubes and bottles, lighting fixtures and appliances. The material’s benefits come with a higher cost than the cost of PET.

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