Fax: (732) 502-9503 535 Prospect St. Pawtucket, RI 02860
Questions? Call Us: (732) 502-9500
  • Blow Molding
    • About Blow Molding
    • Blow Molding vs. Injection Molding
    • Is Blow Molding Right for Me?
    • Molding Capabilities
  • Custom Products
    • Custom Bellows
    • Specialty Containers
    • Thin Wall Products
    • Unique Hollow Objects
  • Why Flexcraft?
  • Case Studies
    • Not Your Household Freezer Bag
    • The Indestructible Bellows
    • Blood Bank Testing Technology
    • Transfusing New Approaches into Flexcraft Philosophy
  • Contact Us
    • Contact Info
    • Careers
    • Request a White Paper

Blow Molding vs. Injection Molding

Blow molding differs from injection molding in several key ways, and a better understanding of these differences helps avoid production problems.

  • Injection molding makes solid parts, like a Frisbee®, while blow molding makes hollow parts, like a soap dispenser.
  • Blow molding, by its nature, makes parts whose wall thickness will vary from place to place, based on how much the material has to stretch as it is being blown. An injection-molded part’s thickness is determined by the mold and core relationship.
  • With injection molding, making the mold is 90% of the job.  In blow molding, making the mold is only 50% of the job – a host of other variables must be managed closely, such as the type of plastic, the process temperature, the velocity or pressure of the blown air, and the mold close speed.

To learn more about blow molding, read the white paper How to Avoid a Blow Molding Nightmare.

Tel: (732) 502-9500
Fax: (732) 502-9503


Corporate Headquarters

50 Flexcraft Drive
Neptune City, NJ 07753

Pawtucket Facility

535 Prospect St.
Pawtucket, RI 02860

  • Blow Molding
  • Custom Products
  • Why Flexcraft?
  • Case Studies
©2020 Flexcraft, All rights reserved. CONTACT US | TERMS OF USE | CAREERS
  • Blow Molding
    • About Blow Molding
    • Blow Molding vs. Injection Molding
    • Is Blow Molding Right for Me?
    • Molding Capabilities
  • Custom Products
    • Custom Bellows
    • Specialty Containers
    • Thin Wall Products
    • Unique Hollow Objects
  • Why Flexcraft?
  • Case Studies
    • Not Your Household Freezer Bag
    • The Indestructible Bellows
    • Blood Bank Testing Technology
    • Transfusing New Approaches into Flexcraft Philosophy
  • Contact Us
    • Contact Info
    • Careers
    • Request a White Paper