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About Us

History of the Company

Since the doors opened in 1969, Roncelli Plastics’ mission has been to provide exceptional customer service alongside precision production of plastic components in critical industries. Over the years Roncelli Plastics has expanded on pace with our trusted partners, providing support for organizations ranging from fortune 100 corporations, to early stage hyper growth startups.

Committed to investing in the most efficient manufacturing technologies and outstanding people, Roncelli Plastics empowers an atmosphere of accountability, reliability, and dependability, where open communication and teamwork translates to customer success. Roncelli Plastics' diverse team of experienced engineers, machinists, inspectors, supervisors, and managers are dedicated to the pursuit of Roncelli Plastics' core values:

  • Safety First, Always
  • Great Origination, Seamless Handoffs and Zero Defects
  • Accountability, Responsibility and Extreme Ownership
  • Continuous Improvement
  • Respectful, Professional, Friendly, and Open Door Culture
  • Excellent Service Through Integrity and Open and Honest Communication
  • Team Photo Vintage Magnolia.jpg
  • Roncelli Plastics Original Building
  • Team Photo VIntage 330 building.jpg
  • Roncelli Plastics Leadership team
  • Roncelli Plastics Facility.jpg

Customer Quality Awards

Roncelli Plastics has been honored by various customers for our commitment to quality. These recognitions include:

  • Boeing Preferred Supplier Inspection Delegation
  • Boeing Small Business of the Year
  • Boeing Performance Excellence Award
  • Emerson Rosemount Dock to Stock Certified
  • Raytheon Preferred Supplier
  • UTC Interiors & Propulsion Dock to Stock Certified

Company Culture


Roncelli Plastics seeks to attract, retain, and reward the very brightest minds in the industry by providing a safe, friendly, and supportive work environment where management not only recognizes employees who exceed expectations, but rewards them for their commitment to excellence. For 50 years Roncelli Plastics has invested in its employees' development to improve their individual contributions and provide opportunities for career advancement.

Education Development

Roncelli Plastics supports the continued education of all employees. The company offers paid courses and partial reimbursement for job related classes.

Company Events

Company-wide quarterly reviews with catered lunch. Holiday parties and gift-giving including Thanksgiving Turkey or Ham giveaways.

  • 2018 Class Participants with featured certifications
  • Company Lunches
  • First Aid & CPR Classes
  • CPR Training

Community Sponsorship

It has been a tradition at Roncelli Plastics to support organizations making a difference in the communities where we work and live.

  • Our employee giving program supports Children's Hospital Los Angeles, a top ranked pediatric healthcare facility serving children locally and abroad.
  • Boys & Girls Clubs of the Foothills; provides educational empowerment classes, career development and mentor ship.  We're currently supporting their STEM education programs.
  • Villa Esperanza, an organization serves intellectually/developmentally disabled individuals and their families.     
  • Five Acres, provides health and well being programs to children in the Los Angeles area and surrounding communities.