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Fast. Clean. Precise. 

  • Precision Plastic Machining
  • Rapid Prototype Manufacturing
  • Material Selection Expertise
  • Application Development

Since 1969, we've been a California based plastic manufacturer specialized in Precision Fabrication, CNC Machining, Injection Molding, Die Cutting, Rapid Prototyping, and Clean Room Assembly of plastic and non-metallic components.

Our highly experienced staff of machinists, quality personnel, and supervisors is dedicated to delivering the best quality plastic and non-metallic components in the industry. We're an AS9100 certified company who have enjoyed success over the years as a result of our commitment to quality, integrity, and excellence for every customer.

Roncelli Plastics Facility (afternoon)-387096-edited.jpg

Monrovia, CA (HQ)

Roncelli Plastics San Jose Office.jpg

San Jose, CA

Roncelli Plastics Dallas Office-002384-edited.jpg

Dallas, TX

AS9100D_ISO9001-2015 9Y931-AS12 Certificate

AS9100D with ISO 9001:2015

ISO3485_2016 Certificate

ISO 13485:2016

ISO27001-2013 Certificate

ISO 27001:2013