Verified Nov 2026
Metal Stamping
·
Monrovia, California
·
Since 1969
Roncelli Plastics is a precision plastics manufacturer headquartered in Monrovia, California, and was founded in 1969. It employs an estimated 100 to 200 people, with estimated annual revenue of $10 to 50 million, and is privately held. The company machines and molds engineered thermoplastics such as PEEK and ULTEM for customers in automotive, electronics, medical, military-defense, electric-vehicle, and renewable-energy markets. In 2026 the company opened a Roncelli Carbon Systems operation in Henderson, Nevada, adding composite capability to its U.S. footprint.
Roncelli Plastics at a glance
Revenue
$10-50M
Est. band
Employees
100-200
Founded
1969
Headquarters
Monrovia, California
Certifications
AS9100 · ISO 13485 · ISO 9001 · ITAR registered
Industries
Automotive
Electric Vehicles
Electronics
Medical
Military & Defense
Renewable Energy
STABILITY SIGNALS
Established & active
57 years in operation (founded 1969).
Holds AS9100, ISO 13485, ISO 9001, ITAR registered certification(s) per public sources.
Overview
Roncelli Plastics is a precision plastics manufacturer headquartered in Monrovia, California, and was founded in 1969. It employs an estimated 100 to 200 people, with estimated annual revenue of $10 to 50 million, and is privately held. The company machines and molds engineered thermoplastics such as PEEK and ULTEM for customers in automotive, electronics, medical, military-defense, electric-vehicle, and renewable-energy markets. In 2026 the company opened a Roncelli Carbon Systems operation in Henderson, Nevada, adding composite capability to its U.S. footprint.
At a glance
Attribute | Detail |
|---|---|
Founded | 1969 |
Headquarters | Monrovia, California |
Employees | 100-200 |
Revenue | $10-50M (estimated) |
Primary capability | Metal Stamping |
Certifications | AS9100 · ISO 13485 · ISO 9001 · ITAR registered |
What Roncelli Plastics makes
Capabilities include CNC machining, injection molding, welding and assembly, additive manufacturing, and clean room assembly, and the company holds AS9100, ISO 9001, ISO 13485, and ITAR registration.
Products and capabilities described on the company's own site include Semiconductor, Plastic, Composite, CNC Machining, Machining, Assembly, Glass (source: roncelli.com).
Certifications
Roncelli Plastics is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:
AS9100 — roncelli.com.my
ISO 13485 — roncelli.com.my
ISO 9001 — roncelli.com.my
ITAR registered — roncelli.com.my
Latest developments
2026-10-07 — Roncelli Technologies is growing its capabilities, capacity, and reach as manufacturing requirements become more complex (manufacturing-today.com)
2026-07-29 — So excited to welcome Roncelli Technologies to Southern Nevada! Working alongside this team for the last 7 months to bring this to life has been nothing short of energizing and inspiring. From … | Roncelli Technologies (linkedin.com)
2026-07-14 — 🎉 Welcome to Southern Nevada, Roncelli Plastics (Roncelli Carbon Systems)! (linkedin.com)
2026-04-01 — Roncelli Technologies is expanding its U.S. operations with the launch of Roncelli Carbon Systems in Henderson, Nevada. | Roncelli Technologies (linkedin.com)
2026-03-27 — We’re excited to share that Chavers Gasket is now Roncelli Precision Sealing. | Roncelli Precision Sealing (linkedin.com)
Facilities
Roncelli Plastics is headquartered in Monrovia, California. Public sources also reference these locations:
Arcadia, California — linkedin.com
Batu Kawan, Malaysia — roncelli.com.my
Company details
The company is part of the Roncelli Technologies group, which in 2026 renamed Chavers Gasket as Roncelli Precision Sealing. Roncelli Plastics was founded in 1969, has an estimated 100-200 employees, and is headquartered in Monrovia, California. On the LightSource stability read it is rated "Established & active": 57 years in operation (founded 1969). Holds AS9100, ISO 13485, ISO 9001, ITAR registered certification(s) per public sources.
Frequently asked questions
What does Roncelli Plastics make?
Roncelli Plastics is a precision plastics manufacturer headquartered in Monrovia, California, and was founded in 1969. It employs an estimated 100 to 200 people, with estimated annual revenue of $10 to 50 million, and is privately held. The company machines and molds engineered thermoplastics such as PEEK and ULTEM for customers in automotive, electronics, medical, military-defense, electric-vehicle, and renewable-energy markets. In 2026 the company opened a Roncelli Carbon Systems operation in Henderson, Nevada, adding composite capability to its U.S. footprint.
Where is Roncelli Plastics headquartered?
Roncelli Plastics is headquartered in Monrovia, California (330 W Duarte Rd, Monrovia, California, 91016).
When was Roncelli Plastics founded?
Roncelli Plastics was founded in 1969.
How big is Roncelli Plastics?
Roncelli Plastics has an estimated 100-200 employees, with revenue in the $10-50M range (estimated).
What certifications does Roncelli Plastics hold?
Roncelli Plastics lists AS9100 · ISO 13485 · ISO 9001 · ITAR registered on its website. Confirm the certified scope for the specific plant producing your part.
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Last verified Nov 2026. Is this your company? Request a correction.
Location & contact
Phone
+1 626-359-2551
Certification
AS9100 · ISO 13485 · ISO 9001 · ITAR registered
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