DOT 4B Cylinders / UN Vessels

UN Pressure vessels, UN1A1, DOT cylinders and bubblers

Serving semiconductor, pharma, vacuum industries

PFL now offers Bolt-top and welded cylinders for Applied Materials Tools 5 Valve stack;  2 valve;  3 valve;  custom

- Industry STD cylinders (eg AMAT, LAM, TEL, ASM, Beneq,

   Picosun, Arradiance, Schumacher, UltraTech, others.)

- ALD and MOCVD cylinders 25cc to 100L + Sample cylinders

- 5 gallon, 10 gallon (19L, 33L) UN1A1 

- Class 100 and class 10,000 cleanrooms


- Design, Prototype, Manufacture, Repair, Recertify, Clean

- Level sensors - Heating jackets - Custom Evaporators

- UN Drop Tests and Certification

- Lasermarking and 3D printing


Services:  PFL offers machining and welding services for stainless steel components.  Precision to .0005" and welding for linear and circumferential components up to 20" in diameter.

InternaWeld™ exclusive to PFL, enables the construction and repair of close tolerance components, particularly VCR glands for canisters, bubblers, cylinders and other semiconductor processing equipment. This USA-developed technology delivers a SEMI-compliant, fully penetrated weld on stainless steel alloys, delivered from the inside of the part.   InternaWeld™ permits the refurbishment and recertification of otherwise unredeemable equipment.

PFL is represented at Semicon China, Semicon Japan, ALD International, CS Mantech, Semicon West & other major venues

Career Opportunities:  Seeking...

  • CNC machinist

  • Quality, Test Repair Technician


Stacy Trosper, Quality Manager

Business Operations in Asia.

Bill Caldwell, 858-675-8274            (San Diego, Shanghai + Tokyo)

Yoshi Kuroiwa, +81 474 59 0161    (Tokyo)

Ryan Seo, +82 10-5779-8222          (Seoul Korea)

Product Mix

PFL Product Mix 2016

Download PDF Here

ISO Registered and Certified

Download ISO Certificate Here



PFL had a catastrophic power outage requiring the replacement of power lines from the local utility.  Power was restored today (Friday 11/1) but production was disrupted for 3 days.  Notices will be sent to affected customers and additional personnel and overtime will be employed to minimize the impact on deliveries.

© 2017 by PFL


+1.781.341.7242   |   info@precisionfab.net