ABOUT PDI
Industrial PVC & CPVC Fabrication Since 1976
Plastic Design Industries fabricates PVC and CPVC duct systems, fittings, and built-to-spec components for the environments where steel corrodes and standard duct fails.
For nearly five decades, engineers, contractors, and facility teams have relied on our material expertise and precision fabrication to move corrosive air and process exhaust — safely, and built to last.
1976
Fabricating since
PVC·CPVC
Material focus
Built-spec
Every assembly
Nationwide
Shipping & support
1976
Fabricating since
PVC·CPVC
Material focus
Built-spec
Every assembly
Nationwide
Shipping & support
Made in USA
Certified
ISO 9001:2015
Certified
I.P.C.A. 620
Certified
Confined Space Entry
Certified team
WHAT WE BUILD
Built Around Industrial PVC Systems
Built Around Industrial PVC Systems
Our product lines are engineered for durability, corrosion resistance, and precise field fit — from standard fittings to complete fabricated assemblies.
Elbows
Reducers
Saddles
Dampers
Blast Gates
Custom fabrication
SINCE
1976
- North Chelmsford, Massachusetts
Decades of Industrial Fabrication Expertise
Decades of Industrial Fabrication Expertise
‘Founded in 1976, Plastic Design Industries (PDI) — formerly Plastic Design Inc. — is dedicated to resolving industrial ventilation and corrosive-environment challenges with innovative, well-engineered PVC and CPVC duct solutions.’
We combine material expertise, advanced welding and machining, and disciplined quality control to deliver systems engineered for performance — and built to last in the field.
New England’s oldest and largest plastic fabrication house.
Plastic Design Industries · est. 1976
~50 yrs
Of continuous thermoplastic fabrication
PVC · CPVC
Dual-material specialization
6"–24"+
Standard duct diameter range
Built-to-spec
Custom assemblies on demand
~50 yrs
Of continuous thermoplastic fabrication
PVC · CPVC
Dual-material specialization
6"–24"+
Standard duct diameter range
Built-to-spec
Custom assemblies on demand
Capabilities
Fabrication & Manufacturing
Our equipment, processes, and skilled fabrication team ensure every system we build meets exacting industrial standards.
PVC & CPVC Welding
Triple-pass hot-gas and extrusion welding for leak-resistant joints rated for continuous industrial service.
CNC Machining
Precision machining of flanges, ports, and custom fabricated components to repeatable tolerances.
Dimensional Consistency
Fittings built to controlled O.D. and wall standards for predictable, accurate field fit-up.
Custom Assemblies
Built-to-spec duct runs, manifolds, and transitions engineered around your application requirements.
Industrial Ventilation Systems
Complete corrosive air-handling and process exhaust systems, fabricated to order.
Engineering Support
Application-driven guidance from material selection through submittal and delivery.
Equipment
Manufacturing & Equipment
A 21,000 sq. ft. floor outfitted with the welding, machining, and testing equipment to fabricate complete thermoplastic systems in-house.
A 21,000 sq. ft. floor outfitted with the welding, machining, and testing equipment to fabricate complete thermoplastic systems in-house.
Design & engineering software
- SolidWorks
- AutoCAD
14 stations
N₂ Welding Stations
Nitrogen-purged hot-gas welding for clean, high-strength thermoplastic joints.
2 centers
CNC Machining Centers
Precision machining of flanges, ports, and custom components to repeatable tolerances.
400 watt
CO₂ Laser
Accurate cutting and detailing of sheet and component stock.
Custom Assemblies
Built-to-spec duct runs, manifolds, and transitions engineered around your application requirements.
Pipe Fusion Equipment
Fusion joining for leak-resistant pipe and duct runs across diameters.
DI Water Testing Systems
Deionized-water testing to validate integrity before systems ship.
Compliance
Standards We Build To
Our fabrication processes and systems are built to meet the standards that govern industrial and process environments.
Our fabrication processes and systems are built to meet the standards that govern industrial and process environments.
FM
FM Approvals fire & loss-prevention standards
SEMI
Semiconductor equipment & materials standards
NFPA
National Fire Protection Association codes
OSHA
Workplace safety & health regulations
Engineering & Support
Services Across the Project
From first survey to post-installation support, our engineering team stays with your project end to end.
From first survey to post-installation support, our engineering team stays with your project end to end.
On-Site Surveys
Field assessment of existing conditions, routing, and tie-in points.
System Evaluations
Review of airflow, material fit, and performance for your application.
Pre-Production Engineering
Submittals, drawings, and material selection before fabrication begins.
Post-Production Support
Installation guidance and ongoing support after delivery.
WHERE WE WORK
Industries We Serve
Chemical Processing
Wastewater Treatment
SemiconductorManufacturing
PharmaceuticalTesting
Industrial Ventilation
Manufacturing Plants
Our Footprint
Built In One Facility, Start to Finish
Design, welding, machining, and testing all happen under one roof in North Chelmsford — keeping quality and lead times under our control.
30,000 sq. ft.
Total Facility
Headquarters, fabrication, and operations under one roof.
21,000 sq. ft.
Dedicated Manufacturing Floor
Welding, machining, fusion, and testing space.
Inside PDI
Our Product
Certifications & Trust
Credentials You Can Verify
PDI maintains the certifications and trained-team credentials that industrial buyers, engineers, and inspectors require.
Made in USA
Every system is fabricated domestically at our Massachusetts facility.
ISO 9001:2015
ANAB-accredited quality management certification.
I.P.C.A. 620 Certified
Certified to recognized plastic fabrication welding standards.
Confined Space Entry
Trained and certified for safe on-site confined-space work.
