Materials · Industrial plastics
Polypropylene machining
Custom polypropylene parts CNC machined to your drawing or sample: manifolds, baffles, tank fittings, housings and more. Machined in our Aurora, Illinois shop.
Polypropylene at a glance
- Full name
- Polypropylene (PP)
- Also called
- PP, PPH (homopolymer), PPC (copolymer)
- Known for
- Broad chemical resistance at a low cost
- Common in
- Chemical processing, plating, water treatment and lab equipment
- Forms
- Homopolymer and copolymer; natural, gray and colored
Parts in polypropylene
Polypropylene parts we machine
The parts we see most often in polypropylene, and why it suits each job. We machine any polypropylene part to your drawing or sample, listed here or not.
- Manifolds photo
Manifolds
Manifolds for chemical dosing and water treatment, at a sensible cost.
- Baffles photo
Baffles
Baffles for tanks and wet-process equipment.
- Sealing caps photo
Sealing caps
Threaded caps and plugs for chemical and water service.
- Housings photo
Housings
Housings and enclosures for wet and chemical areas.
- Gaskets photo
Gaskets
Economical gaskets for water and process service.
- Tank and wet-bench parts photo
Tank and wet-bench parts
Flanges, fittings and racks for plating, anodizing and wet benches.
Need a different polypropylene part? Send the drawing, or the old part, and we’ll quote it. Request a quote
Is polypropylene right for the part?
Where polypropylene works, and where another plastic may suit
General guidance on how polypropylene behaves. If your drawing specifies a polypropylene grade, we machine to it.
Where it works
- Chemicals
- Resists most acids, alkalis and salt solutions.
- Water
- Takes on almost no water, so it holds its size in wet service.
- Weight
- One of the lightest plastics. It floats on water.
- Cost
- One of the lowest-cost plastics for chemical service.
- Fatigue
- Takes repeated flexing without cracking.
Where another plastic may suit
| If the part needs | Often used instead |
|---|---|
| Strong solvents and oxidizers Some solvents and strong oxidizing acids attack polypropylene. These resist far more chemicals. | |
| Higher heat Polypropylene softens at moderate temperatures. These keep their shape hotter. | |
| Cold and impact Homopolymer polypropylene grows brittle near freezing. These stay tough in the cold. | |
| Stiffness and close fits Polypropylene is soft and flexes under load. These are stiffer and hold closer fits. |
Grades
Polypropylene grades
Polypropylene comes as homopolymer or copolymer, natural, gray or colored, with flame-retardant, glass-filled and food-grade options. Name the grade on your drawing, or tell us how the part is used and we’ll suggest one.
| Grade | Typically used for |
|---|---|
| Homopolymer | General chemical-service parts. |
| Copolymer | Parts that get handled. Tougher, including in the cold. |
| Flame-retardant | Wet benches and equipment with fire requirements. |
| Glass-filled | Stiffer parts that carry load. |
| Food-grade | Food and beverage equipment. |
Buyer questions
Polypropylene FAQs
Something else? Call (630) 904-2525.
All plastics we machineHomopolymer is stiffer and is the usual choice for chemical-service parts. Copolymer is tougher, especially in the cold, so it suits parts that get handled or knocked. If your drawing specifies one, we machine to it.
Both resist a wide range of chemicals and take on almost no water. Polypropylene is stiffer and handles more heat. HDPE stays tougher in the cold. We machine both, and we’ll suggest suitable plastics for the part.
Yes. We machine polypropylene racks, fittings, baffles and covers for plating, anodizing and other wet-process equipment, to your drawing or sample. If your spec specifies a grade, we machine to it.
Yes. We supply polypropylene sheet and rod, cut to size when you need it, through our material supply service.