Seiler Plastics

What Seiler Plastics does

Seiler Plastics Corporation is a family-owned custom plastics manufacturer founded in 1971 and headquartered in St. Louis, Missouri. The company operates two St. Louis facilities and specializes in custom plastic extrusion (profiles, sheet, and tubing), injection molding, and secondary fabrication services including die cutting, hole punching, CNC routing, printing, and light assembly. Its customer base spans industrial manufacturers and original equipment manufacturers (OEMs) across automotive and transportation, medical and healthcare, food and beverage, agriculture and lawn and garden, and industrial and railroad end-markets, with primary emphasis on precision-engineered plastic components produced to customer specifications.

The company's technology stack centers on extrusion lines and injection molding presses ranging from 60 to 450 tons, supported by in-house Solidworks-based engineering for part design, tooling management, and resin selection. Material capabilities span HDPE, LDPE, LLDPE, ABS, Butyrate, flexible PVC, polypropylene, polystyrene, polycarbonate, Santoprene, HIPS, and custom compounds, with Pantone color matching available across product lines. Sheet extrusion covers gauges from 0.0095" to 0.250", while tubing extrusion accommodates outside diameters from 0.0625" to 7.5" in round, triangular, oval, and rectangular profiles. The company emphasizes 24/7 production capacity, 100% U.S.-based manufacturing, and integrated secondary services that consolidate multiple conversion steps under one roof. Quality management includes process controls, inspection and testing, full lot traceability, and continuous improvement programs.

Seiler Plastics generates revenue on a transaction-fee, quote-based model with project-specific pricing—no publicly listed pricing or e-commerce channel. The go-to-market motion is direct inside sales via phone (888-673-4537 and 314-815-3030), email ([email protected]), and website quote request forms, with typical response within one business day. No channel partners, distributor networks, or marketplace distribution are used; all products ship directly from St. Louis. Revenue is not publicly disclosed, and the input material records no funding rounds, acquisitions, partnerships, leadership changes, or regulatory actions—consistent with the company's status as a privately held, family-operated business in continuous operation for over five decades.

Name

Seiler Plastics

Legal name

Seiler Plastics Corporation

Website

https://seilerpc.com

Company type

Private

Founded year

1971

Operating status

Operating

Headcount range

11–50 employees

Short description

Seiler Plastics Corporation is a family-owned, St. Louis-based custom plastics manufacturer founded in 1971, producing extruded profiles, sheet, tubing, and injection molded components for industrial manufacturers and OEMs across automotive, medical, food and beverage, and agricultural end-markets.

Ownership category

akta.pro rank

Product category

Custom Plastic Manufacturing

NAICS

Plastics Pipe, Pipe Fitting, and Unlaminated Profile Shape Manufacturing (32612), Unlaminated Plastics Film and Sheet (except Packaging) Manufacturing (326113), Plastics Product Manufacturing (3261)

SIC

Unsupported Plastics Film & Sheet (3081), Miscellaneous Plastics Products (3080)

akta.pro primary industry

Profile Extrusion (PVC/PE/PP Profiles, Trim, Channels) (IMANACAH)

Keywords

• Custom plastic extrusion
• Injection molding services
• Plastic profile manufacturing
• Plastic sheet extrusion
• Plastic tubing fabrication

Headquarters

HQ city

St Louis

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. Custom Plastic Extrusion Manufacturing: One-time transaction-based revenue from custom extrusion of plastic profiles, sheet, and tubing to customer specifications. Pricing based on material, complexity, volume, and custom requirements.
2. Injection Molding Production: Custom injection molding services from concept through production. Revenue generated per production run with pricing based on machine tonnage, part complexity, resin selection, and volume.
3. Secondary Fabrication Services: Value-added services including die cutting, hole punching, CNC routing, printing, and assembly offered as add-on services to core extrusion and molding capabilities.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

Seiler Plastics Corporation is a family-owned custom plastics manufacturer operating two St. Louis, Missouri facilities since 1971. The company produces custom extruded plastic profiles, sheet (0.0095"–0.250" gauge), and tubing (0.0625"–7.5" OD), along with custom injection molding services (60 to 450 ton machines) and complementary secondary fabrication such as die cutting, hole punching, and CNC routing. Production is 100% U.S.-based with materials spanning HDPE, LDPE, LLDPE, ABS, PVC, polypropylene, polystyrene, and custom compounds with Pantone color matching.

Product overview

Seiler Plastics is a family-owned custom plastics manufacturer offering a unified portfolio of four core manufacturing capabilities: custom plastic extrusion (profiles, sheet, and tubing), injection molding, and secondary services. The extrusion capabilities are offered as distinct product lines—Extruded Plastic Profiles (U-channels, edge guards, trim, snap-fits, complex multi-cavity shapes), Plastic Sheet (0.0095"–0.250" gauge with die cutting, slitting, and CNC routing), and Plastic Tubing (0.0625"–7.5" OD in round, triangular, oval, and rectangular shapes). Injection Molding provides full-service custom molding from 60 to 450 ton machines with in-house engineering, tooling management, and quality systems. Secondary services (Die Cut Services, Hole Punching, CNC Routing) complement the core capabilities to deliver complete solutions under one roof. All capabilities support extensive material ranges including HDPE, LDPE, LLDPE, ABS, PVC, Polypropylene, Polystyrene, Butyrate, and custom compounds with Pantone color matching.

Differentiator

Problem solved

Functional benefit

Products and services

• Extruded Plastic Profiles
• Plastic Sheet
• Plastic Tubing
• Injection Molding
• Die Cut Services
• Hole Punching Services
• CNC Routing Services

Quantifiable outcome

• Quotation delivery within 24 hours
• +3 more outcomes

Segments6 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Scale indicators8 records

Recent moves5 records

Expansion highlights3 records

Direct peers

• NewAge Industries: Custom plastic tubing manufacturer serving fluid transfer, medical, food & beverage, and industrial applications — directly comparable to Seiler's custom tubing extrusion business.
• McClarin Plastics: Integrated custom plastics manufacturer offering thermoforming, extrusion, fabrication, and assembly to industrial OEMs — comparable one-roof business model serving similar customer types.
• Westlake Plastics: Custom plastic sheet and profile extruder producing engineered thermoplastic materials for industrial and medical applications — comparable product mix to Seiler's sheet and profile extrusion.
• Engineered Profiles: Custom plastic extrusion specialist producing engineered profiles, tubing, and custom shapes for industrial applications — a direct competitor to Seiler's profile extrusion business.
• Pexco: One of the largest custom plastic profile extruders in North America, offering similar custom extrusion services across multiple resin families and serving industrial OEM customers with engineered plastic components.
• Crescent Industries: Custom injection molder offering in-house engineering, tooling, and secondary services to industrial OEMs — directly comparable to Seiler's injection molding capability with similar scale.
• Plastic Components Inc. Custom plastic components manufacturer offering extrusion and molding services with secondary fabrication for industrial OEMs — closely comparable in capability mix and customer profile.
• Adam Industries: Mid-sized custom plastic extrusion company producing profiles and tubing for industrial applications — comparable in scale and product focus to Seiler's profile/tubing business.

Broad incumbents

• Westlake Corporation: Large, publicly traded chemicals and plastics manufacturer with broad exposure to PVC, polyethylene, and fabricated plastic products — a much larger competitor that operates in adjacent plastics manufacturing categories.
• Tekni-Plex: Global manufacturer of plastic packaging, tubing, and specialty materials serving medical, food, and industrial markets — a broader incumbent whose tubing and packaging product lines overlap with Seiler's offering.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/SeilerPC
• Facebookfacebook.com/SeilerPlastics

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Seiler Plastics