Sur-Seal Corporation

What Sur-Seal Corporation does

Sur-Seal Corporation is a precision material converting company founded in 1965 and headquartered in Cincinnati, Ohio, with additional manufacturing and service centers in Charlotte (NC), Grand Rapids (MI), Mexico, and China. The company manufactures custom die-cut, molded, extruded, and laminated components (seals, gaskets, EMI/RFI shielding, thermal interface materials, filtration products, custom tubing, and pressure-sensitive adhesive tapes) for OEM customers in aerospace and defense, medical and healthcare, automotive, industrial manufacturing, electric vehicles and alternative energy, lighting and electrical, and data center infrastructure. Manufacturing is enabled by a broad converting technology stack spanning flatbed and rotary die-cutting, CNC waterjet, router and digital knife cutting, industrial laminating, precision slitting, extrusion, molding, and proprietary laser/optical inspection accurate to 0.002 inches.

The company operates under AS9100, ISO 9001, ISO 13485, IATF 16949, USP Class VI, and NIST 800-171 certifications, with a Class 8 cleanroom for medical production. Sur-Seal holds the highest tier 3M Preferred Converter status, the only such distinction among East Coast converters, providing access to 55,000+ 3M products. Owned brands include Sur-Flex silicone seals, Sur-Sil silicone foam, and Sur-Cool thermal gap pads and flame-retardant thermal materials, complemented by Neograf HiTherm and GrafTech graphite thermal products.

Sur-Seal generates revenue through project-based custom manufacturing contracts with no public pricing, sold via a consultative, engineering-driven B2B sales motion directly to 250+ OEM customers, including 20+ Fortune 500 partners, across 25 countries. Revenue model combines component manufacturing margins with 3M material conversion margin. The company is privately held by Heartwood Partners, which underwrote a documented $24.5 million SEC filing in January 2022 connected to a business combination, and has executed three strategic acquisitions: Mueller (March 2022), Ameritape (August 2023), and Kent Manufacturing (March 2025), to expand geographic, certification, and medical cleanroom capabilities.

Name

Sur-Seal Corporation

Legal name

SUR-SEAL HOLDING, LLC

Website

https://sur-seal.com

Company type

Private

Founded year

1965

Operating status

Operating

Headcount range

101–250 employees

Short description

Sur-Seal Corporation is a precision custom material converter founded in 1965 that manufactures die-cut, molded, extruded, and laminated seals, gaskets, thermal materials, and EMI shielding for 250+ OEM customers across aerospace, medical, automotive, industrial, EV, lighting, and data center verticals.

Ownership category

akta.pro rank

Product category

Precision Material Converting & Custom Industrial Components Manufacturing

NAICS

Converted Paper Product Manufacturing (3222), Other Converted Paper Product Manufacturing (32229), Forging and Stamping (3321), Resin and Synthetic Rubber Manufacturing (32521)

SIC

Fabricated Rubber Products, Nec (3060), Converted Paper & Paperboard Prods (No Contaners/Boxes) (2670), Plastics Products, Nec (3089), Plastic Material, Synth Resin/Rubber, Cellulos (No Glass) (2820)

akta.pro primary industry

Finishing, Converting & Die-Cutting Services (IMALAKAN)

akta.pro secondary industries

Seals, Gaskets & O-Rings (Industrial Elastomer) (IMANALAC), Paperboard Sheet & Roll Converting (Slitting/Sheeting/Rewinding) (IMAMAFAM), Flexible Packaging Converting & Finishing (Slitting, Rewinding, Coating, Embossing) (IMALABAL)

Keywords

• Precision material converting
• Custom die-cutting
• Industrial gaskets and seals
• Thermal management materials
• Medical device components

Headquarters

HQ city

Cincinnati

HQ country

United States

HQ region

North America

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom Manufacturing Services (OEM Component Manufacturing): Sur-Seal generates revenue by manufacturing custom die-cut, molded, extruded, and laminated components for OEM customers. Revenue is project- and order-based, driven by production volume and material complexity. The company serves aerospace, medical, automotive, industrial, EV, and lighting sectors with engineered components. Pricing is quote-driven with no public price list.
2. 3M Preferred Converter / Material Sales: As a 3M Preferred Converter and 3M Preferred Automotive Converter, Sur-Seal converts and resells 3M adhesive tapes, foams, and bonding materials as part of its component manufacturing and supply chain services. This generates revenue from material conversion margins and supply chain services.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

Sur-Seal Corporation is a precision material converting manufacturer that designs and produces custom die-cut, CNC-cut, molded, extruded, and laminated components — including seals, gaskets, thermal interface materials, EMI/RFI shielding, filtration products, pressure-sensitive adhesive tapes, and medical wearable components — for OEM customers in aerospace, medical, automotive, industrial, EV/alternative energy, lighting, and data center markets. The company supports customers from prototyping through production with engineering services, laser inspection, assembly, kitting, warehousing, and distribution, operating as a 3M Preferred Converter with access to over 55,000 3M products.

Product overview

Sur-Seal Corporation is a precision material converting company founded in 1965, offering a comprehensive suite of custom manufacturing services organized around die-cutting, CNC cutting, extrusion, and molding capabilities. The company's core offerings include Custom Die-Cutting Services (flatbed and rotary), CNC Cutting Services (waterjet, router, digital knife), Laminating Services, Precision Slitting Services, and Laser Inspection Services. These production capabilities are complemented by Engineering Services, Custom Assembly & Kitting, Warehousing & Distribution, and Material Sourcing. The company manufactures proprietary branded materials including Sur-Cool Thermal Interface Materials, Sur-Sil Silicone Foam, and Sur-Flex Silicone Seals, alongside custom gaskets, seals, adhesive tapes, EMI/RFI shielding, filtration products, and medical wearable components. The portfolio is delivered through multiple manufacturing facilities across North Carolina, Ohio, Michigan, Mexico, and China, with 3M Preferred Converter status providing access to over 55,000 3M products.

Differentiator

Problem solved

Functional benefit

Brands

• Sur-Cool: Silicone thermal gap pads and thermal interface materials for heat management in aerospace and lighting applications.
• Sur-Sil
• Sur-Flex

Products and services

• Custom Die-Cutting Services Precision die-cutting services using flatbed (up to 78 inches wide) and rotary die-cutting methods to convert materials such as foam, rubber, silicone, films, and adhesives into custom-shaped seals, gaskets, and insulation components for OEM customers.
• CNC Cutting Services Computer numerical control cutting services including waterjet cutting for materials up to 6 inches thick (72" × 120" bed), CNC router cutting (60" × 98" bed), and digital knife cutting up to 2,000 inches per minute, supporting prototypes through production runs.
• Sur-Cool Thermal Interface Materials Proprietary high-performance silicone thermal gap pads and fillers designed to dissipate heat and maintain safe operating temperatures in LED lighting, aerospace, and electronics applications, including the Sur-Cool SFR flame-retardant variant.
• Sur-Sil Silicone Foam Proprietary silicone foam material designed for sealing, cushioning, and thermal management in medical, aerospace, server/data center, and industrial environments requiring temperature resistance and durability.
• Sur-Flex Silicone Seals Proprietary silicone sealing product line for liquid and gas containment applications, available in solid and foam forms and in die-cut, molded, and extruded configurations across industrial, lighting, and electronics use cases.
• Custom Gaskets Precision die-cut gaskets manufactured from rubber, silicone, foam, and other materials for sealing and environmental protection across aerospace, automotive, medical, and industrial applications.
• Custom Seals Custom sealing components designed to protect assemblies from moisture, dust, and environmental exposure, available in rubber, silicone, EPDM, and specialty materials, including Sur-Flex-based configurations.
• Pressure-Sensitive Adhesive Tapes Custom converted adhesive tapes including 3M VHB tapes and pressure-sensitive adhesives for bonding, sealing, and attachment in automotive, aerospace, and industrial applications, leveraging Sur-Seal's 3M Preferred Converter status.
• EMI/RFI Shielding Components Materials engineered to reduce electromagnetic and radio frequency interference in sensitive aerospace, medical, and electronics systems.
• Filtration Products Custom filtration components for air, liquid, and particulate filtration used in industrial, medical, and HVAC applications, including molded enclosure filters and extruded tubing for HVAC cooling.
• Medical Wearable Components Skin-friendly, flexible adhesive components designed for smart patches, biometric sensors, and patient monitoring devices, including biocompatible wound care and skin adhesives manufactured in Class 8 cleanroom conditions.
• Custom Extrusion Services Custom extrusion manufacturing for producing extruded parts including solid or sponge silicone tubing and profiles.
• Custom Molding Services Custom molding services for producing fully customizable rubber and plastic molded parts.
• Laminating Services Industrial laminating services that combine dissimilar substrates like foam, rubber, and films into multi-layer materials, with auto edge guide, heated platen, in-line sheeting/slitting, and multi-layer capability.
• Precision Slitting Services Material slitting services that convert large log rolls into usable widths using lathe slitting for narrow widths and rewind slitting (razor blade, sheet, and score cutting) for long-length rolls of tapes, films, and papers.
• Custom Tubing Solutions Custom tubing manufacturing including thermal formed tubing, PVC tubing, medical tubing, HVAC tubing, pneumatic tubing, and automotive tubing, with options for assembly, tipping, thermal forming, print marking, and stamping.
• Rapid Prototyping Services Die-cut prototyping services using flatbed and rotary methods for 2–6 business day turnaround to verify design and fit before investing in tooling.
• Laser and Optical Inspection Services Precision laser inspection using a proprietary photoelectric sensor system for part counting, code scanning, and surface defect detection with accuracy within 0.002 inches and results within 20 seconds, supporting FAI, PPAP, and SPC reporting.
• Custom Assembly & Kitting Services Assembly services for multi-part seals, adhesive-backed seals, fastener assemblies, and tubing assemblies, plus kitting services that sort and package products into ready-to-use kits for OEM customers.
• Warehousing & Distribution Services Full-service distribution center with strategic locations, stocking programs, customizable packaging, and same-day shipping capabilities supporting OEM customers.
• Engineering Services Engineering support including design and application engineering, process engineering, Value Analysis/Value Engineering (VA/VE), reverse engineering, jig/fixture design, CAD format conversion, and part nesting software.
• HiTherm Graphite Thermal Management Materials Advanced graphite-based thermal management materials (GrafTech HiTherm and Spreadershield) used in high-temperature aerospace and lighting environments for heat dissipation.

Quantifiable outcome

• Rapid prototyping turnaround of 2–6 business days depending on part complexity
• +4 more outcomes

Named customers9 records

Segments7 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Two partnerships are on record, tiered core and minor.

• 3McoreStrategic or Co-development PartnerSur-Seal is a 3M Preferred Converter (the highest attainable tier) and a 3M Preferred Automotive Converter, providing access to over 55,000 3M products, engineering support, and training. The partnership enables custom solutions across industrial, medical, automotive, and aerospace applications. 3M provides materials expertise and co-develops solutions with Sur-Seal for challenging manufacturing applications.
• WireCare (via Sure-Seal Connections)minorGTM or Marketing PartnerSure-Seal Connections (a related entity) partnered with WireCare in May 2026 to expand access to sealed connector technology for customers in powersports, automotive, and motorsports markets. The partnership targets IP67-rated connectors for harsh environment applications. Note: This entity (Sure-Seal Connections) may be a related but distinct entity from Sur-Seal Corporation.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Market position

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@sur-seal2610
• LinkedInlinkedin.com/company/sur-seal-corporation
• Xx.com/surseal
• Facebookfacebook.com/SurSeal

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries3 records

Funding overview

Funding rounds3 records

Investors

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

M&A3 records

Investments

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

Frequently asked questions about Sur-Seal Corporation