Engineered Materials. Advanced Converting.
The converting partner OEMs standardize on — fifty years of engineering-led DFM and production under our ISO 9001:2015 certified QMS, serving OEMs across aerospace, defense, energy, medical, fenestration, and construction programs.
Engineering-led, from first drawing to full-rate production.
Every program moves through the same disciplined process — component design, advanced material manufacturing, and engineering support that stays with you for the life of the part.
Engineered Performance Components
We design and manufacture high-performance material systems for sealing, thermal management, EMI shielding, vibration control, and environmental protection. Our components are engineered to perform in the most demanding industrial, aerospace, medical, and advanced electronics environments.
Advanced Material Manufacturing
From cellular silicone and specialty elastomers to engineered foams, laminates, films, and multi-layer constructions, we convert and fabricate precision components with tight tolerances and repeatable quality. Our processes are built for scalability, traceability, and long-term program support.
Program-Level Engineering Support
We work directly with design engineers and sourcing teams to optimize materials, improve manufacturability, and reduce lifecycle risk. From early-stage development through full production release, H-O operates as an extension of your engineering team.
Industry Application Expertise
H-O Products understands the specific material applications unique to your industry. Select yours below to learn more about engineered product options and recommendations.
HUMANOID ROBOTICS
AEROSPACE & DEFENSE
ELECTROMECHANICAL AND SWITCHGEAR
ELECTRONICS AND IoT
ENERGY
EV AND BATTERY
FENESTRATION
GENERAL CONSTRUCTION
Industrial HVAC
Medical
TELECOM & DATA CENTERS
Five jobs inside the enclosure, one converter
Whatever the industry above, the hard problems come down to five: shielding interference, moving heat, sealing the enclosure, isolating voltage, and bonding it all together. H-O die-cuts and laminates the materials that solve them, in-house in Winsted, CT, since 1971.
EMI / RFI Shielding
Precision die-cut gaskets, fabric-over-foam, and foil tapes that keep electromagnetic and radio-frequency interference (EMI/RFI) where it belongs.
Thermal Management
Die-cut and laminated thermal interface pads and gap fillers that pull heat off power semiconductors and out of the enclosure.
Environmental Sealing
Die-cut silicone-foam and elastomer gaskets that seal enclosures against dust, moisture, and air across NEMA and IP ratings.
Electrical Insulation
Die-cut aramid papers, polyimide and polyester films, and mica that isolate voltage in motors, transformers, and drives.
Bonding & Attachment
Die-cut acrylic foam tapes, transfer adhesives, and laminated pressure-sensitive constructions that bond panels, trim, and hardware without fasteners.
Not sure which material fits your spec? Talk to an engineer →
Spacecraft & Launch Vehicle Expertise
From the launch pad to orbit, H-O Products converts the materials flight programs rely on: low-outgassing cushioning screened to ASTM E595, cryogenic insulation, and EMI shielding, die-cut in Winsted, CT.
Cryogenic & Space Systems Insulation
Die-cut aerogel blankets, feedline wraps, and MLI support layers for cryogenic propellant service and space thermal control.
Learn More »EMI Shielding for Aerospace & Defense
Conductive silicones and fluorosilicones per MIL-DTL-83528, Types A through M, for avionics, defense electronics, and orbital hardware.
Learn More »Aerospace, Defense & Space
Eighteen aerospace applications, one converter: thermal insulation, sealing, vibration isolation, bonding, and FST-compliant materials.
Learn More »News & Insights
Technical guides and standards notes from the H-O engineering team.
Data Center Liquid Cooling Gaskets, Seals and TIM: Material Selection by Zone (EPDM, Fluorosilicone, FKM, FFKM)
EPDM vs fluorosilicone vs FKM vs FFKM for data center liquid cooling: which gasket, seal, insulation and TIM materials go on each side of the CDU, with ASHRAE TC 9.9 context and a compatibility table.
Inside a BESS: The Materials That Keep Battery Storage Safe
What a battery energy storage system is, whether they are safe, and a zone-by-zone tour of the die-cut fire barriers, thermal interface materials, EMI gaskets, insulation and vents working inside the enclosure.
New BESS Fire Rules: What UL 9540A’s 6th Edition and NFPA 855-2026 Change for Your Material Stack
UL 9540A’s 6th Edition (March 2026) adds large-scale fire testing and NFPA 855-2026 makes hazard mitigation analysis mandatory. What both changes mean for the passive material stack inside a battery energy storage enclosure.