Silicone Heads for Superior Seals

In instances where satisfactory seals have not been achieved with metal heads and silicone holding fixtures or instances where part or machine geometry complicates the use of silicone holding fixtures – Silicone Seal Heads can replace metal heads with a number of key performance advantages.

Thermally conductive silicone materials:


Silicone Seal Heads, used as part of a tooling set along with metal part holding fixtures, provide superior heat sealing performance – reduced leakers!

Our Silicone Seal Heads provide a wide variety of benefits, including:


Highly repeatable Silicone Seal Heads, Custom molding utilizing CNC engraved tools.

Fast Changeovers

Magnetic, quick-change mounting formats, Up to 90 x faster silicone head changeover speeds.

Enhanced Accuracy

Up to 50% improvement in mounting accuracy with magnetic mounting system.


Our team designs patterns to optimize results for each unique application. Patterns are molded directly onto Silicone Seal Heads in multiple reliefs and heights.

Thermal Performance

Heat tolerant up to 550° F, Thermally Conductive, Thermosil® formulation offers very fast heat recovery.

Silicone-to-Metal Bond

Proprietary Process, Unmatched adhesion, No need for adhesives.

Teflon-to-Metal Bond

Alternative to wrapping tools with Teflon tape, Lasts 7x longer, Reduces changeover time while enhancing seal integrity.


At United Silicone, each Silicone Seal Head is carefully crafted to meet the unique needs of each application. We produce flat, contoured and multi-level Silicone Seal heads in both disposable and re-coatable formats for use in our system or competitor systems. We offer three different silicone formulations (in 40-90 durometer Shore A) each specially designed to withstand the temperatures and pressures of the heat seal process.


Character Height (A)

  • .035″ and .065″ relief, standard
  • Custom reliefs available

Silicone Thickness (B)

  • 3/32″ is used for .035″ seal heads
  • 1/8″ is used for .065″ seal heads
  • Custom thickness available

Aluminum Thickness (C)

  • 1/8″ is standard -1/32″, 1/16″, 1/4″ available
  • Deadsoft – Aluminum, easily formed



We would love to create the ideal seal head for your application!

All United Silicone seal heads are made to order at our Lancaster, NY facility. One of our partners at Industrial Specialties Mfg. (our trusted customer service partner for heat seal applications) may follow up to collect information allowing us to more promptly manufacture your pieces.