True Seals

NORTHWEST'S GASKET COMPANY

Over 100 years of combined
local manufacturing
experience...
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Over 100 years of combined
local manufacturing
experience...
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Over 100 years of combined
local manufacturing
experience...
Third slide
Over 100 years of combined
local manufacturing
experience...
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Over 100 years of combined
local manufacturing
experience...
Fith slide
Over 100 years of combined
local manufacturing
experience...
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Contact Us!

The Pacific Northwest's Premiere Source for PORON® Industrial Polyurethanes!

What is PORON® foam?

PORON® is a microcellular polyurethane foam that is designed with an open cell structure, allowing it to have greater resilience and longevity, even after multiple impacts. PORON® polyurethanes provide durable, long term performance in gasketing and sealing as well as cushioning and vibration reduction. This material provides an excellent seal that won’t break down with extended use. PORON® foam can replace silicone in many applications and is less expensive. PORON® comes in a variety of colors and can be easily die-cut or water-jet cut and cuts cleanly providing a pleasing appearance that is ideal for applying adhesives to because there is no need for surface preparation.

PORON® foam was used for sealing gaps in the Hubble Space Telescope and is also used to provide cushioning in applications that protect electronics from impact damage. The broad range of PORON® materials covers application needs ranging from very soft to very firm, as well as specialized performance offerings such as enhanced water sealing and impact protection.

These are just some of the characteristics of PORON®:

  •  Excellent compression set resistance which enables durable, long-term performance for gasketing, sealing and cushioning.
  • Low-outgassing and non-fogging, containing no plasticizers or residual chemicals to contaminate the device. PORON® foam will not become brittle and crumble and is non-corrosive.
  • Easy to fabricate, die-cuts cleanly and works with a broad range of adhesives.
  • Broad range of formulas and thicknesses from 0.012″ to 0.500″ (0.43mm to 12.7mm)
  • Inherently flame retardant without the use of additives. Many of the materials meet flammability requirements of UL HBF and MVSS 302.
  • Engineered urethane formulations offering a wide modulus range -2-90 psi 25% deflection- for more design versatility requirements.
  • Good chemical resistance
  • Improved ability to provide a water tight seal

We Stock PORON® & ship Cut Lengths or Rolls!

There are a variety of PORON® foam materials available to choose from that suit a great number of applications ranging from to waterproofing to sealing and gasketing that can work well as a sealant for aircraft and automotive parts.

Here are a few of the types of PORON® that we have ready for shipment today:


PORON 4701-30: A very soft polyurethane foam; ideal in applications where flexibility is the main requirement. This foam maintains its integrity and effectiveness in gap filling, gasketing, and vibration isolation applications.

PORON 4701-40: Another soft foam, this one is the perfect fit for gasket design. This material provides a broad range of compression performance in a variety of applications; automotive, portable electronics, aerospace and more!

True Seals is proud to be a converter of the PORON® line of polyurethane foams and is your Pacific Northwest home for all of your PORON® gasketing and sealing needs. If you’re interested in learning more about PORON® foam and what it can do, reach out to us today to learn more and we’ll help you choose the right PORON® product for your application.

Do you have any additional questions or concerns about PORON®? Do you need a price quote? Contact us today!

PORON® is a registered trademark of Rogers Corporation.