Grivory HT from EMS-Chemie Holding AG - high-temperature nylon for demanding parts

Reviewed: ad hoc news Classics & Longseller desk. Edited and checked on 2026-06-28, 09:54. Details in the imprint.

Grivory HT from EMS-Chemie sits on the workbench as a dull-grey granulate, then turns into rigid, almost metallic-feeling parts once molded. You can hear the sharp clack when a test engineer snaps a Grivory HT clip into place on an engine cover.

What Grivory HT is made for

Grivory HT is EMS-Chemie’s family of high-temperature polyamides designed specifically for structural parts that run hotter than conventional nylon can handle. The material targets applications where engineers previously reached for aluminum or die-cast zinc.

In practice that means thermostat housings, coolant connectors, charge-air ducts or electronic connector housings that sit next to turbochargers and power modules. The polymer is typically reinforced with 30 to 50 percent glass fibers to deliver a raw, stiff feel in hand.

How it handles heat

One of the defining traits of Grivory HT is its heat-deflection temperature that pushes well beyond 120°C, depending on grade and reinforcement level. That allows components to survive continuous exposure under the hood or near power electronics without softening.

EMS-Chemie’s materials team, led by long-standing CEO and polymer specialist Urs Bolza-Schünemann, positions Grivory HT as a problem solver for downsized turbo engines where plastics face more thermal load than a decade ago.

Processing and surface feel

In the molding shop, Grivory HT needs higher melt and mold temperatures than standard PA6 or PA66, but experienced processors report consistent flow and clean filling of thin ribs once parameters are dialed in. The molten stream looks smooth yet carries visible short glass fibers.

Finished parts in Grivory HT exhibit a tidy, slightly rough surface due to the reinforcement. When you run your fingers over an unpainted connector housing, you feel a robust texture rather than the silky touch of unfilled nylon, which fits the functional character.

Why engineers pick it over metal

For OEMs and Tier 1 suppliers, the motivation to switch from metal to Grivory HT often starts with weight. Replacing a small die-cast bracket or thermostat housing with high-temperature polymer can save dozens of grams per part across hundreds of thousands of units.

Design engineers also gain freedom to integrate clips, seals and cable guides into one molded piece, something harder to do economically in aluminum. That integration helps reduce assembly steps and fasteners, which matters in tightly packed engine bays.

Limits and trade-offs in daily use

Grivory HT does not eliminate all concerns. Designers still need to consider creep under load, long-term exposure to coolant, oil or road salt and the risk of micro-cracking from installation stress. Careful rib design and wall thickness remain essential.

Another sober point for buyers is cost. High-temperature polyamides with heavy glass reinforcement sit well above commodity nylon pricing, which means parts must earn their keep through weight savings, easier assembly or better reliability in the field.

Role in the EMS-Chemie portfolio

Within EMS-Chemie, Grivory HT belongs to the company’s long-established family of specialty engineering plastics, alongside grades for transparent applications and friction-optimized sliding parts. The brand has been present in data sheets and trade fairs for many years.

To wrap up, Grivory HT continues to act as a backbone material for under-the-hood applications and demanding connectors, and EMS-Chemie Holding AG shares (ISIN CH0016440353) are listed on SIX Swiss Exchange with trading in Swiss francs.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.

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