Experts in Silicone Gasket Solutions
Experts in Silicone Gasket Solutions


Chemical Resistant Gaskets

Blue R10490 fluorosilicone sponge pad and solid window gaskets

Stockwell Elastomerics manufactures chemically resistant gaskets using a variety of gasket materials to address compatibility concerns in high tech industries. Engineers require robust gasket solutions for applications in harsher environments.

Stockwell Elastomerics’ Applications Engineers can help eliminate time spent fishing through publications and resources to find the correct chemically resistant gasket material. Stockwell Elastomerics has a variety of resources and industry expert partnerships to get answers on tough chemical compatibility issues. Once a material is selected, Stockwell Elastomerics offers rapid turn samples to help customers iterate through designs and validate material and design choices. When designs are finalized, Stockwell Elastomerics can support production through waterjet cutting, die cutting, molding, or other custom gasket fabrication methods.

What are Chemical Resistant Gasket Materials?

Gasket materials have different levels of chemical resistance, which is the ability to maintain their original properties after exposure to specific chemicals in particular environments. During chemical resistance testing, samples of gasket materials are immersed in various test fluids under different time and temperature conditions. These chemicals and conditions are typically described in test standards through ASTM specifications, but industry-specific and customer-specific test conditions may also exist. Stockwell Elastomerics has access to a variety of industry experts and literature to help customers determine the ideal fit for specific chemical resistant gaskets.

Typically, chemical resistant gasket materials are measured by changes in physical properties (weight, volume, dimensions) or mechanical properties (tensile strength, impact strength, elongation) after a specified immersion time and temperature. The table below describes these materials along with other commonly used rubber compounds. The bolded items in the chart below are some of the high performance materials used by Stockwell Elastomerics that have superior chemical resistance.

General Chemical Resistance

Material Common NameResistant To:Attacked By:
NeopreneModerate chemicals and acids, ozone, oils, fats, greases, many oils, solventsStrong oxidizing acids, esters, ketones, chlorinated, aromatic and nitro hydrocarbons
EPDMAnimal and vegetable oils, ozone, strong and oxidizing chemicalsMineral oils and solvents, aromatic hydrocarbons
Buna-NMany hydrocarbons, fats, oils, greases, hydraulic fluids, chemicalsOzone (except PVC blends), ketones, esters, aldehydes, chlorinated and nitro hydrocarbons
SiliconeModerate or oxidizing chemicals, ozone, concentrated sodium hydroxideMany solvents, oils, concentrated acids, dilute sodium hydroxide
Styrene-butadiene rubber (SBR)Most moderate chemicals (wet or dry), organic acids, alcohols, ketones, aldehydesOzone, strong acids, fats, oils, greases, and most hydrocarbons
FluorosiliconeModerate or oxidizing chemicals, ozone, aromatic chlorinated solvents, basesBrake fluids, hydrazine, ketones
Viton®All aliphatic, aromatic, and halogenated hydrocarbons, acids, animal and vegetable oilsKetones, low molecular weight esters and nitro-containing compounds

Chemical resistance testing is typically quantified in a tiered rating system to show varying levels of chemical interaction. For example, consider an application that may interact with jet fuel (JP-10). In consulting a chemical resistance testing resource, the results are as follows:

Tested ChemicalElastomerResult
Jet Fuel, JP-10SiliconeNR at 70 °F *
Jet Fuel, JP-10FluorosiliconeA to 70 °F **
* >50% volume increase or > 60% tensile strength loss at 100% concentration, or concentrated, or saturated solution at 70 °F. Severe attack
** <15% volume increase or <15% tensile strength loss at 100% concentration or concentrated or saturated solution, to 70 °F. Little or no chemical attack

(Source: Chemical Resistance Guide to Elastomers III, Kenneth M. Pruett, Compass Publications)

Blue R10490 flurosilicone sponge with layers of white RTV between each of 4 layers of sponge As shown above, volume increase and tensile strength changes help describe the chemical resistance. JP-10 has a very severe interaction with silicone, and it is likely that material would fail in use. However, fluorosilicone has little to no reaction, as volume and tensile strength change minimally. This is why fluorosilicone is a great chemical resistant gasket material in the aerospace industry.

Long, black chemically resistant Viton gaskets with waterjet cut holes along the lengthSilicone, fluorosilicone, and Viton® are often chosen as chemical resistant gasket materials due to the benefits outlined in the tables above. Customers in the technology sector often require robust chemical resistance: For example, medical device gaskets need resistance to cleaning agents, just as defense system gaskets require resistance to jet fuels. The chemical resistance of these materials helps ensure a robust and longterm sealing solution, especially when combined with the superior mechanical properties and temperature resistance each of the materials offer

Contact Stockwell Elastomerics for Chemical Resistant Gaskets

Contact Us for further assistance with custom gaskets for applications requiring chemically resistant gasket materials.

Viton™ is a trademark of The Chemours Company FC, LLC.

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