Gaskets and Seals Rubber Gasket Materials and Types of Sealing Options

author: Qishine Industry

2023-05-16

One-Minute Overview

Rubber gaskets come in neoprene, silicone, EPDM, nitrile, and Viton compounds.
Pick the compound by temperature, pressure, media, and flange design.
Neoprene resists oil and weather; EPDM handles steam, hot water, and ozone.
Rubber gaskets are low-cost and dampen vibration and noise.

Gaskets and Seals: An Introduction

Gaskets and seals are used across industries from automotive to aerospace. They create a tight seal between two surfaces and stop the leakage of fluids, gases, and other materials. They come in many materials and types, each with its own properties. Rubber is the most common gasket material, supplied in various compounds and thicknesses, while metal, plastic, and composite gaskets cover other duties. Matching the material and type to the application is what makes the seal last.

Rubber Gasket Materials and Their Benefits

Rubber gaskets seal two surfaces and stop the leakage of liquids and gases, so the compound must match the service. The most common materials each bring distinct strengths:

Neoprene (CR): a synthetic rubber highly resistant to oil, ozone, and weathering, and to many chemicals. Inexpensive and easy to work with, it suits harsh general-purpose service.
Silicone (VMQ): highly resistant to extreme temperatures, so it is chosen where a seal must survive high heat. It also resists many chemicals and is relatively inexpensive.
EPDM: highly resistant to ozone, weathering, and chemicals, and to extreme temperatures. A staple for outdoor and steam or hot-water service.
Viton (FKM): highly resistant to oil, ozone, and chemicals, and to extreme temperatures. Specified for aggressive chemical and fuel duty.

Choosing the correct compound matters: the wrong material fails early, while the right one gives a reliable seal for the life of the joint.

How to Choose the Right Gasket and Seal for Your Application

When selecting a gasket or seal, start with the environment. The first step is the operating temperature range. Above roughly 100°C, materials such as graphite, PTFE, or ceramic may outperform rubber or cork. Next is the pressure range, since high-pressure joints often need a metal gasket. Then the media: oil, water, or chemicals each favor a different material, so a PTFE or Viton gasket may beat rubber in a chemical line. Finally, check the design requirements, such as the need for a flange face or a specific bolt pattern. Weighing temperature, pressure, media, and design lets you choose a gasket that installs cleanly and performs long-term.

Benefits of Rubber Gaskets and Seals in Industrial Applications

Round rubber gaskets and seals are used across industry because they improve safety, raise efficiency, and cut cost. A tight seal prevents the leakage of hazardous materials, lowering the risk of accidents, injuries, and environmental contamination. A good seal also reduces the energy machinery needs, trimming energy costs. Because the seal limits material loss and rework, it lowers material and labor cost as well. For these reasons rubber gaskets and seals remain an essential part of many industrial operations.

FAQ

What are the most common rubber gasket materials?

EPDM, neoprene, nitrile, silicone, and Viton are the most widely used rubber gasket compounds.

What types of sealing options are available for gaskets?

Compression, heat (fusion), and chemical sealing. Compression applies pressure to the gasket, heat fuses the surfaces, and a chemical agent cures the joint.