Square Section Orings OP

Square section Orings look like regular Orings at first glance, but their cross-section is typically square or rectangular. Let’s explore how they differ from standard seals and what their applications are. They are used in hydraulic drives and controls. They serve for both static and dynamic connections of parts in machinery. The basic sealing rings are circular Orings, while square Orings serve as an alternative to circular rings.

Types of Rubber Compounds for Square and Rectangular Orings

Square, rectangular, and circular Orings are made from various types of thermoplastic materials (elastomers) such as:

• NBR

• VITON®

• EPDM

• SILICONE

• SBR

Depending on the operating conditions, the appropriate rubber compound should be selected.

Square Orings Made of NBR Compound

Square Orings made of NBR are the most cost-effective sealing solution. They work at temperatures from -30°C to +100°C, with short-term resistance up to 120°C. They are resistant to products such as:

• Lubricants

• Hydraulic fluids

• Aliphatic hydrocarbons

• Propane

• Butane

• Gasoline

• Alcohols

• Aqueous salt solutions

• Diluted acids and bases at lower temperatures

• Water up to 100°C

However, they also have some weaknesses, including low resistance to:

• Silicone oils and greases

• Glycol-based brake fluids

• HFD-type hydraulic fluids

• Concentrated acids and alkalis

• Aromatic and chlorinated hydrocarbons

• Esters

Square Orings Made of EPDM Compound

Square Orings made of EPDM are used at temperatures from -50°C to +150°C. They offer high resistance to various chemicals, atmospheric factors, and ozone. They are also good electrical insulators. EPDM Orings are recommended for water installations and automotive hydraulics. This compound is also resistant to:

• Hot water and steam

• Acid and alkali solutions

• Soap solutions and detergents

• Fire-resistant hydraulic fluids (HSC, HSD)

• Glycol-based brake fluids

However, their use is not recommended with:

• Mineral oils and greases

• Fuels

FPM/FKM Orings (VITON®)

FPM/FKM Orings, also known as VITON®, feature high thermal and chemical resistance. Due to the presence of fluorine in the FKM/FPM mix, this material is non-flammable. VITON® is primarily resistant to:

• Mineral oils and greases

• Hydrocarbons

• Fire-resistant hydraulic fluids

• Vacuum

• UV radiation

• Ozone O³

• Inorganic acids

However, it has some weaknesses, including low resistance to:

• Concentrated organic acids

• Concentrated sodium hydroxide and acid solutions

• Hot water and steam

Silicone Orings

Silicone Orings, also known as VMQ/MVQ blends, are non-flammable and resistant to high and low temperatures from -60°C to 230°C. They exhibit greater gas permeability at room temperature. Silicone is resistant to:

• Mineral oils and greases

• Diluted salt solutions

• Oxygen

• Alcohols

• Water up to 100°C

• Ozone O³

• Non-flammable hydraulic fluids

Silicone also has some disadvantages, such as low resistance to:

• Concentrated acids and alkalis

• Hydrocarbons

Contact Us

If you need OP rings, feel free to send us a message:

Email: POWER@POWERRubber.com

Phone: +48 505 16 03 03

Address: Pruszków, Domaniewska 5a, near Warsaw