O-RING   

Contact Us For Assistance Or SamplesClick Here and contact us today to receive a free quote or if you have any questions regarding sizing.  O-Ring Groove Design Extrusion Limits  

An o-ring is contained in a gland and forced to flow into the surface imperfections of the glands and any clearance gaps available to it.

An o-ring can perform sealing by means of squeeze under low pressure conditions. The extent of extrusion depends upon the hardness of O-ring, the pressure, and the size of the clearance gap.

 

  O-Ring Size & Dimension Charts  

There are two main o-ring sizing types: standard and metric. Standard was developed for use in the United States, while the international community uses -metric sizes. The metric sizes are further broken down by region, notably Europe and Japan.

 

Learn more about O-Ring sizes using the links below to explore their dimensions in an interactive chart.

• Standard AS-568B

• Japanese Metric O-Rings (JIS)

• European Metric O-Rings (DIN)

Seal & Design has all these sizes and more. We can provide virtually any required size.

 

  We Supply This Standard Oring  

● AS 568A USA	● BS 4518 England	● DIN 3771 Germany	● SMS 1586 Sweden
● AFNOR 47501 France	● JIS B2401 Japan	● JASO F404 Japan	● ISO 3601 International

 

  Service Guarantee  

• Perfect logistics system and SAP system to provide customers with accurate service guarantee;

• Guaranteed shortest delivery time based on stock.

 

  PTFE Coated O-Rings  

Coated o-rings typically have a thin film of PTFE (a generic compound of Teflon™, a trademark of the Chemours Company), commonly termed a “coating” which is adhered to the o-ring. The PTFE external treatments can be dry or wet coatings or dips. 

Another possible coating is poly(p-xylylene) polymers (trademark name: Parylene). These polymers are chemically vapor deposited. These coatings take place through a vacuum deposition where the polymer or Parylene condenses on the o-rings surface in a polycrystalline fashion. 

 

  Reasons For Coated O-Rings  

The most common reasons for using a specific coating to enhance the performance characteristics of an o-ring or a seal include friction reduction, ease of installation and contrasting color for ease of identification, and increased wear life for less downtime. A coated o-ring or seal is free from dirt and debris because you don’t need to use oil-based lubricants and it can reduce and/or prevent damage from automated equipment.

 

  PTFE Coated O-Ring Color Options  

The most common color for PTFE coated o-rings is blue.Coatings are available in a wide variety of colors that can include light, medium and dark blue, black, purple, pink, red, orange, yellow, brown, light, medium and dark green and clear. 

O-rings made from Buna (Nitrile°) and Viton® are the most common elastomers that are coated with PTFE to meet application requirements.

 

DESIOR carry a variety of standard o-ring sizes and colors. Contact us today to learn more.

 

  O-Ring Specifications  

• Wide range of sizes, IDs and ODs

• Buna, FKM, EPR, Silicone, PTFE, PTFE encapsulated, PTFE coated, Kalrez, Neoprene, Chemraz, Simriz, Highly Saturated Nitrile, Urethane, Mil-spec, and many specialty compounds

• Quantities from small orders to large production, quantity orders

• Custom kitting, assemblies, and splicing kits

 

 Standard O Rings Colors 

Special order O-rings and seals in different colors are increasingly popular with OEMs for parts identification and are priceless if assembly or repair mistakes are avoided.  Please call DESIOR for specific information (lead times, minimums) about both custom colors and stock colors for your production or private labeled repair kits.

 

 We Have Experience in All Industries, Including, 

● original equipment manufacturers (OEM)	● aerospace	● military	● water treatment
● wastewater	● filtration	● medical and life sciences	● oil and gas
● power generation	● chemical processing

 

 Standard O Rings For Oem & Mro Markets 

We serve the OEM and MRO markets, providing facilities and maintenance managers with replacement and wear parts, providing custom or standard O-Rings for existing product production and new product development. Our expert team can recommend and source the right O-Ring for your application.

O-Rings provide seals between two or more parts in equipment, machinery, and motors. They are used to prevent leakage of liquids or gasses and to provide protection against compression or wear in moving parts.

We can provide O-Rings with material and manufacturing processes certifications to industry standards if required for your application. If your application requires unique or hard-to-find sizes, shapes, or materials, we will work with our manufacturing partners to source the O-Rings you need. At Rocket Seals, our commitment to the highest standard of customer service includes technical support to assist you in selecting the O-Ring that will meet your application requirements.

DESIOR Seals is a leading seal and O-Rings specialist, supplying standard O-Rings for all industrial applications.  For over 60 years, we have serviced the growing and changing needs of industry, sourcing from leading manufacturers to update and expand our inventory to provide O-Rings that meet your latest requirements.  We partner with our customers – providing you with technical expertise and superior service to ensure that your purchases meet or exceed your expectations.  DESIOR Seals is a full-line stocking distributor serving the OEM and MRO markets.  We take pride in our same-day shipping, and our ability to provide the right part, on-time and as promised.

MATERIAL LIST

 

 Benefits Of Nbr (or Nitrile) O-rings 

•　NBR (or Nitrile) material is great for all but the most extreme applications.

•　It works from -40-degrees F to 250-degrees F, and has good wear resistance.

•　It works with oils but does not work with brake fluid, ketones, and some hydraulic fluids.

 

 Not Recommend for 

It is not resistant to weathering, sunlight, and ozone unless a special compound is used.

Names: NBR/Nitrile

 

 Chemical Resistance 

Aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oil and grease, diesel fuel, fuel oils) vegetable and mineral oils and greases

HFA, HFB, and HFC fluids

Dilute acids, alkali and salt solutions at low temps.

Water (special compounds up to 212°F (100℃)

 

 Not Compatible 

Fuels of high aromatic content (for flex fuels a special compound must be used)

Aromatic hydrocarbons (benzene)

Chlorinated hydrocarbons (trichloroethylene)

Polar solvents (ketones, esters, ethers, acetones)

Strong acids

Glycol based brake fluids

Ozone, weather, and atmospheric aging

Disclaimer: These are general guidelines only. All materials should be tested in your application.

 

 Fkm (or Fluorocarbon) & Knowns As Viton Recommended For  

•　FKM (or Fluorocarbon) also known as Viton™, a registered trademark of The Chemours Company, works for almost every application.

•　It can withstand temperatures from -25-degrees F up to 400-degrees F.

•　It has a good resistance to ozone, high temperatures, oxygen, mineral oil, synthetic hydraulic fluids, fuels, aromatics and many organic solvents and chemicals.

 

 Chemical Resistance 

Mineral oil and grease, low swelling in ASTM oil No. 1, and IRM 902 and IRM 903 oils　

Phosphate esters

Non-flammable hydraulic fuels in the group HFDEngine oils Silicone oil and grease　

Mineral/vegetable oil and grease

Aliphatic hydrocarbons (fuel, butane, propane, natural gas)

Aromatic hydrocarbons (benzene, toluene)

Chlorinated hydrocarbons (trichlorethylene and carbon tetrachloride)

Fuels, also fuels with methanol content

 

 Not Compatible 

Glycol based brake fluids, Ammonia gas amines, alkalis, Superheated steam, Low molecular organic acids (fomic and acetic acids)

Disclaimer: These are general guidelines only. All materials should be tested in your application.

 

 Neoprene (cr) Synthetic Rubber 

Neoprene was the first synthetic rubber developed commercially and exhibits generally good ozone, aging and chemical resistance. It has good mechanical properties over a wide temperature range. Improved ozone, weathering and aging resistance compared with nitrile rubber.

Both o-rings and gaskets can be made from Neoprene materials.

 

 Chemical Resistance 

Paraffin base mineral oil with low DPI, e.g. ASTM oil No.1

Silicone oil and grease

Silicone oil and grease

Refrigerants

Ammonia

Carbon dioxide

 

 Limited Compatibility 

Naphthalene based mineral oil (IRM 902 and IRM 903 oils)

Low molecule aliphatic hydrocarbons (propane, butane, fuel)

Glycol based brake fluids

 

 Not Compatible 

Aromatic hydrocarbons (benzene)

Chlorinated hydrocarbons (trichloroethylene)

Disclaimer: These are general guidelines only. All materials should be tested in your application.

 

 Silicone O-Rings Are Recommended For  

•　Silicone has a very wide temperature range from -100-degrees F to 450-degrees F.

•　It works as an insulator

•　Resistant to ozone and weather.

 Not Recommended for 

• It has a low tensile

• Tear and wears resistance

• Dynamic applications.

 

 Chemical Resistance 

Engine and transmission oil (e.g. ASTM oil No.1)

Animal and vegetable oil and grease

Brake fluid (non-petroleum base)

Fire-resistant hydraulic fluid, HFD-R and HFD-S

High molecular weight chlorinated aromatic hydrocarbons (including flame-resistant insulators, and coolant for transformers)

Moderate water resistance

Diluted salt solutions

Ozone, aging, and weather resistant

 Not Compatible 

Superheated water / steam over 250°F(121℃)

Acids and alkalis

Low molecular weight chlorinated hydrocarbons (trichloroethylene)

Aromatic mineral oil

Hydrocarbon based fuels

Aromatic hydrocarbons (benzene, toluene)

Disclaimer: These are general guidelines only. All materials should be tested in your application.

 Hydrogenated Nitrile Butadiene Rubber - Hnbr 

HNBR is made via selective hydrogenation of the NBR butadiene groups which improves the temperature and ozone resistance considerably. HNBR is widely known for its physical strength and retention of properties after long-term exposure to heat, oil, and chemicals. HNBR has better heat resistance; oxidation resistance; tensile strength and abrasion resistance than standard nitrile (NBR). Also an excellent choice for automotive refrigerant service.
Both o-rings and gaskets can be made from Nitrile materials.

Names: Hydrogenated Nitrile, HNBR, HSN

 

 Chemical Resistance 

Aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oil and grease, diesel fuel, fuel oils) vegetable and mineral oils and greases 
Silicone Oils

Automatic Transmission Fluid

Automotive refrigerants

HFA, HFB, and HFC fluids

Dilute acids, alkali and salt solutions at low temperatures

 

 Not Compatible 

Fuels of high aromatic content

Aromatic hydrocarbons (benzene)

Chlorinated hydrocarbons (trichloroethylene)

Polar solvents (ketones, esters, ethers, acetones)

Strong acids

Glycol based brake fluids

Ozone, weather, and atmospheric aging

Disclaimer: These are general guidelines only. All materials should be tested in your application.

 

 Fluorosilicone O-Rings 

Fluorosilicone rubber contains trifluoropropyl groups next to the methyl groups. The mechanical and physical properties are very similar to silicone rubber. However, fluorosilicone offers improved fuel and mineral oil resistance but poor hot air resistance when compared with silicone.

Both o-rings and gaskets can be made from Fluorosilicone materials.

Names: Fluorosilicone, FVMQ

 

 Chemical Resistance 

Aromatic mineral oils (IRM 903 oil)

 Not Compatible 

Low molecular weight aromatic hydrocarbons (benzene, toluene)

Disclaimer: These are general guidelines only. All materials should be tested in your application.

 

  Ethylene Propylene (epdm) 

EPDM is a copolymer of ethylene and propylene. Ethylenepropylene-diene rubber (EPDM) is produced using a third monomer and is particularly useful when sealing phosphate-ester hydraulic fluids and in brake systems that use fluids having a glycol base.

Both o-rings and gaskets can be made from EPDM materials.

Names: Ethylenepropylene-diene rubber, EPDM, EPR, EPM

 

 Chemical Resistance 

Hot water & steam up with special compounds up to 400°F (204℃) 

Glycol based brake fluids up to 300°F (149℃) Many organic and inorganic acids 

Cleaning agents, soda and potassium alkalis 

Phosphate-ester based hydraulic fluids (HFD-R) 

Silicone oil and grease 

Many polar solvents (alcohols, ketones, esters) 

Ozone, aging and weather resistant

 Not Compatible 

Mineral oil products (oils, greases, and fuels).

Disclaimer: These are general guidelines only. All materials should be tested in your application.

 

 Packaging 

The requirements of packaging form an integral part of storage procedures as well as providing accurate identification.

With the exception of Silicone Rubbers which may deteriorate if totally enclosed, all vulcanized rubbers should be

sealed or wrapped to avoid the free access of air.

The packaging materials should preferably be opaque and free from such substances as copper naphthenates,creosote preservatives or any film containing plasticizer.

The product should be packaged in such a manner as to avoid distortion.

Some suitable materials are:-

Polyethylene coated Kraft paper, aluminium foil / paper / polyethylene laminate and opaque polyethylene film.

All initial Shelf Life dates are calculated from the Cure Date / Batch Date and are categorised

as follows for unassembled products:-

GROUPAInitial period 5 years , possible extension periods every 2 years

Natural (NR)

Polyisoprene (IR)

Polyurethane (AU)

Styrene-Butadiene (SBR)

 

 For More Information Or To Request A Quote On O-Rings, Please  Contact Us