Pre-Cut to length of Buna-N Nitrile O-Ring Cord

Enough cord to make a 3' Inside Diameter O-Ring or multiple smaller O-Rings.

Cord stock is O-Ring material, ready to be cut to create custom size O-Rings. There is a large selection of cross-sections available, and can be cut to any length you need or in standard put up lengths.

How to calculate O-ring cord length needed:

( ( OD + ID ) / 2 ) x Pi = length
Pi = 3.14159

Inside Diameter (ID) = Outside Diameter (OD) - twice the cross section (C/S)
ID = OD - (2 x C/S)

Make your own O-rings with O-ring Cord and O-ring Glue. How To Make an O-ring:

To calculate the correct length of cord required, (( OD + ID ) / 2 ) x Pi = Length. This will then give the correct length of cord required. Using the splicing aid and a very sharp knife. make a cut in the material at a right angle. All surfaces to be glued must be free of oil or grease. Avoid touching the surfaces. A thin layer of Cyanoacrylate Adhesive O-ring Glue should be spread over one side of the cut. A thin layer provides the best results. In order to join the two sides cleanly, use the V section on the splicing aid. Match both surfaces together and press firmly for 15 seconds. The glue must dry for 60 seconds before mounting the O-ring.

Silicone O-Rings (VMQ) Duro 70 - Brick Red - FDA:

The term silicone covers a large group of materials in which vinyl-methyl-silicone (VMQ) is often the central ingredient. Silicone elastomers as a group have relatively low tensile strength, poor tear and wear resistance. However, they have many useful properties as well. Silicone has a good heat resistance, good cold flexibility, and good ozone and weather resistance as well as good insulating and physiologically neutral properties.

Operating temperature:

• Heat resistance-Up to approximately 400°F (204°C)
• Cold flexibility-Down to approximately –75°F (–59°C)

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)
• Beer, Coffee, Whiskey and Milk
• Moderate water resistance
• Diluted salt solutions
• Sea Water
• Ozone, aging and weather resistant.

Not Compatible with:

• Silicone Grease and Oils
• Super-heated water steam over 250°F (121°C)
• Acids and alkalis
• Low molecular weight chlorinated hydrocarbons (trichloroethylene)
• Chlorine wet or dry
• Aromatic mineral oil
• Transmission Fluid
• Hydrocarbon based fuels
• Diesel Oil
• Aromatic hydrocarbons (benzene, toluene).