Active Member
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[China]
Address: Room No.3, Houyu Da, Zhongyi Village, Gulin Town, Haishu District, Ningbo Zhejiang China
Contact name:Gary Liu
Ningbo Hydraulic Sealing Co.,Ltd |
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Description:
Fractional Inch | Metric | As 568 | Decimal Inch | 70 NBR | 70 Sil | 70 FKM | 70 EPDM |
| 1 mm | .039 | B | B | C | C | ||
| 1/16 | .063 | A | B | B | B | ||
| -0xx | .070 | A | A | A | A | ||
| 2 mm | .079 | A | B | B | B | ||
| 3/32 | .093 | A | B | B | B | ||
| 2.5 mm | .098 | B | B | C | C | ||
| -1xx | .103 | A | A | A | A | ||
| 3 mm | .118 | A | B | A | B | ||
| 1/8 | .125 | A | A | A | B | ||
| -2xx | .139 | A | A | A | A | ||
| 5/32 | .156 | A | A | A | B | ||
| 4 mm | .157 | A | B | B | B | ||
| 3/16 | .187 | A | A | B | B | ||
| 5 mm | .197 | A | B | B | B | ||
| -3xx | .210 | A | A | A | A | ||
| 6 mm | .236 | A | B | B | B | ||
| 1/4 | .250 | A | B | B | B | ||
| -4xx | .275 | A | A | A | A | ||
| 5/16 | .312 | A | B | B | B | ||
| 8 mm | .315 | B | B | B | B | ||
| 9 mm | .354 | A | B | B | B | ||
| 3/8 | .375 | A | B | A | A | ||
| 10 mm | .394 | A | B | B | B | ||
| 7/16 | .437 | A | B | B | B | ||
| 1/2 | .500 | A | B | B | B | ||
| 5/8 | .625 | A | B | B | B | ||
| 3/4 | .750 | A | B | B | B |
| Code | Inventory Status |
| A | In Stock |
| B | Special Order |
| C | Not Available |
Please Contact us regarding sizes and materials not listed
O-Ring Cord is supplied as a continuous extruded cord. O-ring cord can be used to fabricate custom o-rings where the standard sizes are not suitable. O-rings are probably most widely used and simplest types of seal they are found everywhere from plumbing installations to the space shuttle, they are common in engines and gearboxes, garden hoses, pumps etc. They can be used as face to face seals (like a gasket) or as shaft seals and facilitate both rotary and linear movement. They have a wide operating temperature range from - 30 deg Celsius up to + 120 deg Celsius and a high degree of chemical resistance
Our cord is supplied by the metre to any length. Most of the elastomers and cord sizes quoted are available from stock or on short lead times. Other sizes and elastomers can be supplied on request.
O-Ring cord is available off-the-shelf in a number of sizes:
| Polymer | Hot | Cold |
| Nitrile (NBR) | Y | Y |
| Silicone (VMQ) | Y | |
| Fluoroelastomer (FKM) | Y | Y |
| EPDM | Y | Y |
| Neoprene | Y | Y |
Precision Associates extruded O-Ring cord can be ordered in 4 standard materials as well as specialty compounds. NBR, Silicone, FKM, EPDM are generally available from stock.
We supply O-Ring Cord stock either as bulk (spooled) Cord, custom cut length or Vulcanized into custom O-Rings. Priced and ordered by meter, if ordering more than one meter (of the same size), the cord will come as one whole length. Available in either metric or standard sizes
Applications
The primary application for cords is as the basic material for
joined O-rings. They are similar to the O-ring in the way they are
handled and applied. They are used as static seals, e.g. for
sealing larger pipe unions and as cover seals in container
construction. Cords are frequently used for on-site repairs, being
joined together to provide the "customized" dimensions.
The process of end-joining cords to form a joined O-ring can be undertaken using cyano-acrylate or 2-component adhesives. However, for applications in seawater or other more demanding applications, bonding by means of an end-vulcanisation process is required.
Production of joined cord O-rings
Step 1 The normal procedure is to first cut the cords to length and then
bond them using a cyano-acrylate adhesive. The operational
temperature limit is approx. 80 ℃.
Step 2. With EPDM, VMQ and FKM cords, in certain circumstances the use of a special primer may also be required. Ensure that the manufacturer's product information and safety instructions are observed.
Step 3 Before bonding, both ends to be joined should be roughened with a fine sandpaper and cleared of any grease using a suitable cleaning agent. The two ends should not be under any pressure during the bonding process. Then check that the joint has cured completely through. The end-joined cord must not be stretched at its joint. The joint created displays a distinctly lesser degree of bending elasticity than the cord itself.
Installation
Avoid damaging the O-ring during installation, as this will cause
leakage. Observe the following:
Step 1 The end-joined O-ring must not be stretched over the joint and the
rest of the O-ring must not be expanded to its elongation limit.
Step 2 Edges must be burr-free, radii and angles applied smoothly.
Step 3 Dust, dirt, metal chips and other particles must be removed.
Step 4 Tips of screws and installation housings for other sealing and
guiding elements should be covered by an assembly sleeve.
Step 5 A suitable grease to be applied to the assembly surfaces and
O-rings.
Step 6 Elastomer materials are made smoother if they are heated in oil or
hot water to approx. 80 ℃. This makes it easier to stretch the
O-ring for assembly.
Step 7 Any assembly tools used, such as expansion mandrels or sleeves,
should be made of a soft material (e.g. POM) and not have any sharp
edges.
Step 8 The cord or joined O-ring should not be rolled over assembly
surfaces. Ensure it is not twisted as it slots into the groove.
We can provide technical information on all our O ring cord materials. Please contact us to request technical data sheets for more details.
Our Services:
1. Convenient: 24th Hours sales/After-sales Service online or on
the phone
2. Quality Assurance: We will discuss with you and supply you the
best quality comfortable to your market
3. Quick delivery: Time is money, we promise we always will deliver
the goods quicker than others
4. According to customers’ drawing,customized specifications are
welcomed
5. Low MOQ,small orders can be accepted.
