To install expanded PTFE cord, first confirm that its profile and material grade suit the joint, then clean and inspect the sealing surfaces, position the cord without stretching it, join the ends according to the product instructions, and tighten the assembly using the equipment manufacturer’s sequence and torque requirements. The correct method depends on flange geometry, operating conditions, and whether the cord has an adhesive backing. Do not treat a cord size, joint detail, or bolt torque as universal: confirm these against the equipment documentation and the cord supplier’s recommendations.
Expanded PTFE cord is a compressible sealing material used to form a gasket on a flange or equipment surface. It can be useful when the sealing path is not well served by a standard, pre-cut gasket, but performance depends on correct product selection and installation. Confirm that the cord is intended for the joint and that its stated operating limits cover the actual service conditions.
Record the equipment type, sealing-path shape, surface dimensions, and available space for the seal. Also identify the process media, operating temperature and pressure, and any vacuum or cycling conditions. These details help a supplier assess whether a particular cord grade and cross-section may be appropriate.
Use the product’s current technical information for its service limits rather than assuming all expanded PTFE cords have identical properties. For converting common drawing units, 1 inch equals 25.4 mm, 1 bar equals 100 kPa, and 1 MPa equals 10 bar. These are unit conversions, not recommended sealing dimensions or operating limits.
Have the specified cord, a suitable cutting tool, approved surface-cleaning materials, and the equipment documentation available. Isolate and depressurize the equipment before opening it, and follow your site’s lockout and safety procedures. If the joint is part of a hazardous process, use the maintenance and restart controls required for that process.
Remove the existing gasket or sealing material without gouging the flange or equipment face. Clean off residue using a method compatible with the equipment and process, then inspect the sealing path for corrosion, scratches, dents, warping, or other damage. A new cord cannot reliably compensate for a defective or poorly aligned joint.
Compare the cord’s cross-section with the joint space and the supplier’s recommendations. The cord must be positioned where the mating surfaces can compress it appropriately; a profile that is too large or too small may not seal as intended. If the joint dimensions are uncertain, measure the sealing path and available space, then confirm the proposed size before installation.
Lay out the route on the flange or equipment face and identify where the ends will meet. For a circular flange, keep the cord on the intended sealing path and clear of bolt holes and openings. On rectangular or irregular surfaces, plan how corners and direction changes will be formed, following the product supplier’s guidance rather than forcing a tight bend.
Apply the cord steadily along the route, keeping it in contact with the surface and avoiding twists, gaps, and abrupt changes in direction. Do not pull it tight to make it fit: stretching can leave sections under tension, which may affect how the seal sits after assembly. If the product has an adhesive backing, use it only as directed; the backing helps with placement and should not be assumed to replace compression from the assembled joint.
Bring the ends together in the manner stated in the product instructions. Depending on the cord design and application, the recommended joint may be a clean butt joint or another specified arrangement. Avoid creating an unapproved overlap or leaving a visible gap, and do not conceal an uncertain or damaged joint beneath the flange.
KAIQINGER contains other products and information you need, so please check it out.
Bring the mating surfaces together carefully so the cord does not shift or roll out of position. Install and tighten fasteners using the equipment manufacturer’s specified sequence, lubrication condition, and torque procedure. If a cross-pattern or staged tightening sequence is specified, follow it; do not substitute a generic torque value, because required torque depends on the fasteners, joint design, materials, and equipment.
Before returning the equipment to service, check that the joint is aligned and that no section of cord has been displaced. Record the product identification, cord size, installation date, and any specified tightening information in the maintenance record. Follow the site’s approved commissioning and leak-check procedure when the equipment is restarted.
An adhesive backing can help hold cord in place during assembly, particularly on a vertical or irregular surface, but it does not by itself establish that the product suits the service conditions. A non-adhesive option may be appropriate where the joint design or work procedure calls for it. Confirm availability and installation instructions for the exact product being considered.
On a flange, bolt-hole clearance, surface condition, alignment, and the specified tightening procedure are central considerations. On an equipment cover, manway, or irregular enclosure, the sealing path may include corners, changes in plane, or interruptions that affect cord placement. Share a drawing or clear measurements with the supplier when the joint geometry is not straightforward.
Use a consistent work instruction that identifies the cord product, sealing-path measurements, surface-preparation method, end-joint detail, and equipment-specific tightening procedure. Take photographs before closing a complex joint, especially where the route or corners may be difficult to inspect later. For recurring maintenance, record any installation or commissioning observations and have a qualified engineer assess changes before modifying the product or tightening procedure.
When converting dimensions from a drawing, keep the original units visible and verify conversions before ordering. For example, a drawing dimension in inches can be converted to millimetres using 1 inch = 25.4 mm. Make clear whether measurements describe the sealing-path length, the cord cross-section, or available joint space; these are different requirements.
A supplier can help review cord profile options and identify the application information needed for a product recommendation. Before requesting a quotation, prepare the joint type, dimensions or drawing, process media, temperature and pressure conditions, and any requirements for packaging or installation. Ask for the applicable technical information and product-specific instructions so your engineering or maintenance team can review the fit before purchase.
KAIQINGER supports B2B inquiries for expanded PTFE sealing products. Send your joint details and service conditions to discuss a suitable expanded PTFE cord option, confirm the information needed for selection, and request a quotation. The final product and installation method should be approved against your equipment requirements and operating conditions.
Installing expanded PTFE cord correctly means selecting a suitable product, preparing the sealing surface, routing the cord without tension, making the specified end joint, and tightening the equipment as its manufacturer directs. There is no universal cord size or bolt torque that can be applied to every flange and equipment seal. Start by documenting the joint geometry and service conditions, then confirm the product and installation details with your supplier before proceeding.
The company is the world’s best Expanded PTFE Cord supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.