PTFE Coated Glass Cloth Tape

PTFE Coated Glass Cloth Tape for Heat Sealing and Release

J-710 uses a PTFE-coated fiberglass cloth backing with a single-sided silicone pressure-sensitive adhesive. This PTFE fiberglass tape is used on heat-sealing bars and jaws in packaging equipment and on release surfaces where processed material tends to stick. The fiberglass-reinforced construction differs from unsupported PTFE film tape. Four thickness grades are listed in the finished-product performance table. The inquiry table below lists the application and process details we need to review a grade and roll format for you.

Construction and Typical Product Data

Product Construction

J-710 is slit to agreed widths and rewound into agreed roll formats. Include the required width and roll format with the inquiry so that the requested configuration can be reviewed.

Finished Product Typical Values

These are typical values and should not be considered specifications. The values are based on ASTM, FINAT, and other standard test methods. Final performance should be validated under the actual substrate, process temperature, dwell time, and operating conditions.

Applications and Selection

Heat Sealing

J-710 is applied to the contact face of heat-sealing bars and jaws so that the packaging film contacts the non-stick PTFE surface rather than the bare jaw. The tape sits in the heat-transfer path, so total thickness and surface condition can affect the heat and pressure reaching the seal. When describing the application, identify the equipment, the contact face, the packaging material, and the required seal appearance.

Before specifying the tape width, measure the contact-face width and decide whether the tape needs to wrap around either edge. If edge wrapping is required, include the wrap allowance on both sides in the required width and state the intended coverage in the inquiry.

Release Surfaces

As a PTFE release tape, J-710 is used on equipment surfaces where processed material tends to adhere. Whether the material releases cleanly can depend on the processed material, temperature, pressure, and contact time. When you inquire, state which material is sticking, the surface it sticks to, and the process conditions under which it happens; the inquiry table lists the details we need.

Selection Factors

PTFE Glass Cloth or PTFE Film Tape

PTFE coated fiberglass tape such as J-710 uses a reinforced woven backing, while an unsupported film construction has no woven backing or weave pattern. Where the project requires a flatter surface without a cloth weave, evaluate PTFE Film Tape as a separate construction. Match the construction to the surface and process requirement rather than treating the two materials as interchangeable.

Replacing a Current Tape

Use the following checks before selecting a replacement grade:

1. Inspect the surface for a visible weave and examine the cut edge to distinguish a glass-cloth backing from a film construction.
2. Measure total thickness with a thickness gauge at several positions and retain the individual readings with the current-tape record.
3. Check the roll core, label, or available product information for the adhesive system instead of identifying it from appearance alone.
4. Record whether a release liner is present, the tape width, whether the tape wraps an edge, the amount used at each replacement, the location of failure, and the time in service.
5. Match the backing structure and total thickness first, then use the performance table to identify the corresponding J-710 grade for evaluation.

Our In-House Processing and Capabilities

We apply the adhesive to the backing of J-710 PTFE coated glass cloth tape in-house. We also slit J-710 rolls to agreed width requirements and rewind them into agreed roll formats in-house.

Our capabilities also include OEM slitting to agreed width requirements and logo and label printing. If you need OEM slitting or logo and label printing, state the requirement in your inquiry for order confirmation.

We maintain our own testing laboratory. Our QC department is responsible for product quality.

Understanding the Data and Validating the Application

Reading the Typical Data

Total thickness is the thickness occupied by the complete tape on the contact surface, while backing thickness refers to the PTFE-coated fiberglass cloth itself. Use total thickness when comparing the space occupied by a current tape and a candidate grade. Keep backing thickness as a separate construction value.

Adhesion to steel is a typical value measured on steel. A machine surface may differ in material, coating, finish, cleanliness, or condition, so bonding to the actual surface requires a trial.

Tensile strength describes the force required to break a tape strip under tension. It is reported per 25 mm of width. It is not a measure of abrasion resistance or service life.

The performance table shows low elongation at break. Low elongation means the backing changes little in length before it breaks. Apply the tape without stretching, especially when aligning an edge or crossing a change in surface geometry. Avoid pulling the tape to force it around a shape.

The temperature-resistance entry is a typical value. It does not by itself state the exposure duration, pressure, or contacting material. Compare it with the actual contact temperature and dwell time recorded for the process. An equipment setpoint may not be the same as the temperature at the contact surface. For repeated heating conditions, both the contact and non-contact portions of the cycle need to be considered.

Installation Points

1. Before replacement, switch off the relevant equipment and allow the heat-sealing area to cool to a temperature at which it can be handled safely.
2. Clean and dry the complete bonding surface, removing old adhesive, film residue, oil, and other visible contamination.
3. Position the tape flat and aligned without stretching it while following the intended coverage and edge location.
4. Avoid wrinkles and trapped air, and keep any overlap outside the active sealing area.
5. Apply even pressure across the full bonded area, including the edges and ends.
6. Cut the tape with a sharp knife or scissors to keep the fiberglass edge neat; loose fibers at the cut edge may affect the seal.

Trial Observations

Typical values are not equipment settings or acceptance limits. A short trial result does not establish long-term suitability.

Information to Include with an Inquiry

Provide the available information below and mark unknown items clearly. This allows the requested construction and trial conditions to be reviewed without assuming missing details.

Further Reading

For related reading, see PTFE Release & Heat Sealing, Material Comparisons, and Failure Analysis.