Key Features
PTFE-coated fiberglass: Class H (180°C) insulation
Mr.Bond® heat sealing tape is a PTFE / Teflon-coated woven fiberglass tape backed with silicone adhesive. It combines the chemical, electrical and release properties of PTFE and silicone with the mechanical strength of woven fiberglass, delivering Class H insulation (180°C), high dielectric strength and a non-stick surface for heat-sealing equipment, packaging machinery and high-temperature electrical applications.
Manufactured under an ISO 9001:2015-certified quality management system.
Mr.Bond® Heat Sealing Tape is a PTFE (Teflon) coated woven fiberglass cloth tape backed with a silicone adhesive. It combines the chemical, electrical and release properties of PTFE and silicone with the mechanical strength of woven fiberglass, giving Class H insulation at 180°C, high dielectric strength with low electrical losses and non-tracking behaviour, and a low-friction, non-sticking smooth surface. It is used to cover the sealing bars and jaws of heat-sealing equipment and packaging machinery, where molten film and hot adhesive must release cleanly instead of building up, and in high-temperature electrical applications where an insulating tape has to hold its dimensions under heat and pressure. It offers excellent chemical resistance, excellent mechanical strength and superior heat and cold resistance. Manufactured by Lalit Jain Industries Pvt. Ltd. (LJIPL), ISO 9001:2015 certified and founded in 1987, at Rai, Sonipat (Haryana) and Bawana, Delhi NCR, India. Custom sizes are available.
The classic application is covering the sealing bars and jaws of heat-sealing equipment and packaging machinery. Those surfaces run hot and press directly onto plastic film, so without a release layer the film welds to the tooling and the machine starts producing rejects.
PTFE, better known by the trade name Teflon, gives a low-friction, non-sticking smooth surface that molten film will not adhere to. Woven fiberglass underneath supplies the mechanical strength and dimensional stability under heat and pressure that a bare PTFE film would not have.
The same construction is used in high-temperature electrical work, where the Class H (180°C) rating, high dielectric strength, low electrical losses and non-tracking behaviour all apply. The wider industrial tape range is at Lalit Jain Industries Pvt. Ltd. (LJIPL).
Because each material supplies what the other lacks. PTFE has the chemical resistance, the electrical properties and the release surface, but on its own it is soft and stretches under load. Woven fiberglass cloth has excellent mechanical strength and holds its shape, but it is not a release surface.
Coating the cloth with PTFE and backing it with a silicone adhesive produces a tape that combines the chemical, electrical and release properties of PTFE and silicone with the mechanical properties of woven fiberglass.
Silicone adhesive is the third part of the system: it is the adhesive family that holds at the temperatures this tape is meant for, where a standard acrylic or rubber adhesive would soften and creep.
Class H is a thermal classification for electrical insulation materials corresponding to 180°C. Quoting a class rather than a single temperature describes the material as suitable for continuous service at that level, which is the number that matters in machinery running all shift.
Alongside the Class H rating the tape offers high dielectric strength, low electrical losses and non-tracking behaviour, tracking being the surface carbon path that can form on an insulator over time and defeat it.
Variants include standard PTFE fiberglass tape and Nitto 923S for heating rollers, and custom sizes are available. Send your roller or sealing bar dimensions with your enquiry. Our guide to PTFE fibreglass heat sealing tape explains what a release surface does on a jaw and lists the six things worth measuring first.
For the other tapes used in electrical and electronic assembly work, see tapes for the electronics industry.
Sealing jaws press hot onto plastic film all shift. A PTFE coated fiberglass cover gives a low-friction, non-sticking smooth surface so film releases cleanly, and the woven fiberglass holds dimensional stability under heat and pressure instead of stretching.
Wherever heat and pressure are applied through tooling, adhesive and molten polymer tend to build up on the tool face. The PTFE surface prevents that build-up, and excellent chemical resistance means the tape is not attacked by what it is releasing.
The tape provides Class H insulation (180°C) with high dielectric strength, low electrical losses and non-tracking behaviour. Excellent mechanical strength and superior heat and cold resistance make it suitable where an insulating wrap must survive both heat and handling.
It is a PTFE (Teflon) coated woven fiberglass cloth tape backed with a silicone adhesive. That construction combines the chemical, electrical and release properties of PTFE and silicone with the mechanical strength and dimensional stability of woven fiberglass cloth.
Class H insulation, which corresponds to 180°C. A thermal class describes continuous service capability rather than a momentary peak, which is the relevant figure for sealing machinery and electrical equipment that runs hot throughout a shift.
PTFE gives a low-friction, non-sticking smooth surface. Sealing bars press hot onto plastic film, and without a release layer the film adheres to the tooling and the machine starts producing rejects. The PTFE surface lets the film release cleanly and stops residue building up on the jaw.
Yes. It offers high dielectric strength, low electrical losses and non-tracking behaviour, alongside its Class H (180°C) rating. Tracking is the conductive surface path that can develop on an insulator over time, so non-tracking behaviour matters in high-temperature electrical applications.
Yes. Standard PTFE fiberglass tape is available, and Nitto 923S is also available for heating rollers. Custom sizes can be supplied. Send the roller or sealing bar dimensions, the operating temperature and the quantity you need and the requirement will be quoted.
Lalit Jain Industries Pvt. Ltd. (LJIPL), an ISO 9001:2015 certified manufacturer founded in 1987 and led by directors Mr. Prateek Jain and Mr. Shikhar Jain. It manufactures at two Indian units, Rai, Sonipat in Haryana and Bawana in Delhi.
