Induction sealing wads are used to seal containers and preserve their contents from degradation or contamination caused due to exposure to air, moisture, or any other unwanted impurity. Because it is impossible to remove and reapply the wads without leaving visible evidence, induction sealing wads also prevent product tampering and counterfeiting.


The Process of Applying Induction Sealing Wads

An induction current is formed and transferred through a conducting aluminium foil disc present in the induction sealing wad, heating it up, after the containers have been filled and capped. A layer of the polymer film is laminated to the aluminium disc, which melts and clings to the mouth of plastic or glass containers to create an airtight seal. It just takes a few seconds for the process to finish, and neither the container nor its contents are impacted by temperature variations.

Induction Sealing Wads Come in Two Varieties

The container’s cap or closure is independent of the induction sealing wad. The wads come in a variety of shapes and sizes, but they are all typically multi-layered. In general, they can be divided into the following categories:

A. Cap Sealing Wads

1. Single Piece Sealing Wads

A single piece sealing wad is screwed around the container’s mouth and inserted into the cap. These capped containers have been designed to work with an induction heat sealer. As the threaded cap on the bottle applies the necessary pressure, the sealing layer clings to the bottle and creates a perfectly sealed surface.

2. Two-piece sealing wads

Two-piece sealing wads are made from an upper and a lower layer of paperboard (that may be glued to the cap). The following layer is wax, which is used to adhere an aluminium foil layer to the paperboard. A polymer film is laminated to the foil at the lowermost layer.


The container is passed over an induction coil, which creates an oscillating electromagnetic field after the cap or closure is screwed on the container. The conductive aluminium foil begins to heat up as the induction coil heats up.


The wax melts and is absorbed into the paperboard layer, allowing the foil to be loosened from the cap. The polymer film also warms up and pours over the container’s lip. When the polymer cools, it forms a bond with the container, resulting in an airtight seal. When the induction seal is removed from the mouth of the container, two-piece sealing wads are used to leave some sort of a secondary seal in the cap to prevent leakage.

B. Capless Sealing Wads

Capless sealing wads are used on the containers or bottles that are meant for single use. The cap seals that are applied to the containers are only limited to providing a spill-proof seal to the container.

Advantages of Using Induction Sealing Wads

1. Tamper-proof

The container’s mouth seal cannot be removed and replaced without leaving visible signs of tampering. It also aids to distinguish genuine products from imposters with similar appearances.


2. Protecting against leaks

The use of induction sealing wads to prevent leakage and improve shelf life is common in the food and beverage sector. To prevent liquid chemical items from spilling over other shipments, it is often necessary to seal them before transportation.


3. Freshness 

Induction sealing wads prevent contaminants in the environment from contaminating food products, and can even extend their shelf life.


4. Anti-pilferage measures

When induction sealing wads are removed, they cannot be replaced without leaving a trace of the original wad on the container’s mouth. It aids in determining whether or not there has been any pilferage. Pharmaceutical businesses, in fact, desire to buy wads that leave film or foil remains on containers as a deterrent to tampering or counterfeiting.


5. Long-term viability

In some cases, using induction sealing wads decreases container weight. The seal provides enough security to eliminate the requirement for a robust neck/closing.

Trust Holostik for Induction Sealing Wads

If you are in the search of the manufacturers of Induction Sealing Wads, look no beyond Holostik. We have been serving the industry for decades and have gained the trust of leading national and international firms for premium quality induction sealing wads. To know more about our induction sealing wads and other anti-counterfeit packaging solutions call us at 9905-124-124 or send us a mail at

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