Before choosing a correct PS foam board, We shall firstly understand why the PS foam board itself would blister:

1) The ripening period is too short

The ripening period of PS foam board core is too short, and more foaming gas will be left. With the gradual increase of temperature in summer, the gas in the board core will become active and easier to release outward, which is the key to the blistering of KT board.

2) Inferior face liners

Some manufacturers choose fake outer liners or inferior outer liners in order to reduce the cost of raw materials. The high-quality double-layer composite liners can resist the corrosion of the back glue and avoid the blistering problem caused by the gas leakage in the board core.

3) Save time and cost

In order to pursue production capacity, some manufacturers will adjust and accelerate the speed of the PS foam board lamination production. Because the heating lamination time is too short, the face liners and the board core show “false adhesion,” The position without adhesion will be propped up by the board core gas, thus forming bubbles.

Blistering Phenomenon of PS Foam Board

4) Face liners overstretched

To save materials, most manufacturers will over-stretch the face liners during production. When the adhesive vinyl film is mounted on the KT board, it will erode the surface and produce gas, resulting in blistering.

There are many types of PS foam boards on the market. In summer, choosing PS foam boards covered with high-quality composite liner films is recommended. The face liners on the surface can isolate the corrosion of the back glue on the board core and eliminate the blistering problem after mounting.
Of course, there is also the mounting processing method of end customers, which is also a source of problems. It needs a comprehensive analysis to find out the specific reasons.

PS foam boards are cost-effective and ideal for a wide variety of short-term interior graphic arts applications, including point-of-purchase displays, exhibitions, temporary signs, models, presentation boards, photo mounting, and picture framing.

What is the difference between the KT board (PS foam board) and PVC board?

At the event site, KT board and PVC board are widely used. But many people can’t tell the difference between the KT board and the PVC board. Some even think that the two materials belong to the same kind. As an event organizer, it’s a layman. Let Skyline Composites tell you the difference between the two.

KT board is a new type of material formed by foaming PS particles into the board core and laminating on the surface. The board body is straight, light, not easy to deteriorate, and easy to process. It can be directly screen-printed on the board (screen printing board), painted (paint adaptability needs to be tested), mounted back glue picture, and spray painting. It is often used in advertising display and promotion, architectural decoration, culture and art, packaging, and so on.

In terms of advertising, one is the mounting lining board for exhibition, display and announcement of product publicity information release, and the other is widely used in one-time screen printing, which is especially suitable for large-scale unified publicity activities.

PVC foam board, also known as Chevron board and Andy board, is made of polyvinyl chloride. There are three main product styles. The first is the Co-extruded foam board, having a layer of non-foaming rigid skin on the surface that is extra smooth and flat. The second is Celuka foam board, having a layer of hard skin on the surface that is smooth and dense. The third is free foam board, with no skin on the surface. The face is in a fine concave-convex shape (pitted surface).

From the product introduction, the most significant difference between the two kinds of boards is that the chemical raw materials are different.

The difference in application is: KT board is mainly used for indoor advertising display boards, while PVC foam board is frequently used for outdoor advertising display in the advertising industry. In other aspects, PVC foam board is more popular, and its relative value will be more costly than KT board. Therefore, the difference between the two depends on the specific purpose.

Of course, the application in the activity site depends on the needs of customers and the requirements for material quality.

The above is a simple analysis from Skyline Composites. You can go to our official website ( ) to learn more about the details of our advertising boards.