As a general rule Pneuma-Seal, molded or extruded, is flexible enough in a radial expansion outward (or inward) application to conform to a corner radius of between four and eight times its relaxed height, depending on the specific profile (see Fig. 1); however, the expansion in these corners will always be at least partially restricted unless the radius is even more liberal than this. The effect is more severe when the seal is positioned for radial expansion inward than when positioned for radial expansion outward. Therefore, when the designer has a choice, radial expansion outward configurations are always preferred.

Square right angle corners are not available for seals which expand radially inward or outward; however, if the requirement is to seal a rectangular opening with a radially outward expanding seal, a special design can be furnished. In some cases, square corner tooling is readily available. Please review the "Profile Details" tab within the Standard Profiles section for this information (sign-in required).

In axially expanding (face) applications, corners of rectangular non-reinforced Pneuma-Seal (Fig.2) can be preformed to minimum centerline radii approximately twice the cross section width. Consult Pawling for exact dimensions.

When using molded fabric-reinforced Pneuma-Seal, designers are cautioned to consult with Pawling to avail themselves of existing corner molds.

Square right angle corners (Fig. 3) can be furnished for some axially expanding (face) applications; however, the working "gap" may, in some cases, be reduced from the figures shown on this site. Consult Pawling for specifics.

Sealing Rectangular Openings with Radially Outward Expanding Seal

Since square right angle corners are not available on radially expanding Pneuma-Seal inflatable profiles, intermediate sealing pads are employed between the radiused seal and the square corners of the opening to be sealed.

These pads can be bonded to the seal (Fig. 1) or to the corners of the opening (Fig. 2). Where possible, Figure 2 is recommended in lieu of Figure 1.

For further information, please review the following:

• Typical Configurations
• End Configurations
• Special Configurations