Molded Rubber Bellows and Boots

Rubber bellows and boots can be sourced as off-the-shelf or custom designs. In fact, many manufacturers offer both options. Dynatect manufactures both custom molded rubber bellows and stock rubber bellows for standard rod sizes.

Rubber bellows have versatile functions as “dust boots” or seals, used to seal out dust and other light-duty environmental factors while allowing a specific stroke or predetermined range of motion. They are quite common in industrial and automotive applications.

Similar to rubber bellows are products that function as tubing, ducting, or even as an expansion joint. However, bellows are mainly employed as a protective cover.

Depending on the manufacturing process, molded bellows may have an extended resting position (convolutions are extended in resting position). Think of a convoluted drainage pipe for example.

Most types of molded rubber bellows tend to have a large extended-to-retracted ratio, and the overall bellows is stiffer. Other bellows may have a closed resting position (convolutions are compressed in resting position).

Dynatect has a wide variety of manufacturing processes to produce a molded bellows in either style. In particular, a formed Dynatect bellows is quite rigid and rugged.

In comparison, Dynatect’s Gortiflex rubber bellows have an excellent extended-to-retracted ratio, meaning the tight compression can satisfy a more dynamic range of motion.

Molded bellows typically have a more rounded peak at each convolution:

molded rubber bellows  molded formed bellows

Other rubber (technically elastomer coated materials) bellows are made by sealing or stitching alternating inner and outer rings of material, resulting in convolutions that are “sharper” or more v-shaped. The latter tends to have a more “industrial” look, although Dynatect’s Thermiseal bellows are exceptionally neat in appearance.

Sometimes bellows are referred to as “convoluted tubing”, yet the mounting requirements and ability to flex qualify these as more than simply “tubing”. Flanges and collar options, along with back-up plates and worm-gear clamps, satisfy common mounting requirements. While mounting accessories can be specified at the time of order, it is better to think about mounting requirements at the time of quote.

 

Convolutions are open while bellows is resting
gortiflex molded bellows
Closed peaks in resting position
Dip-molded bellows
Close up: Thermiseal bellows
Thermiseal bellows (close-up)

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