Specifications:
The document outlines the characteristics of Tecnifuelle bellows, which are adaptable to various guide shapes and are impermeable to liquids such as drilling fluids and oils. They are available in different versions (vertical, horizontal, transverse) and shapes (square, rectangular, octagonal, etc.). The bellows can operate at speeds up to 200 meters per minute.

Construction and Materials:
Straight heat-welded bellows are made from a core of rigid polyamide fabric with PVC layers. They include rigid PVC supports welded to the fabric, with optional polyurethane slides to reduce noise and improve sliding. Stretching belts may be included for uniform opening. Circular bellows are designed with a core of polyamide fabric and PVC layers, suitable for temperatures up to 70°C, with options for higher temperatures using materials like fiberglass and Viton.

Applications:
These bellows are used in environments with hot chips, liquids, and in industries like timber and wood to prevent debris from entering the folds. They are also used in grinding and milling machines.

Assembly and Fastening:
Bellows can be fastened using steel frames or Velcro, depending on the application. For heavy vertical elements, stretching devices or scissors-type systems are used.

Design Considerations:
Key parameters for designing bellows include maximum length, compressed length, machine travel, and fold height. The number of folds is calculated based on machine travel and extended length.

Materials and Temperature Resistance:
The document lists various fabric types and coatings, such as polyester with PVC or polyurethane, and their thicknesses and temperature ranges. These materials are chosen based on the operating conditions, such as resistance to dust, acids, oils, and high temperatures.

Summary of Key Data:
- Maximum length and compressed length are critical for design.
- Different assembly positions (horizontal, vertical, transverse) are possible.
- Materials are selected based on environmental conditions and temperature requirements.