Weld-Fit Vents

Donaldson Weld-Fit enclosure protection vents can be configured into virtually any size and shape to provide enclosure protection against particles, fluids and pressurization issues without negatively affecting the operation of your device.

Donaldson Weld-Fit enclosure protection vents combine various component solutions into an integrated venting solution that will ensure your application's performance, no matter what the environment. 

Weld-Fit solutions may include ePTFE media paired with the correct welding process applied to a configurable plastic housing. Donaldson engineers will work with you to ensure the proper media treatments (e.g. oleophoic, hydrophobic) and the proper welding method to guarantee your integrated venting solution is ideal.  

For customers who have the ability to weld ePTFE media into their own plastic housings, Donaldson can create tailored size and material combinations. Our experienced engineers will partner with you to determine the required parameters for your application and together create the best solution.

Key Features & Benefits

• Prevents the passage of harmful particles and liquids into the device
• Allows for constant pressure equalization during altitude and temperature fluctuations
• High efficiency particulate removal
• Venting of gases and pressure equalization in both directions
• Oleophobicity ratings from 1 to 8
• IP ratings from IP44 to IP67/IP68
• Easy application and device integratio
• Custom sizes and shapes are available

Standard Materials

• The many options include Donaldson's proprietary Tetratex™ ePTFE membrane, woven, nonwoven, and extruded materials such as nylon, polyester, polypropylene, and polyester/polyethylene
• Hydrophobic and oleophobic acoustic materials are available
• Membrane thickness: <0.3mm (<0.012 in.)
• Continuous Operating Temperature Range: -40° to 149° C / -40° to 300° F
• Minimum efficiency of 99.97% on 0.1 micron particles
• Material data sheets available upon request

Handling Instructions

• Wear gloves or use rounded tweezers when handling the vents
• Mounting surfaces should be clean and free of oils, particles, and other contaminants
• Follow dispenser instructions when using an automated vent dispenser
• For manual vent dispensing, roll the liner under the vent until the vent extends beyond the liner and becomes easily accessible
• Do not pry the vent from the liner or fold the vent, as this could damage the vent

Typical Construction of Weld-Fit Assemblies

A Weld-Fit Assembly is comprised of a filter material attached thermally, with adhesive, or over-molded in a plastic housing and supplied as a vent assembly.

Typical Weld-Fit Assemblies include:

• High efficiency PTFE membrane - Acts as particulate, hydrophobic, and oleophobic barrier while allowing necessary gases to flow through
  
• Plastic housing - Incorporates the filter material and is designed to fit into your enclosure. Available in a wide variety of thermoplastics, elastomers, and other materials

Packaging Options

• Weld-Fit Media:
  • Manufactured, inspected and packaged in clean room environment
  • Supplied on a light-tack adhesive continuous release liner: 2,000 - 5,000 parts per polyethylene cores
  • Roll sealed in clean room bag unless otherwise specified
  • Optional protective liner
     
• Weld-Fit Assemblies:
  • Manufactured, inspected and packaged in clean room environment
  • Supplied in stackable trays and sealed in cleanroom bags, ready to be picked by a robot or other automated equipment
  • Bulk packaged in cleanroom bags