Fibral non-woven abrasive material can be converted into endless belts. The bulk and openness of the fibral backing requires additional adhesive, additional drying time, lower pressure and lower press temperatures than standard coated abrasive belt making techniques.
• Cut belts to desired angle - Recommend 55°, 67°, or 75° bias angle.
• Abrade nap from non-abrasive side - Recommend 80 grit abrasive belt or flap wheel.
|Resin:||Sheldahl A0455 or Bostik 7070||100 parts by weight at 20% solids||100 volumes|
|Curing:||Desmodur® RE or RFE||11-15 parts by weights||8 - 10 volumes|
Generously apply primer to scuffed area of backer and edge of butt. NOTE: It may be possible to spray the backing with multipass but it will require some dilution and experimentatioin by the fabricator.
When using a brush or roller, apply a liberal amount.
When using a tape coater, the following coating gaps are recommended for Sheldahl splicing tapes.
T1880, T1882 0.012” to 0.016” plus tape thickness
T1886, T1878 0.022” to 0.026” plus tape thickness
Allow adhesive on backer and tape to dry approximately 30 minutes.
Press pad plastic panel or webbing are required on the grit side. Place pre-tacked belt in bonding press with a release sheet/pad configuration to prevent bonding to the heated bars.
|Time:||7 to 12 seconds|
|Temperature:||Room temperature to 150°F (65.6°C)|
|Pressure:||Low pressure required.
Recommend 1000 to 2000 psi
|Sheldahl A0455||Desmodur RE or RFZ|
|Sheldahl Technical Materials||Mobay Chemical Co.|
|1150 Sheldahl Road||Plastics & Coatings Division|
|Northfield, MN 55057||Penn Lincoln Parkway West|
|507/663-8000||Pittsburgh, PA 15205
Sheldahl Technical Materials
The above recommendations are based on preliminary evaluation of a coarse grit product. As more information and products become available, Sheldahl will update its suggestions.
Product data is for informatioin only and may vary dependent on individual products and processes. Sheldahl does not guarantee, nor will it accept obligation or liability based on the use of this data. All data subject to change without notice.