Vacuum form acrylic process










The vacuum forming process forms the acrylic sheet as the outer surface. Fibreglass Bonded Acrylic involves a secondary step adds the fibreglass laminate to the underside to provide rigidity.

Acrylic sheeting provides an inherently durable outer surface, exhibiting high abrasion and solvent resistance, while maintaining high gloss and good aesthetics. Excellent formability enables sharp definition of shapes while maintaining a relatively even surface thickness.

Fibreglass Bonded Acrylic is being used with great success in the manufacturing of bathroom fixtures, boats, furniture, storage tanks, stadium seating and recreational vehicles, including dune buggies, snowmobiles, campers and trailers.

allnex products commonly used:

  • Acrylic Back-Up resin
  • Vinyl ester resin (chemical barrier coat)
  • Gun/Chopper Rovings
  • Catalyst
  • Release Agents

Steps

  1. Acrylic sheet is heated to forming temperature, then using vacuum, is stretched into a single-surface mould and held in place until cooled.
  2. A layer of specially formulated resin1 and fibreglass is sprayed to the underside of the formed sheeting to a predetermined thickness, and allowed to cure.  

Notes:

1A general purpose resin is not suitable for this application.  The resin used must be specially formulated to bond to the acrylic during the curing process to ensure a consistent and permanent bond is obtained between the sheeting and the laminate.  Further consideration is required if the end use application involves holding water for long periods, in this case a chemical resistant tie layer must be applied directly to the acrylic sheeting.  The resin is often heavily filled to create thickness at a low cost.