Hot Tubs, Spas & Hot Tub Chemicals from HotTubs 2 Buy the Spa Specialists in the UK

The cast aluminium mold for a hot tub is designed and made by a team of Computer Aided Designers at a cost of over £80,000 to ensure that the inside of the hot tub is ergonomically perfect for the human body. The heavy aluminium mold now loaded with polyethelene granules is mechanically loaded onto a tri axis arm ready to be baked in a 30 cubic metre computer controlled gas flow oven. This process will take around one hour at over 350 degrees centigrade constantly rotating on three axis so that all of the polyethelne will adhere evenly to the inside of the mold.

Unlike injection molding this process ensures there are no weak points within the structure and maintains a constant polyethelne thickness throughout meaning rotationally molded hot tubs are some of the strongest in the industry. Once the cooking process is complete, the mold will be removed from the oven and cooled for a further hour using water and air jets. This cooling process is a vital part of the process to allow the chemical bonds in the polyethelene to bond together before removal from the mold.

Once the hot tub is cooled it is removed from the mold using pneumatic air jets it is carefully inspected by a quality control manager for any imperfections that may have occurred in the rotational molding process. If any irreparable imperfections are found the tubs life will end there and it will be ground down to be remolded again.