How wooden fire rated doors are made

Wooden fire rated doors are made using a combination of special materials and construction techniques to provide the necessary level of fire resistance. Here are the general steps involved in making a wooden fire rated door:

1. Materials selection: The wood used to make a fire rated door is carefully selected to ensure that it has the necessary fire resistant properties. Common wood species used include oak, birch, maple, and cherry.
2. Core material: The core of the door is typically made of a fire-resistant material such as mineral core, vermiculite board, or honeycomb core and calcium silicate board and Mineral fiber wool. This core material is sandwiched between two layers of wood or other fire-rated materials.
3. Lamination: The layers of wood and core material are laminated together using a special adhesive that is designed to withstand high temperatures.
4. Sealing: The edges of the door are sealed with fire-resistant seals to prevent the spread of fire and smoke around the edges of the door.
5. Hardware installation: Hinges, locks, handles, and panic bar and external trim and mortise door lock with handle and dead lock and pull handle can also be used as per customer door specification.
6. Finishing: The door is sanded, primed, and painted or stained to provide a finished appearance. Veneer can also be used with polish to good aesthetic look to doors.

During the manufacturing process, the door is subjected to rigorous testing to ensure that it meets the required fire rating. Fire rated doors are typically tested and certified by independent organizations such as Underwriters Laboratories (UL) or Intertek, which provide ratings such as 20-minute, 45-minute, 60-minute, or 90-minute fire resistance.In india CBRI roorkee is the major laboratory to test wooden fire doors .