Kiltaş Refrakter

Plastic Refractories

Plastic Refractories

• The most important advantages of plastic refractories are that they allow some applications to be carried out without the use of molds, and if molds are used, the demolding time is very short (because there is no setting time like in castable). In the back wall. Additionally, the back wall is suitable for the application of fiber insulation products.
• Plastic refractories are presented in 50 mm thick slices in plastic vacuum bags and cardboard boxes to prevent moisture loss. It is recommended to store them in a cool, closed place. If it is to be stored outdoors, pallets should not be placed too close together, and it is advisable to protect them with tarpaulins and covers.
• Plastic material dries during storage, it can be reused by moisturizing with water.
• Plastic materials that have heat-setting properties lose their moisture through evaporation. Therefore, care should be taken to protect these types of materials from moisture during storage. Because if the material loses its moisture, it crumbles into dust and causes problems during application. The approximate shelf life of heat-curing plastic materials is between 3-6 months.
• The materials and equipment to be used are checked to ensure they are clean.
• Pneumatic ramming guns are used in the application of plastic refractories. For small areas, ramming by hand and with a mallet is possible.
• The use of molds during ramming is beneficial in terms of increasing compression strength and reducing cracks. Adhesion of the material to the inner surface of the molds can be prevented by pre-wobbling the mold.
• Regarding the timing of mold removal, it is recommended to do so before heat curing begins and after the material has slightly lost its moisture content.

• During the ramming process, the gun should be used at an angle of 70-90° to the material.

• The compaction process should be continued until it is ensured that the rammed layers are well compacted. Before the second layer is applied, the surface of the first layer should be scraped to provide bonding.

• After the ramming process, the surface should be scraped to aid in the drainage of water during heat curing.

• After the ramming process, a venting process should be performed to help the water in the back layers to escape. Drainage holes with a diameter of 3-4 mm and a distance of 100-150 mm between them are drilled. The hole depth should be 1/2 - 2/3 of the total plastic layer depth.

• After drilling, cutting operations should be performed in specific sections before the material hardens. The depth of the cut material should be 30–50 mm and applied at a right angle with added material. This cutting operation is for checking for capillary cracks that form after the material is put into operation and cooled. These cracks will disappear due to expansion when the material is put into operation and heated.
• Contact of the material with water should be prevented during plastic applications.
• In plastic applications made on ceilings, the material should be compressed from the sides, not from bottom to top.
• The ramming of refractories and the selection and application of anchoring systems are one of the important issues. Therefore, care should be taken to ensure that the application is carried out or directed by a competent professional.