Introduction
Fire resistant mortars are used to prevent or slow down the spread of fire in buildings. These mortars are made of specific materials that can withstand high temperatures and prevent the spread of flames. In this article, we will discuss the key ingredients that make a mortar fire resistant.

Key Ingredients of Fire Resistant Mortars
1. Clay
Clay is the primary ingredient in fire resistant mortars. It is used because of its ability to resist high temperatures without losing its strength. The clay used in fire resistant mortars should be free from lime, as lime can reduce the fire resistance of the mortar.

2. Iron oxide
Iron oxide is added to fire resistant mortars because it can help to improve the mortar's ability to withstand high temperatures. Iron oxide is also known for its fire resistant properties, which makes it an ideal ingredient for fire resistant mortars.

3. Low compaction
Fire resistant mortars are made with a low compaction process. This means that the mortar is not compressed tightly, which allows it to expand and contract as it heats up and cools down. This process helps to prevent cracking and crumbling of the mortar during a fire.

4. Dissolved air
Dissolved air is also added to fire resistant mortars. This is done to improve the mortar's ability to resist cracking during a fire. When the mortar is exposed to high temperatures, the dissolved air expands, which helps to prevent the mortar from cracking.

Conclusion
Fire resistant mortars are an essential part of building construction. They are used to prevent or slow down the spread of fire in buildings, and they are made of specific materials that can withstand high temperatures. The key ingredients of fire resistant mortars are clay, iron oxide, low compaction, and dissolved air. These ingredients work together to create a mortar that can withstand the extreme temperatures of a fire.