1. Characteristics of high silica fiber

High Silica Fiber is an inorganic fiber material with high-purity silicon dioxide (SiO₂ content ≥ 96%) as the main component. It is made through a special process and has the following core characteristics:

1. High temperature resistance :

   • Long-term temperature resistance is 1000℃~1200℃ , and short-term temperature resistance can reach 1600℃ (such as momentary spark sputtering).

   • The fiber structure is stable at high temperatures, does not melt or shrink, and is far superior to ordinary glass fiber (temperature resistance 500℃~800℃).

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2. Low Thermal Conductivity :

   • The thermal conductivity is as low as 0.06~0.1 W/(m·K) , effectively blocking heat conduction and radiation.

3. Chemical stability :

   • It is resistant to acid and alkali corrosion and has strong antioxidant properties, and is suitable for complex environments such as chemical industry and metallurgy.

4. Flexibility and strength :

   • The fiber is flexible, can be folded and cut, has high tensile strength and is not easily damaged.

5. Environmental safety :

   • It does not contain harmful substances such as asbestos and halogen, and complies with RoHS and REACH environmental standards.

2. Advantages of high silica fireproof cloth

Compared with other welding fireproof cloths (such as glass fiber, ceramic fiber), high silica fiber fireproof cloth performs better in the following scenarios:

1. Extreme Heat Protection :

   • It is suitable for operations that generate ultra-high temperature sparks, such as plasma cutting and high-temperature arc welding .

2. Thermal shock resistance :

   • It can withstand drastic temperature fluctuations (such as rapid cooling after welding) and the fiber is not easily brittle.

3. Lightweight and convenient :

   • It is 30%~50% lighter than ceramic fiber cloth and is easy to hang, lay and move.

4. Long life :

   • It can maintain structural integrity after repeated use and has low maintenance costs.

3. Typical application scenarios

1. Heavy Industrial Welding :

   • Shipbuilding, pressure vessel welding and other operations that require long-term high temperature protection.

2. Precision equipment isolation :

   • Cover precision instruments and electronic components to prevent damage from heat radiation.

3. High-risk environment work :

   • Places where flammable and explosive gases exist, such as petrochemical industry, nuclear power plants, etc.

4. Aerospace :

   • Thermal insulation barrier for rocket engine welding and high temperature component testing.

4. Purchase and Use Guide

1. Key parameters :

   • Thickness : Commonly 0.8~1.5mm, choose according to the spark intensity.

   • Coating : Available in aluminum foil (reflects radiant heat) or silicone (water and oil repellent).

   • Certification : Required to comply with EN ISO 11611 (welding protection) or ASTM D6413 (flame retardant testing).

2. Installation and Maintenance :

   • Fixing method : Use high temperature resistant metal clips or ceramic hooks to avoid melting of plastic parts.

   • Cleaning : Use compressed air to blow away spark residues on the surface, and stains can be wiped off with a neutral detergent.

   • Inspection : Check the ablation points regularly. If the local carbonization area exceeds 10%, it needs to be replaced.

3. Note :

   • Avoid direct friction with sharp metal tools to prevent fiber breakage.

   • Keep away from strong acid/alkali environment during storage to prevent chemical corrosion.

   • It cannot replace full body protective equipment and must be used with welding mask and fireproof clothing.

5. Frequently Asked Questions

• Q: What is the difference between high silica fireproof cloth and ceramic fiber cloth?
  A: High silica fiber is lighter, more flexible, and has a higher upper temperature limit (1600℃ vs 1260℃), but ceramic fiber cloth has slightly better long-term stability at ultra-high temperatures.

• Q: Can it be directly exposed to flames?
  A: It can be exposed to open flames for a short time (such as extinguishing an initial fire), but prolonged burning will cause the fiber to gradually pulverize.

• Q: Is it expensive?
  A: The cost is higher than that of ordinary glass fiber cloth, but lower than that of ceramic fiber cloth. The cost performance is outstanding in high temperature scenes.

VI. Conclusion

High-silica fiber welding fireproof cloth has become the preferred protective material for heavy industry and high-risk environment welding due to its ultra-high temperature tolerance , lightweight design and long life . Reasonable selection (thickness, coating) and standardized maintenance can maximize its protective effectiveness and reduce the risk of fire and heat damage.

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