PURL-Si30

TYPICAL USES/APPLICATIONS

• Rapid cavity filling
• Strata consolidation

BENEFITS OF SODIUM ILICA FOAMS VS PU FOAMS

• Fire Resistance & Non-Combustibility
  Sodium silicate foams are inorganic and non-combustible, making them highly fire-resistant.
  In contrast, PU foams are organic and can be flammable, producing toxic fumes like hydrogen cyanide and isocyanates when burned.Fire safety regulations in underground mining often favor non-combustible materials, giving sodium silicate a clear advantage.
• Cost-Effectiveness
  Sodium silicate foams are generally cheaper than PU foams, both in raw material cost and processing.
  For large-scale void filling where material volume is high, this cost difference becomes significant.
• Environmental and Health Considerations
  Sodium silicate foams are more environmentally benign and have low toxicity.
  PU foams involve isocyanates, which can pose health risks to workers if proper PPE and ventilation aren’t used.Sodium silicate foams are often easier to handle in underground environments (Mines or confined work environments) without complex ventilation systems.
• Structural Fill vs. Strength
  Sodium silicate foams are mainly used for mass void filling, cavity isolation, or backfilling—where strength is secondary to volume and stability.
  PU foams, especially rigid ones, may offer higher compressive strength and are often used for localized support, injection grouting, or structural reinforcement.In many cases, the lighter density and expansion characteristics of sodium silicate foam are more suitable for simply displacing air and stabilizing large cavities.
• Compatibility with Wet Conditions
  Sodium silicate foams can tolerate wet or damp environments better.They set and cure even in the presence of water, which is common in underground mines.

  PU foams may have performance issues in high-moisture or waterlogged conditions, or require additional drying time or surface prep.