What are the raw materials for Rockwool? | FUNAS Guide
Explore the primary raw materials for rockwool, their roles in thermal insulation, and how material selection affects product performance. Expert guidance from FUNAS.
What are the Raw Materials for Rockwool?
Professionals in thermal insulation materials often search for the fundamental components used in rockwool production. Understanding these raw materials is vital for assessing product quality, sourcing, and ensuring compliance with industry standards. Here, we detail the key raw materials for rockwool, offering quick insights for industry experts.
Main Raw Materials Used in Rockwool Production
- Basalt:
- Primary source material; a volcanic igneous rock.
- Chosen for its high melting point (around 1,500°C) and mineral composition.
- Provides excellent temperature resistance and insulation properties.
- Accounts for the majority of the mix (up to 98% in some rockwool products).
- Diabase (Dolomite or Gabbro):
- Acts as a supplementary mineral.
- Balances mineral composition and helps optimize melting characteristics.
- Enhances fiber formation and durability.
- Recycled Slag:
- Byproduct from steel manufacturing, such as blast furnace slag.
- Utilized to improve sustainability and reduce material costs.
- Contributes to the overall mineral makeup, supporting fiber integrity.
- Bauxite or Other Alumina Sources:
- Occasionally incorporated to adjust the alumina content of the mix.
- Ensures desired chemical stability and fiber strength.
- Additives and Binders:
- Phenol-formaldehyde resin commonly used as a binder.
- Small quantities of oils or dust suppressants added to control dust emission and improve product handling.
- Some formulations may integrate hydrophobic agents to enhance water repellency.
Overview of the Rockwool Manufacturing Process
- Raw Material Preparation:
- Mineral rocks and slag are carefully weighed and blended for targeted product specifications.
- Melting:
- The mix is melted at ~1,500°C in a cupola furnace.
- Fiberization:
- The molten blend is spun at high speed to form fibers.
- Binder Application:
- Fibers are coated with a binder to stabilize the mat.
- Curing and Finishing:
- Cured at high temperature, then cut and packaged per application requirements.
Key Considerations for Material Selection
- Thermal Performance:
- High-quality basalt ensures thermal conductivity values between 0.033–0.040 W/m·K.
- Material purity directly impacts insulation efficiency.
- Fire Resistance:
- Inorganic mineral base makes rockwool non-combustible (Euroclass A1 or A2, EN 13501-1).
- Ideal for passive fire protection.
- Environmental Profile:
- Incorporating recycled slag enhances sustainability (see European Insulation Manufacturers Association, EURIMA).
- Compliance:
- Material selection must meet international and regional standards, including ISO 14001 and CE Marking.
Authoritative References
- European Insulation Manufacturers Association (EURIMA):
(https://www.eurima.org/resource-hub/)
- International Standard ISO 14001 on Environmental Management
- EN 13501-1 Fire Classification of Construction Products
For more insights and high-quality rockwool solutions, contact FUNAS—your trusted partner in thermal insulation materials.
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