Expandable graphite (EG) is a game-changing, halogen-free additive that delivers outstanding flame retardancy, thermal insulation, and chemical resistance across polymers, building materials, and sealing applications. Qingdao Xinghe Graphite Co., Ltd. pro

1. Introduction to Expandable Graphite

Expandable graphite is a natural flake graphite chemically intercalated with acid molecules. These intercalants vaporize upon heating (180–300 °C), forcing the graphite layers apart and creating a worm-like expanded char up to 200× its original volume. This intumescent behavior forms a robust, lightweight barrier that:

• Suppresses flame spread through tortuous char layers

• Reduces heat transfer with low thermal conductivity

• Resists chemicals in harsh environments

2. Core Technical Specifications

3. High-Impact Applications

3.1 Halogen-Free Flame-Retardant Polymers

• Intumescent Coatings: EG in epoxy, polyurethane, and silicone systems yields rapid expansion, lowering peak heat release and smoke density.

  
  

3.2 Fire-Resistant Construction Materials

• Insulation Panels & Boards: Lightweight EG-filled composites resist fire spread while maintaining structural integrity under extreme heat.

• Ceiling & Partition Systems: Improved fire ratings (EI20–EI120) with minimal thickness.

3.3 High-Temperature Sealing & Gaskets

• Expanded Graphite Sheets & Rings: Gas-tight, corrosion-resistant seals for furnace doors, heat exchangers, and automotive exhaust systems.

3.4 EMI/RFI Shielding Components

• Conductive Foams & Gaskets: Leverage EG’s electrical conductivity for lightweight electromagnetic interference protection in electronics and telecom enclosures.

4. Why Partner with Qingdao Xinghe Graphite

• Vertically Integrated Supply Chain

  
  

• Mine → Intercalation → Expansion → Micronization → Packaging

  
  

• Ensures consistent quality, traceability, and cost efficiency.

Tailored EG Grades

Ultra-high expansion (>350 ml/g)

Custom flake size distributions (100–300 µm)

Surface-modified options for enhanced compatibility




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  Rigorous Quality Control




ISO 9001:2015 certified

Batch-by-batch testing: expansion ratio, onset temperature, ash content




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  Global Technical Support




Application engineering for formulation optimization




• Fast sample delivery and scale-up trials

Distributors in 90+ countries

5. Best Practices for Formulators

• Dispersion Techniques: Use masterbatch or direct loading; consider pre-wetting EG with compatible surfactants.

  
  

• Processing Temperatures: Ensure heating profile (180–300 °C) matches EG onset; avoid premature expansion in extruders.

  
  

• Synergistic Additives: Combine EG with melamine-based intumescents or phosphorus compounds for enhanced char strength.

6. Conclusion & Next Steps

Expandable graphite represents a sustainable, high-performance solution for modern fire safety and thermal management challenges. By collaborating with Qingdao Xinghe Graphite Co., Ltd., you gain access to industry-leading EG expertise, customizable product lines, and end-to-end technical support.

Action Items:

• Download detailed Technical Data Sheets:
  www.graphitezone.com/

• Request Free Samples: John#graphitezone.com

• Speak with our Application Engineers: +86-186-6398-7730

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Elevate your products with the unmatched performance of Qingdao Xinghe’s expandable graphite.

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