Grey EPS Resin
Graphite-Infused Expandable Polystyrene for Superior Thermal Insulation
High-Performance Grey EPS Insulation
Our Grey EPS is a premium insulation material manufactured by infusing standard expanded polystyrene beads with high-purity graphite particles. The graphite additive enhances thermal performance by reflecting radiant heat, providing up to 20 % better insulation compared to traditional white EPS of similar thickness.
This advanced material is lightweight, durable, moisture resistant, and fully recyclable — making it ideal for sustainable, energy-efficient building solutions.
Grey EPS Suspension Technical Specifications
Typical Properties*
| Grade | Bead Size (mm) | Density (g/l) |
|---|---|---|
| Test Method | ASTM D 1921 | Internal test method |
| G-301 | 1.00 – 1.60 | 14 – 18 |
| G-302 | 0.85 – 1.25 | 16 – 20 |
| G-303 | 0.70 – 0.90 | 18 – 25 |
| G-401 | 0.50 – 0.80 | 22 – 30 |
| G-501 | 0.40 – 0.60 | 25 – 35 |
Grey EPS Suspension Process
The base material for Grey EPS begins with the suspension polymerisation process, where styrene monomers are dispersed in water and polymerised into polystyrene beads under controlled conditions using a suspension agent. This process yields the raw beads that are subsequently expanded into EPS foam.
While suspension polymerisation itself does not produce the grey colour, the incorporation of graphite or carbon black additives during or after the suspension process creates the characteristic grey beads. These additives optimise bead size, distribution, and cell structure, resulting in superior thermal insulation properties for the finished product.
Grey EPS Extrusion
An advanced manufacturing process producing high-performance EPS with enhanced thermal insulation, mechanical strength, and durability. The distinctive grey colour results from graphite particles added during production, which reflect and absorb radiant heat for improved energy efficiency.
How It Works
In the extrusion process, polystyrene beads are expanded using steam and blowing agents, then extruded into uniform shapes or profiles. The addition of graphite or other infrared absorbers reduces thermal conductivity, making Grey EPS up to 20 % more efficient than standard white EPS.
Technical Details — Grey EPS Extrusion
| Item | Standard | Technical Requirement | Typical Value |
|---|---|---|---|
| Shape | — | Ellipsoid or spherical | Spherical |
| Colour | — | Black | Black |
| Blowing agent content (%) | QB/T 4009-2010 | 5.0 – 7.0 | 5.2 – 5.7 |
| 95 % particle size range (mm) | QB/T 4009-2010 | 1.0 – 2.0 | 1.0 – 1.6 |
| Thermal conductivity (W/m·K) | GB/T 10295-2008 | ≤ 0.032 | 0.030 |
| Oxygen index (%) | GB/T 2406.2-2009 | ≥ 30 | 31 |
| Compressive strength (kPa) @ 20 kg/m³ | GB/T 8813-2008 | ≥ 100 | 120 |
| Dimensional stability (%) | GB/T 8811-2008 | ≤ 3 | 0.17 |
| Water vapour transmission (ng/Pa·m·s) | GB/T 2411-1998 | ≤ 4.5 | 3.5 |
| Water absorption by volume (%) | GB/T 8810-2005 | ≤ 4 | 2.9 |
| Bending load at break (N) | GB/T 8812.1-2007 | ≥ 25 | 37 |
Key Features & Benefits of Grey EPS
Performance advantages that set graphite EPS apart from conventional insulation materials.
20 % Better Insulation
Embedded graphite particles reflect and absorb radiant heat, reducing thermal conductivity well below standard white EPS.
Lightweight & Durable
Maintains impressive compressive strength while remaining easy to handle, cut, and install on any job site.
Moisture Proof
Closed-cell foam structure prevents water ingress, safeguarding insulation performance in damp or humid conditions.
Fully Recyclable
Made from recyclable raw materials, supporting green building certifications and circular-economy initiatives.
Additional Benefits
- ✓Superior Thermal Insulation — graphite reflects radiant heat, reducing transfer and enhancing efficiency
- ✓Lightweight & Durable — easy to handle and install while maintaining excellent compressive strength
- ✓Moisture Resistant — closed-cell structure prevents absorption, protecting against mould and decay
- ✓Eco-Friendly — manufactured from recyclable materials, contributing to sustainable building practices
- ✓Cost-Effective — delivers better insulation at comparable or reduced thickness, lowering overall costs
Applications of Grey EPS
Designed for industries that demand maximum thermal efficiency without compromise.
Building Insulation
- Roofs, walls, floors, and foundations
- Residential, commercial, and industrial buildings
- Perimeter and basement insulation systems
Cold Storage & Refrigeration
- Walk-in freezer wall systems
- Temperature-controlled environments
- Refrigerated warehouse insulation
Prefabricated & Modular Construction
- Structural insulated panels (SIPs)
- Lightweight panels without excess weight
- Rapid-assembly modular housing
Underfloor Heating Systems
- Radiant floor insulation layers
- Consistent warm floor maintenance
- Hydronic heating thermal barriers
Why Choose Our Grey EPS?
With enhanced thermal efficiency and robust physical properties, Grey EPS helps reduce energy consumption and carbon footprint while maintaining strength and longevity. It is an excellent choice for builders and architects seeking advanced, sustainable insulation options that meet high-performance standards.
Frequently Asked Questions
Everything you need to know about Grey EPS insulation.
Upgrade to Grey EPS Insulation
Speak with our technical team about graphite-enhanced EPS for reduced thickness, lower energy costs, and green building targets.