GB/T 10801.1 Type I GEPS
Additive grade
GEPS = graphite-enhanced (grey) EPS
Pick the grey infrared-reflecting graphite beads when a thin layer must reach high efficiency: thermal conductivity falls about 15-20% at the same density.
Values for the GEPS condition
Other GB/T 10801.1 Type I grades and fills
GB/T 10801.1 Type I is listed in 4 conditions; see the grade overview at GB/T 10801.1 Type I.
Compare all 4 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Recycled-content EPS board | Use boards blended with 10-30% recycled EPS regrind for non-load-bearing levelling layers and packaging where lower cost outweighs reduced strength and appearance consistency. | — | 0.1 | 2.5 | — |
Flame-retardant EPS, GB 8624 B1 (B) fire class | Choose the polymeric brominated flame-retardant version with oxygen index of at least 30% when external wall insulation codes mandate the GB 8624 B1 class; service limit is 70 °C. | — | 0.12 | 2.5 | — |
GEPSThis page Graphite-enhanced (grey) EPS | Pick the grey infrared-reflecting graphite beads when a thin layer must reach high efficiency: thermal conductivity falls about 15-20% at the same density. | — | 0.12 | 2.5 | — |
STD-B2Default Standard white EPS, GB 8624 B2 fire class | Use as the lowest-cost general-purpose white board at 18 kg/m³ for packaging, levelling layers and insulation that sits behind a fire-rated construction. | — | 0.13 | 3 | — |
What is GB/T 10801.1 Type I GEPS?
GB/T 10801.1 Type I GEPS is GB/T 10801.1 Type I in the GEPS grade — pick the grey infrared-reflecting graphite beads when a thin layer must reach high efficiency: thermal conductivity falls about 15-20% at the same density. GB/T 10801.1 Type I GEPS has a tensile strength of 0.12 MPa (0.0174 ksi), weaker than 99% of polymer grades. Elongation at break is 2.5% and the elastic modulus is 0 GPa (3.77×10⁻⁴ Msi). GB/T 10801.1 Type I GEPS has a density of 0.02 g/cm³ (6.5×10⁻⁴ lb/in³), lighter than 99% of polymer grades. Its glass-transition temperature is 100°C (212 °F). STD-B2 is the default condition FabDigit quotes; GEPS is available on request or by drawing note.
Advantages
- Lightweight — 0.02 g/cm³ (6.5×10⁻⁴ lb/in³), better than 99% of polymer grades
- Easy to machine — 85/100, better than 88% of polymer grades
Limitations
- Degrades in UV without stabilisers — 10/100, worse than 100% of polymer grades
- Hard to polish — 5/100, worse than 99% of polymer grades
- Absorbs moisture — dry before molding — 2%, worse than 97% of polymer grades
- Poor heat conductor — 0.03 W/m·K (0.0191 BTU/hr·ft·°F), worse than 95% of polymer grades
- Low stiffness — 0 GPa (3.77×10⁻⁴ Msi), worse than 93% of polymer grades
GB/T 10801.1 Type I GEPS properties
Typical room-temperature values for GB/T 10801.1 Type I GEPS; 19 are specific to this condition. Other listed values are GB/T 10801.1 Type I reference data and may not represent this condition. Bars are the position among polymer grades.
Physical4
GB/T 10801.1 Type I GEPS has a density of 0.02 g/cm³ (6.5×10⁻⁴ lb/in³), lighter than 99% of polymer grades. Its glass-transition temperature is 100°C (212 °F).
Mechanical10
GB/T 10801.1 Type I GEPS has a tensile strength of 0.12 MPa (0.0174 ksi), weaker than 99% of polymer grades. Elongation at break is 2.5% and the elastic modulus is 0 GPa (3.77×10⁻⁴ Msi).
Thermal9
GB/T 10801.1 Type I GEPS is rated for continuous service to 70°C (158 °F). It conducts heat at 0.03 W/m·K (0.0191 BTU/hr·ft·°F), worse than 95% of polymer grades. Thermal expansion is 65 µm/m·K (36.1 µin/in·°F).
Electrical6
GB/T 10801.1 Type I GEPS is an electrical insulator with a dielectric strength of 2.2 kV/mm (55.9 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (80/100), worse than 52% of polymer grades. UV resistance is not recommended.
Sustainability4
Producing a kilogram of GB/T 10801.1 Type I GEPS takes about 100 MJ of energy and emits 3.5 kg of CO₂ — less than 61% of polymer grades. Typical recycled content is 5%.
Manufacturability6
GB/T 10801.1 Type I GEPS's machinability is excellent (85/100, better than 88% of polymer grades); weldability fair (40/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with GB/T 10801.1 Type I GEPS
Is GB/T 10801.1 Type I easy to machine?
Resistance hot-wire cutting is the first choice and gives a smooth, chip-free face; band saws, blades and CNC hot-wire all work, while milling produces large amounts of static-clinging debris.
Can GB/T 10801.1 Type I be welded?
There is no melt-welding process; blocks are joined by steam re-fusion, hot-air welding or dedicated EPS adhesives (water-based or polyurethane). Solvent-containing adhesives must not be used.
Can GB/T 10801.1 Type I be formed, bent or molded?
Pre-expanded beads are aged, then re-expanded and fused in a steam mould at roughly 105–120 °C into large blocks, which are cut lengthwise and crosswise into board. Leave 2–3% dimensional allowance for cutting.
What surface finishes work on GB/T 10801.1 Type I?
The surface must be covered with polymer cement mortar plus mesh cloth, or with a panel facing. Use water-based coatings only — solvent-based coatings attack the foam — and keep the material out of direct light in long-term exposed positions.
GB/T 10801.1 Type I chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| pentane (blowing agent, residual)residual blowing agent, gradually lost during curing | 0.2 – 2 | 0.8 |
| brominated polymeric flame retardantflame-retardant (B1) grades only; polymeric Br replaced HBCD | 0 – 1.2 | 0.8 |
| graphitegraphite-modified grey board only | 0 – 4 | 0 |
| processing additives (coating, antistat, | 0.1 – 0.6 | 0.3 |
| polystyrene (styrene homopolymer)expandable polystyrene bead matrix | ≥ 92 (balance) | — |
GB/T 10801.1 Type I GEPS — frequently asked
What is GB/T 10801.1 Type I GEPS used for?
GB/T 10801.1 Type I GEPS is typically used for exterior wall insulation, roof insulation and packaging. In short: lowest-density EPS class; lowest-cost insulation board; packaging-grade EPS.
What is the tensile strength of GB/T 10801.1 Type I GEPS?
GB/T 10801.1 Type I GEPS has a typical tensile strength of 0.12 MPa (0.0174 ksi) — weaker than 99% of polymer grades. Strength varies by condition: see the 4 listed tempers.
Is GB/T 10801.1 Type I GEPS easy to machine?
Yes — machinability is rated excellent (85/100, better than 88% of polymer grades). Resistance hot-wire cutting is the first choice and gives a smooth, chip-free face; band saws, blades and CNC hot-wire all work, while milling produces large amounts of static-clinging debris.
Can GB/T 10801.1 Type I GEPS be welded?
With care — weldability is rated fair (40/100). There is no melt-welding process; blocks are joined by steam re-fusion, hot-air welding or dedicated EPS adhesives (water-based or polyurethane). Solvent-containing adhesives must not be used.
What surface finishes work on GB/T 10801.1 Type I GEPS?
The surface must be covered with polymer cement mortar plus mesh cloth, or with a panel facing. Use water-based coatings only — solvent-based coatings attack the foam — and keep the material out of direct light in long-term exposed positions.
Can GB/T 10801.1 Type I GEPS be formed, bent or molded?
Pre-expanded beads are aged, then re-expanded and fused in a steam mould at roughly 105–120 °C into large blocks, which are cut lengthwise and crosswise into board. Leave 2–3% dimensional allowance for cutting.
What is the maximum service temperature of GB/T 10801.1 Type I GEPS?
GB/T 10801.1 Type I GEPS is rated for continuous use to about 70°C (158 °F), and briefly to 80°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASTM C578 Rigid Cellular Polystyrene Thermal Insulation — ASTM (2022)
- Inventory of Carbon & Energy (ICE) — EPS foam — University of Bath / Circular Ecology (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.