GB/T 10801.1 Type III SEPS-GRAPHITE
Additive grade
Choose the graphite-modified grey board when insulation thickness is limited: infrared absorbers cut radiant heat transfer, lowering conductivity by 10–15% to 0.032 W/m·K at the same density.
Values for the SEPS-GRAPHITE condition
Other GB/T 10801.1 Type III grades and fills
GB/T 10801.1 Type III is listed in 3 conditions; see the grade overview at GB/T 10801.1 Type III.
Compare all 3 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
SEPS-GRAPHITEThis page graphite (infrared-absorber) modified EPS, grey-black | Choose the graphite-modified grey board when insulation thickness is limited: infrared absorbers cut radiant heat transfer, lowering conductivity by 10–15% to 0.032 W/m·K at the same density. | — | 0.26 | 1.6 | — |
GB 8624 B1 | Use on high-rise or fire-critical external wall insulation calling for GB 8624 B1; the higher retardant loading still has to be combined with fire barrier bands and a crack-resistant render. | — | 0.28 | 1.8 | — |
GB 8624 B2 | Pick for ordinary building insulation: the polymeric brominated flame retardant gives an oxygen index of at least 30% and meets GB 8624 B2 for common external wall constructions. | — | 0.29 | 2 | — |
What is GB/T 10801.1 Type III SEPS-GRAPHITE?
GB/T 10801.1 Type III SEPS-GRAPHITE is GB/T 10801.1 Type III in the SEPS-GRAPHITE grade — choose the graphite-modified grey board when insulation thickness is limited: infrared absorbers cut radiant heat transfer, lowering conductivity by 10–15% to 0.032 W/m·K at the same density. GB/T 10801.1 Type III SEPS-GRAPHITE has a tensile strength of 0.26 MPa (0.0377 ksi), weaker than 94% of polymer grades. Elongation at break is 1.6% and the elastic modulus is 0.01 GPa (0.0014 Msi). GB/T 10801.1 Type III SEPS-GRAPHITE has a density of 0.03 g/cm³ (0.0011 lb/in³), lighter than 94% of polymer grades. Its glass-transition temperature is 100°C (212 °F).
Advantages
- Lightweight — 0.03 g/cm³ (0.0011 lb/in³), better than 94% of polymer grades
- Easy to machine — 82/100, better than 86% of polymer grades
Limitations
- Limited ductility — 1.6%, worse than 97% of polymer grades
- Poor heat conductor — 0.03 W/m·K (0.0185 BTU/hr·ft·°F), worse than 96% of polymer grades
- Degrades in UV without stabilisers — 15/100, worse than 95% of polymer grades
- Absorbs moisture — dry before molding — 1.5%, worse than 91% of polymer grades
- Low stiffness — 0.01 GPa (0.0014 Msi), worse than 81% of polymer grades
GB/T 10801.1 Type III SEPS-GRAPHITE properties
Typical room-temperature values for GB/T 10801.1 Type III SEPS-GRAPHITE; 20 are specific to this condition. Other listed values are GB/T 10801.1 Type III reference data and may not represent this condition. Bars are the position among polymer grades.
Physical4
GB/T 10801.1 Type III SEPS-GRAPHITE has a density of 0.03 g/cm³ (0.0011 lb/in³), lighter than 94% of polymer grades. Its glass-transition temperature is 100°C (212 °F).
Mechanical8
GB/T 10801.1 Type III SEPS-GRAPHITE has a tensile strength of 0.26 MPa (0.0377 ksi), weaker than 94% of polymer grades. Elongation at break is 1.6% and the elastic modulus is 0.01 GPa (0.0014 Msi).
Thermal8
GB/T 10801.1 Type III SEPS-GRAPHITE is rated for continuous service to 70°C (158 °F). It conducts heat at 0.03 W/m·K (0.0185 BTU/hr·ft·°F), worse than 96% of polymer grades. Thermal expansion is 65 µm/m·K (36.1 µin/in·°F).
Electrical4
GB/T 10801.1 Type III SEPS-GRAPHITE has an electrical resistivity of 1×10¹³ Ω·m.
Chemical & Environmental2
UV resistance is poor.
Sustainability4
Producing a kilogram of GB/T 10801.1 Type III SEPS-GRAPHITE takes about 105 MJ of energy and emits 3.6 kg of CO₂ — more than 54% of polymer grades. Typical recycled content is 5%.
Manufacturability3
GB/T 10801.1 Type III SEPS-GRAPHITE's machinability is very good (82/100, better than 86% of polymer grades); weldability poor (25/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with GB/T 10801.1 Type III SEPS-GRAPHITE
Is GB/T 10801.1 Type III easy to machine?
Electric hot-wire cutting is the most economical route and leaves a smooth section; band sawing or high-speed milling is possible but produces large amounts of static-clinging debris, so use dust extraction and avoid melt-smearing.
Can GB/T 10801.1 Type III be welded?
Cannot be conventionally melt-welded. Joints rely on steam re-fusion or local hot-plate/hot-air fusion; in construction, water-based EPS adhesive or polyurethane foam adhesive is normally used instead.
Can GB/T 10801.1 Type III be formed, bent or molded?
Pre-expanded beads are fused in-mould with steam at roughly 0.06–0.12 MPa and 110–120 °C into large blocks, aged, then sawn to size. Product must be aged 28 days, or force-aged, to control post-shrinkage (dimensional stability ≤2%).
What surface finishes work on GB/T 10801.1 Type III?
Exposed faces need crack-resistant mortar plus mesh cloth, or a metal or cement board facing. Do not allow solvent-based coatings or solvent-based bitumen waterproofing to contact the foam, and confirm coating compatibility with polystyrene before spraying.
GB/T 10801.1 Type III 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 |
|---|---|---|
| pentanemostly escapes after ageing; residual level affects flammability | 0.3 – 2 | 0.8 |
| brominated polymeric flame retardantflame-retardant types only; HBCD replaced by polymeric Br FR | 0.5 – 2 | 1 |
| graphitegraphite-modified (SEPS) grey board only | 1 – 4 | 2.5 |
| polystyrene ( EPS )pre-expanded pentane-blown EPS beads, steam-moulded and fused | ≥ 94 (balance) | — |
GB/T 10801.1 Type III SEPS-GRAPHITE — frequently asked
What is GB/T 10801.1 Type III SEPS-GRAPHITE used for?
GB/T 10801.1 Type III SEPS-GRAPHITE is typically used for cold storage panels, structural insulated panels and road embankment fill. In short: higher-density EPS class; geofoam-capable grade; load-bearing insulation board.
What is the tensile strength of GB/T 10801.1 Type III SEPS-GRAPHITE?
GB/T 10801.1 Type III SEPS-GRAPHITE has a typical tensile strength of 0.26 MPa (0.0377 ksi) — weaker than 94% of polymer grades. Strength varies by condition: see the 3 listed tempers.
Is GB/T 10801.1 Type III SEPS-GRAPHITE easy to machine?
Yes — machinability is rated very good (82/100, better than 86% of polymer grades). Electric hot-wire cutting is the most economical route and leaves a smooth section; band sawing or high-speed milling is possible but produces large amounts of static-clinging debris, so use dust extraction and avoid melt-smearing.
Can GB/T 10801.1 Type III SEPS-GRAPHITE be welded?
Not readily — weldability is rated poor (25/100). Cannot be conventionally melt-welded. Joints rely on steam re-fusion or local hot-plate/hot-air fusion; in construction, water-based EPS adhesive or polyurethane foam adhesive is normally used instead.
What surface finishes work on GB/T 10801.1 Type III SEPS-GRAPHITE?
Exposed faces need crack-resistant mortar plus mesh cloth, or a metal or cement board facing. Do not allow solvent-based coatings or solvent-based bitumen waterproofing to contact the foam, and confirm coating compatibility with polystyrene before spraying.
Can GB/T 10801.1 Type III SEPS-GRAPHITE be formed, bent or molded?
Pre-expanded beads are fused in-mould with steam at roughly 0.06–0.12 MPa and 110–120 °C into large blocks, aged, then sawn to size. Product must be aged 28 days, or force-aged, to control post-shrinkage (dimensional stability ≤2%).
What is the maximum service temperature of GB/T 10801.1 Type III SEPS-GRAPHITE?
GB/T 10801.1 Type III SEPS-GRAPHITE is rated for continuous use to about 70°C (158 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 13163 Thermal insulation products — Factory made EPS — CEN (2016)
- ASM Engineered Materials Handbook, Vol. 2: Engineering Plastics — ASM International (1988)
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.