GB/T 10801.1 Type I
GB/T 10801.1 Type I is the lowest density and strength class of moulded expanded polystyrene (EPS) board in the GB/T 10801.1 family, supplied at 0.018 g/cm³ with a thermal conductivity of 0.040 W/m·K.
Reference datasheet — GB/T 10801.1 Type I is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the STD-B2 condition
GB/T 10801.1 Type I grades and fills
GB/T 10801.1 Type I is supplied in 4 conditions, soft to hard. STD-B2 is the default FabDigit quotes; the values on this page are for it.
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 | ||
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?
GB/T 10801.1 Type I is the lowest density and strength class of moulded expanded polystyrene (EPS) board in the GB/T 10801.1 family, supplied at 0.018 g/cm³ with a thermal conductivity of 0.040 W/m·K. Engineers specify it where cost per unit of thermal resistance matters more than compressive strength: general building insulation boards, block-cut sheet and protective packaging. It is available with B2 or B1 flame-retardant treatment, as graphite-enhanced GEPS and with recycled content. The material carries almost no load, is attacked by solvents and UV and always needs a facing; move to Type II or III when compressive strength or dimensional stability is critical. GB/T 10801.1 Type I 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). GB/T 10801.1 Type I has a tensile strength of 0.13 MPa (0.0189 ksi), weaker than 98% of polymer grades. Elongation at break is 3% and the elastic modulus is 0 GPa (3.63×10⁻⁴ Msi).
What is GB/T 10801.1 Type I used for?
- Exterior wall insulation
- Roof insulation
- Packaging
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
- Hard to polish — 5/100, worse than 99% of polymer grades
- Absorbs moisture — dry before molding — 2%, worse than 97% of polymer grades
- Degrades in UV without stabilisers — 15/100, worse than 95% of polymer grades
- Low stiffness — 0 GPa (3.63×10⁻⁴ Msi), worse than 93% of polymer grades
- Poor heat conductor — 0.04 W/m·K (0.0231 BTU/hr·ft·°F), worse than 87% of polymer grades
GB/T 10801.1 Type I properties
Typical room-temperature values for GB/T 10801.1 Type I-STD-B2; bars are the position among polymer grades.
Physical4
GB/T 10801.1 Type I 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 has a tensile strength of 0.13 MPa (0.0189 ksi), weaker than 98% of polymer grades. Elongation at break is 3% and the elastic modulus is 0 GPa (3.63×10⁻⁴ Msi).
Thermal9
GB/T 10801.1 Type I is rated for continuous service to 70°C (158 °F). It conducts heat at 0.04 W/m·K (0.0231 BTU/hr·ft·°F), worse than 87% of polymer grades. Thermal expansion is 65 µm/m·K (36.1 µin/in·°F).
Electrical6
GB/T 10801.1 Type I is an electrical insulator with a dielectric strength of 2.2 kV/mm (55.9 V/mil) and a resistivity of 1×10¹⁴ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (80/100), worse than 52% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of GB/T 10801.1 Type I 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's machinability is excellent (85/100, better than 88% of polymer grades); weldability fair (45/100); formability poor (25/100).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the polymer family
Yield strength against density for every polymer grade FabDigit runs. GB/T 10801.1 Type I is highlighted; hover a dot for its name, or open the interactive family chart.
Working with GB/T 10801.1 Type I
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.
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) |
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.
How much does GB/T 10801.1 Type I cost?
GB/T 10801.1 Type I is a standard-cost polymer ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
GB/T 10801.1 Type I — frequently asked
What is GB/T 10801.1 Type I used for?
GB/T 10801.1 Type I 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?
GB/T 10801.1 Type I has a typical tensile strength of 0.13 MPa (0.0189 ksi) — weaker than 98% of polymer grades. Strength varies by condition: see the 4 listed tempers.
Is GB/T 10801.1 Type I 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 be welded?
With care — weldability is rated fair (45/100). 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?
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 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?
GB/T 10801.1 Type I 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.
How much does GB/T 10801.1 Type I cost?
GB/T 10801.1 Type I is a standard-cost polymer ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.