GB/T 10801.1 Type III
GB/T 10801.1 Type III is a higher-density moulded EPS board at 0.031 g/cm³ with a thermal conductivity of 0.036 W/m·K, used where the foam carries load as well as insulating.
Reference datasheet — GB/T 10801.1 Type III 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.
GB/T 10801.1 Type III grades and fills
GB/T 10801.1 Type III is supplied in 3 conditions, soft to hard.
Compare all 3 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
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 |
Supply forms, finishes and certifications
Ways GB/T 10801.1 Type III is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
MESH-PANEL | EPS/ | Supply form |
STDDefault | Ⅲ EPS | Standard supply |
What is GB/T 10801.1 Type III?
GB/T 10801.1 Type III is a higher-density moulded EPS board at 0.031 g/cm³ with a thermal conductivity of 0.036 W/m·K, used where the foam carries load as well as insulating. Typical forms are block-cut boards, graphite-loaded (SEPS) boards and mesh-faced panels in B1 and B2 flame-retardant grades. Against Types I and II it offers higher compressive strength and post-moulding dimensional stability of ≤2% after aging, at higher cost per board. It remains solvent- and UV-sensitive and must be faced; Type IV covers heavier loads. GB/T 10801.1 Type III 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). GB/T 10801.1 Type III has a tensile strength of 0.3 MPa (0.0435 ksi), weaker than 94% of polymer grades. Elongation at break is 2% and the elastic modulus is 0.01 GPa (0.0015 Msi).
What is GB/T 10801.1 Type III used for?
- Cold storage panels
- Structural insulated panels
- Road embankment fill
Advantages
- Lightweight — 0.03 g/cm³ (0.0011 lb/in³), better than 94% of polymer grades
- Easy to machine — 85/100, better than 88% of polymer grades
Limitations
- Limited ductility — 2%, worse than 95% of polymer grades
- Poor heat conductor — 0.04 W/m·K (0.0208 BTU/hr·ft·°F), worse than 92% of polymer grades
- Absorbs moisture — dry before molding — 1.5%, worse than 91% of polymer grades
- Degrades in UV without stabilisers — 20/100, worse than 88% of polymer grades
- Low stiffness — 0.01 GPa (0.0015 Msi), worse than 81% of polymer grades
GB/T 10801.1 Type III properties
Typical room-temperature values; bars are the position among polymer grades.
Physical4
GB/T 10801.1 Type III 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 has a tensile strength of 0.3 MPa (0.0435 ksi), weaker than 94% of polymer grades. Elongation at break is 2% and the elastic modulus is 0.01 GPa (0.0015 Msi).
Thermal8
GB/T 10801.1 Type III is rated for continuous service to 75°C (167 °F). It conducts heat at 0.04 W/m·K (0.0208 BTU/hr·ft·°F), worse than 92% of polymer grades. Thermal expansion is 65 µm/m·K (36.1 µin/in·°F).
Electrical4
GB/T 10801.1 Type III has an electrical resistivity of 1×10¹⁴ Ω·m.
Chemical & Environmental2
UV resistance is poor.
Sustainability4
Producing a kilogram of GB/T 10801.1 Type III 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's machinability is excellent (85/100, better than 88% of polymer grades); weldability poor (25/100); formability poor (20/100).
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 III is highlighted; hover a dot for its name, or open the interactive family chart.
Working with GB/T 10801.1 Type III
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%).
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) |
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.
How much does GB/T 10801.1 Type III cost?
GB/T 10801.1 Type III 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 III — frequently asked
What is GB/T 10801.1 Type III used for?
GB/T 10801.1 Type III 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?
GB/T 10801.1 Type III has a typical tensile strength of 0.3 MPa (0.0435 ksi) — weaker than 94% of polymer grades. Strength varies by condition: see the 3 listed tempers.
Is GB/T 10801.1 Type III easy to machine?
Yes — machinability is rated excellent (85/100, better than 88% 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 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?
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 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?
GB/T 10801.1 Type III is rated for continuous use to about 75°C (167 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does GB/T 10801.1 Type III cost?
GB/T 10801.1 Type III 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
- 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; 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.