Polymer
GB/T 10801.2 XPS300
Properties, grades, machining, finishes and uses — values shown for the B1 condition.
GB/T 10801.2 XPS300 is a rigid closed-cell extruded polystyrene (XPS) board rated at 300 kPa compressive strength, with a declared thermal conductivity of 0.029 W/(m·K).
Reference datasheet — GB/T 10801.2 XPS300 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.
What is GB/T 10801.2 XPS300?
GB/T 10801.2 XPS300 is a rigid closed-cell extruded polystyrene (XPS) board rated at 300 kPa compressive strength, with a declared thermal conductivity of 0.029 W/(m·K). Engineers specify it where the insulation layer carries moderate structural load, and it is supplied as extruded board in B1 or B2 fire classes with CO2- or HFC-blown variants and square, shiplap or grooved edges. It cannot be melt-welded, is degraded by UV, and is attacked by aromatic-solvent adhesives, so faces must be rendered or covered. Move up to XPS500 where traffic or fill loads are higher. GB/T 10801.2 XPS300 has a density of 0.04 g/cm³ (0.0013 lb/in³), lighter than 92% of polymer grades. Its glass-transition temperature is 100°C (212 °F). GB/T 10801.2 XPS300 has a tensile strength of 0.5 MPa (0.0725 ksi), weaker than 89% of polymer grades. The elastic modulus is 0.01 GPa (0.002 Msi).
What is GB/T 10801.2 XPS300 used for?
- Under-slab foundation insulation
- Parking deck insulation
- Inverted (protected-membrane) roof boards
- Perimeter and frost-wall insulation
- Cold storage floor insulation
- Render-carrier boards on exterior walls
- Floor-heating substrate panels
Advantages
- Easy to machine — 95/100, better than 100% of polymer grades
- Lightweight — 0.04 g/cm³ (0.0013 lb/in³), better than 92% of polymer grades
Limitations
- Poor heat conductor — 0.03 W/m·K (0.0168 BTU/hr·ft·°F), worse than 98% of polymer grades
- Degrades in UV without stabilisers — 15/100, worse than 95% of polymer grades
- High embodied carbon — 8 kg CO₂/kg, worse than 83% of polymer grades
- Low stiffness — 0.01 GPa (0.002 Msi), worse than 79% of polymer grades
- Difficult to weld — 20/100, worse than 78% of polymer grades
GB/T 10801.2 XPS300 properties
Typical room-temperature values for GB/T 10801.2 XPS300-B1 (default selection for internal and external building insulation, underfloor heating and roofing: the polymeric brominated flame retardant meets gb 8624 b1 (class b/c) at 0.029 w/m·k), compiled from standards, handbooks and producer data. Each bar shows where the value sits among the polymer grades in FabDigit's library — further right is higher. Other conditions have their own pages: see tempers.
Physical4
GB/T 10801.2 XPS300 has a density of 0.04 g/cm³ (0.0013 lb/in³), lighter than 92% of polymer grades. Its glass-transition temperature is 100°C (212 °F).
Mechanical8
GB/T 10801.2 XPS300 has a tensile strength of 0.5 MPa (0.0725 ksi), weaker than 89% of polymer grades. The elastic modulus is 0.01 GPa (0.002 Msi).
Thermal8
GB/T 10801.2 XPS300 is rated for continuous service to 75°C (167 °F). It conducts heat at 0.03 W/m·K (0.0168 BTU/hr·ft·°F), worse than 98% of polymer grades. Thermal expansion is 70 µm/m·K (38.9 µin/in·°F).
Electrical4
GB/T 10801.2 XPS300 has an electrical resistivity of 1×10¹⁴ Ω·m.
Chemical & Environmental2
UV resistance is poor.
Sustainability4
Producing a kilogram of GB/T 10801.2 XPS300 takes about 100 MJ of energy and emits 8 kg of CO₂ — less than 61% of polymer grades. Typical recycled content is 15%.
Manufacturability4
GB/T 10801.2 XPS300's machinability is excellent (95/100, better than 100% of polymer grades); weldability poor (20/100); 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.
GB/T 10801.2 XPS300 grades and fills
GB/T 10801.2 XPS300 is supplied in 7 conditions, each with its own property set. Open one for its full datasheet. B1 is what FabDigit quotes unless the drawing says otherwise.
6 further conditions are listed below with a summary only.
| Condition | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
B1Default flame-retardant grade (GB 8624 B /B1) | Default selection for internal and external building insulation, underfloor heating and roofing: the polymeric brominated flame retardant meets GB 8624 B1 (class B/C) at 0.029 W/m·K. | — | — | — | — | 0.03 W/m·K |
ordinary (low flame-retardant) grade | Pick the cheaper ordinary grade only where B1 is not enforced — cold-store interlayers, packaging and underground frost-protection layers outside external wall insulation. | — | — | — | — | — |
with extrusion skin retained | Keep the extruded skin for inverted roofs and below-grade walls: it delivers the best conductivity (0.028 W/m·K) and lowest water absorption in permanently damp service at 36 kg/m³. | — | — | — | — | 0.03 W/m·K |
skinless / surface-planed or grooved | Choose the skinless, planed or grooved board for thin-render external wall systems, where bond strength to the adhesive mortar outweighs the rise in conductivity to 0.031 W/m·K. | — | — | — | — | 0.03 W/m·K |
CO2-blown (HFC/HCFC-free) | Specify the CO₂/co-blowing-agent foam, now the mainstream product, for ODP=0 and low GWP, accepting a slightly higher conductivity of 0.030 W/m·K than fluorinated blowing agents. | — | — | — | — | 0.03 W/m·K |
HFC/HCFC-blown (legacy low-lambda) | Use only for legacy products or special export specifications chasing the lowest initial conductivity of 0.027 W/m·K; the high-GWP blowing agents are being phased out domestically. | — | — | — | — | 0.03 W/m·K |
Underfloor-heating board (grooved / foil-faced) | Pick the stud-embossed or grooved board laminated with aluminium foil or EPE for hydronic underfloor heating, where it fixes the pipe loop and carries the screed and floor loads up to 70 °C. | — | — | — | — | — |
Working with GB/T 10801.2 XPS300
Is GB/T 10801.2 XPS300 easy to machine?
Hot wire, saw blade or utility knife all cut it at high speed, and grooving or routing needs no coolant. Excessive hot-wire temperature generates fumes, so ventilate the cutting area.
Can GB/T 10801.2 XPS300 be welded?
Not fusion weldable; seal board joints with polyurethane foam adhesive, water-based or solvent-free adhesive, or dedicated jointing tape. Do not use adhesives containing aromatic solvents.
Can GB/T 10801.2 XPS300 be formed, bent or molded?
Geometry is set on the extrusion foaming line, so finished board can only be cut and grooved. The rigid foam has a large minimum cold-bend radius and cracks readily when bent, so produce contoured parts by CNC cutting.
Strength versus weight in the polymer family
Yield strength against density for every polymer grade FabDigit runs. GB/T 10801.2 XPS300 is highlighted; hover a dot for its name, or open the interactive family chart.
GB/T 10801.2 XPS300 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 |
|---|---|---|
| blowing agent (CO2 / co-blowing agentresidual blowing gas in closed cells | 1 – 4 | 2.5 |
| flame retardant ( PolyFR, HBCD)required for class B1; can be reduced for class B2 | 0.5 – 2.5 | 1.2 |
| nucleating agent (talc )controls cell size | 0.2 – 1 | 0.5 |
| pigment /used for brand identification | 0.05 – 0.5 | 0.2 |
| polystyrene (PS, PS)mainly general-purpose or high-flow GPPS | ≥ 92 (balance) | — |
What surface finishes work on GB/T 10801.2 XPS300?
Scarify or groove the surface, or apply a bonding primer, before troweling polymer mortar over glass-fibre mesh. Do not leave it exposed to UV for long periods; exposed faces must be coated or shielded.
How much does GB/T 10801.2 XPS300 cost?
GB/T 10801.2 XPS300 is a standard-cost polymer ($$), cheaper than about 72% 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 10801.2 XPS300 — frequently asked
What is GB/T 10801.2 XPS300 used for?
GB/T 10801.2 XPS300 is typically used for under-slab foundation insulation, parking deck insulation, inverted (protected-membrane) roof boards, perimeter and frost-wall insulation, cold storage floor insulation and render-carrier boards on exterior walls. In short: mid-load structural XPS; 300 kPa load class; 0.029 W/mK conductivity.
What is the tensile strength of GB/T 10801.2 XPS300?
GB/T 10801.2 XPS300 has a typical tensile strength of 0.5 MPa (0.0725 ksi) — weaker than 89% of polymer grades. Strength varies by condition: see the 7 listed tempers.
Is GB/T 10801.2 XPS300 easy to machine?
Yes — machinability is rated excellent (95/100, better than 100% of polymer grades). Hot wire, saw blade or utility knife all cut it at high speed, and grooving or routing needs no coolant. Excessive hot-wire temperature generates fumes, so ventilate the cutting area.
Can GB/T 10801.2 XPS300 be welded?
Not readily — weldability is rated poor (20/100). Not fusion weldable; seal board joints with polyurethane foam adhesive, water-based or solvent-free adhesive, or dedicated jointing tape. Do not use adhesives containing aromatic solvents.
What surface finishes work on GB/T 10801.2 XPS300?
Scarify or groove the surface, or apply a bonding primer, before troweling polymer mortar over glass-fibre mesh. Do not leave it exposed to UV for long periods; exposed faces must be coated or shielded.
Can GB/T 10801.2 XPS300 be formed, bent or molded?
Geometry is set on the extrusion foaming line, so finished board can only be cut and grooved. The rigid foam has a large minimum cold-bend radius and cracks readily when bent, so produce contoured parts by CNC cutting.
What is the maximum service temperature of GB/T 10801.2 XPS300?
GB/T 10801.2 XPS300 is rated for continuous use to about 75°C (167 °F), and briefly to 85°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does GB/T 10801.2 XPS300 cost?
GB/T 10801.2 XPS300 is a standard-cost polymer ($$), cheaper than about 72% 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
- ASM Engineered Materials Handbook, Vol. 2 — Engineering Plastics (PS foams) — ASM International (1988)
- ICE / EPD XPS insulation board — University of Bath / EPD Programmes (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.