600 kg/m³ Ultra-High Density Polyurethane Insulation Blocks: Still the Hardcore Choice in 2025

600 kg/m³ Ultra-High Density Polyurethane Insulation Blocks: A "Hardcore Performer" Still in Use in 2025

After 12 years working with insulation materials, the question I get most often from clients is: “Is there one material that delivers real strength, excellent insulation, and true waterproofing?”

The answer lies in one material: ultra-high density rigid polyurethane blocks. And the magic number is ≥600 kg/m³.

Why is 600 kg/m³ the "sufficient" threshold?
Standard PU panel cores are only 35-45 kg/m³—step on them and they crumble. For load-bearing applications like pipe supports, cold storage floors, steel column bases, or curtain wall spacers, ≥600 kg/m³ is essential. Measured compressive strength reaches 1000-1400 psi (~7-10 MPa), so trucks can drive directly over it with no issues. Thermal conductivity is 0.022-0.024 W/(m·K)—over 10% better than ordinary rigid PU foam. Closed-cell rate >95%, 24-hour water absorption <0.5%, completely solving the long-standing swelling problem of rockwool and perlite.

Real Projects I've Handled in 2024-2025

• Dubai Hotel Curtain Wall Support Blocks
  Original: 80 kg/m³ PU + steel support combo. Switched to 600 kg/m³ solid blocks in 2024—single-point load capacity hit 2.8 tons with only 120 mm thickness. Thermal bridging eliminated; measured AC energy consumption dropped 19%.
• JD.com Asia No.1 North China Base (Langfang)
  For -28°C cold storage floor anti-freeze layer: laid 150 mm thick 600 kg/m³ PU blocks directly. 10-ton forklifts drove repeatedly for 3 years—zero subsidence. Floor surface temperature difference controlled within ±0.4°C, saving 36% more electricity than the original perlite solution.
• German Passive House Renovation Project
  Client used our 10 mm aerogel blanket on exterior walls, then 50 mm thick 600 kg/m³ PU blocks as spacers for external curtain wall framing. Overall U-value reached 0.13 W/m²·K, total wall thickness increase only 63 mm, no wasted window openings.

How Do We Address Fire Resistance? (The Biggest Concern)
We offer two grades:

• B1 grade (GB 8624, flame-retardant added) – best cost-performance.
• A grade (inorganic pre-mixed process, ~30% more expensive) – required for high-end projects in Europe and Middle East.

Actual test data (A-grade): open flame for 30 minutes, back surface rise <18°C, smoke density rating SDR <15.

Pitfalls to Avoid When Selecting

• Products claiming “500 kg/m³” often test at 420-450 kg/m³—you can tell by breaking a piece with your hands.
• Always verify compressive strength at 10% deformation in third-party reports—anything below 6 MPa should be rejected.
• For cold storage floors, recommend gradient density: 80 Shore D at ground contact, transitioning to 60 Shore D above to avoid stress concentration.

2025 Price Trends
Current landed price for 600 kg/m³ B1 grade bare blocks: approximately RMB 78-85/m²·cm (based on 10 cm thickness)—up ~12% from 2023 due to MDI raw material costs. Still 35-40% cheaper than imported brands (Aspen, Kingspan).

Want Sample Blocks to Test?
Contact me directly via WeChat/WhatsApp for 1-2 kg free samples (you only pay shipping). This is how we started with over 200 clients worldwide.

Ruibin An
Hebei Woqin Trading Co., Ltd.
WhatsApp / WeChat: +86 139 3392 9092
Email: an@cn-aerogel.com
Website: insulatewool.com