Polyurethane Blogs

As long as you choose spray-applied rigid all-water polyurethane from a reliable manufacturer, it is completely feasible, safe, and reliable for cold storage insulation applications — you can select it with confidence. Recommendations by Temperature Range: Cold Storage Type Temperature Range Recommended Specification Standard cold storage -18°C ~ -20°C High structural strength all-water PU, output yield 22–24 m³ Low-temperature cold storage Below -40°C High-strength formulation, output yield 20–22 m³ Constant temperature storage Above -5°C Any Lingdian New Materials all-water PU product series

Yes, it can be washed, but act quickly. Once all-water polyurethane fully cures, it becomes virtually insoluble and can only be removed mechanically. Best window: Uncured (within 30 minutes) Use any of the following methods: A. Dishwashing liquid + warm water + brush (safest) Uncured all-water PU is highly viscous but can be softened by surfactants + hot water. Steps: Most workwear-friendly option. B. Alcohol (75% or 95%) — swells polyurethane surface Not-fully-cured water-based PU is sensitive to alcohols. Suitable for: Alcohol-resistant fabrics (cotton, polyester, workwear materials) C. Acetone (powerful — use with caution) Significantly swells uncured PU, but: Semi-cured (1–3 hours) treatment Once all-water PU semi-cures, it becomes tough but hasn’t fully film-formed. You can try:

The water content in all-water polyurethane polyol component is actually very low, typically only around 2–4%. Too much water would cause excessive foaming → resulting in coarse, uneven cell structure and reduced strength, among other issues. So while people may assume all-water polyurethane contains lots of water and should therefore be cheaper, this is not the case. In fact, its cost is higher compared to traditional 141B polyurethane systems.

The short answer is no — higher density does not necessarily mean better insulation performance. A Simple Analogy: The Down Jacket Imagine choosing a down jacket: The Science Behind It The relationship between polyurethane foam density and insulation performance follows this exact principle. Polyurethane foam’s thermal insulation capability depends on how it impedes three heat transfer mechanisms: The cellular structure of the foam is the critical factor. Key Takeaway Therefore, selecting the appropriate polyurethane density for specific application scenarios is essential to achieve optimal thermal insulation performance.