R-NH-COO-R′ network + blowing agent
ChemistryEspuma de poliuretano is specified as R-NH-COO-R′ network + blowing agent. Density band 30–60 kg/m³ rigid boards.
What holds Espuma de poliuretano together is not the nickname. Formula R-NH-COO-R′ network + blowing agent, density 30–60 kg/m³ rigid boards.
Meters are atlas-relative. Grades are the SKUs buyers write.
Fases
Microstructure
OrderProcessing sets grain, crystallinity or fibre orientation — the reason two lots of Espuma de poliuretano can test differently.
Interfaces
SurfacesCoatings, oxide films, sizings or paper faces often decide weather and fire behaviour more than the bulk brochure.
Defects
FlawsInclusions, voids, knots, pinholes or residual stress start the failures that mill certificates do not list.
Grades
VariantsEspuma de poliuretano is a family. Grade names below are the ones buyers actually write on RFQs.
Ageing
TimeMoisture, UV, creep, hydrogen or carbonation shift properties in service. Design to the aged state.
Medidores relativos
Strength20
Strength is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Heat envelope36
Heat envelope is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Fire behaviour28
Fire behaviour is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Insulation88
Insulation is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Workability74
Workability is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Circularity32
Circularity is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Graus
Flexible slabstock
Furniture, auto.Furniture, auto.
Rigid PUR
Appliances.Appliances.
PIR board
Buildings, better fire index.Buildings, better fire index.
Spray closed-cell
Roofs, rim joists.Roofs, rim joists.
Elastofoam
Integral skin.Integral skin.
Ligações
Primary bonding
Espuma de poliuretano holds together by ionic/covalent networks.
Secondary forces
Hydrogen bonds, van der Waals stacks or grain-boundary cohesion set toughness and moisture uptake.
Composites & fills
Fillers, fibres, plasticisers or aggregates are part of the real product, not impurities.
Environment film
Oxides, chars, sizings or paints are the layer the world actually meets.
Change the grade, the coating or the moisture and you have a different material with the same English name.
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Lã mineral
Rocha ou vidro fundidos fiados em painéis A1: o isolamento incombustível padrão.
Geral 69 📦Painel a vácuo
Sanduíche de vácuo selado: λ ~0,004–0,008 até o envelope vazar.
Geral 44 🕯️Material de mudança de fase
Pacotes de calor latente que achatam oscilações. Complemento, não substituto de λ.
Geral 36