Sell Poly Urethane Foam Rigid Pint x Pint Set best price

A rigid foam used as a core material for cold process insulation, flat panel and is also used for pattern making because it is sandable. Abstract In an effort to create an environmentally-friendly flame retardant system for rigid polyisocyanurate-polyurethane foams, expandable graphite (EG) combined with aluminum hydroxide (ATH) was firstly used to effectively improve the flame retardancy. Limited oxygen index (LOI) increased to 84.2 with an incorporation of 24 phr (parts per hundred of matrix) EG and 50 phr ATH into the matrix. Based on scanning electronic microscopy observation and thermogravimetric analysis, it was speculated that ATH could effectively induce “villi” like particles on the surface of EG, which made the intumescent char denser. The compact char layer could effectively impede the bubbles and heat transport. ATH and EG accelerated the initial degradation and fluffy char was quickly generated on the surface, which results in the slowed down degradation products of the composite and the delayed diffusion of volatile combustible fragments to flame zone. Density The density of rigid polyurethane foam (PUR/PIR) used for thermal insulation in buildings normally ranges between 30 kg/m³ and 45 kg/m³. However, it can reach 100 kg/m³ for some applications. For special applications that are subject to extreme mechanical loads, the density of the rigid polyurethane foam (PUR/PIR) can be increased to 700 kg/m³. Only a small portion of the rigid polyurethane foam volume consists of solid material. At a density of 30 kg/m³ usual in building applications, the solid plastic material makes up only 3% of the volume. This material forms a grid of cell struts and cell walls that can withstand mechanical loads due to its rigidity and anti- buckling properties.