Manufacture and Characterization of Heat-Resistant and Heat-Insulating New Composites Based on Resol Resin–Carbon Fibers–Perlite for the Built Heritage Protection

Table 3

Coefficient of thermal conductivity of composite material of phenolic resin– (resite–) carbon fibers–perlite in comparison with other organic thermal-insulating materials.

Material	Polymeric matrix	Additive	Carbon fibers (%) (CF)	Coefficient of thermal conductivity (W/mK)
	Resol (R); Polyurethane (PU) (%)	Perlite (%) (P)
R-CF7.5-P10	90	10	10 ()		0.16
Cured phenolic resin	100	0	0	Typ 31; Τyp 13.5	0.31 [14]; 0.72 [14]
PU	100	0	0	Solid; Foam	0.25 [15]; 0.05 [15]
Extruded polystyrene	100	0	0	DOW	0.035 [16]

or resite, after resol curing. formation groups of phenol-formaldehyde resins with additives. Group I: types for general application (type 31: wood-flour) and group IV: types with increased electrical properties (type 13.5: with mica, i.e., phyllosilicate mineral) [17]. foamed extruded polystyrene as a material with uniform small and closed cells.