Lambda values :: Rockwool Ltd

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Rockwool Ltd > Technical > Properties > Thermal - U Values > Lambda values

Thermal Conductivity Values of Rockwool Products, λ ( W/mK)

Building products
The thermal conductivity (λ value) of Rockwool products at a mean temperature of 10°C is in the range of 0.034 to 0.044 W/mK. The thermal resistance (R value) of a specific product can be found by dividing its thickness in metres by the λ value.

0.034 W/mK	0.035 W/mK	0.036 W/mK	0.037 W/mK	0.038 W/mK
. RW3 . RW5 . HP Partial Fill (40-90mm) . Rainscreen DuoSlab (50&75mm) . Rockliner Slab . Firebatt 2000*	. Flexi Slab (140mm) . RWA45 . RW6 . Rockfall U/lay . Rainscreen DuoSlab (100-150mm) . HP Partial Fill (100mm) . Rockclose . RockReveal	. Rockshield Slab . BeamClad . Fire Barrier	. Cavity Slab . Acoustic Partition Slab	. Flexi Slab (50-120mm) . DuoRock . Rockfloor (Thermal) . Rockfall O/lay
0.039 W/mK	0.040 W/mK	0.042 W/mK	0.043 W/mK	0.044 W/mK
. EnergySaver . Hardrock DD	. Cladding Roll . Acoutic Infill . Rockfloor (Acoustic) . Slimfloor base slab . Rockshield Lamella . Conrock 10*	. Conrock 12.5*	. Blown Loft*	. Roll . Rollbatt

^{* Lambda values 90/90 is lambda 10}Thermal Resistance, R (m²K/W)=Thickness (mm)/(1000 x λ (W/mK))

Industrial products
The thermal conductivity (λ value) of Rockwool products at a mean temperature of 10°C is in the range of 0.034 to 0.044 W/mK. The thermal resistance (R value) of a specific product can be found by dividing its thickness in metres by the λ value.

Mean Temperature (ºC)

	50ºC	100ºC	150ºC	200ºC	250ºC	300ºC	350ºC	400ºC
Slabs
RWA45	0.040	0.050	0.063	0.080
RW3	0.039	0.047	0.058	0.070	0.085
RW5	0.037	0.044	0.054	0.064	0.075	0.088	0.104	0.122
RW6	0.037	0.044	0.051	0.060	0.070	0.081	0.093	0.106
Industrial
Process Pipe Sections	0.037	0.044	0.051	0.060	0.070	0.081	0.093	0.106
Pipe Section Mat	0.037	0.044	0.051	0.060	0.070	0.081	0.093	0.106
Industrial Wired Mat	0.038	0.044	0.054	0.065	0.077	0.091	0.107
H.D. Wired Mat	0.037	0.044	0.052	0.061	0.071	0.082	0.096	0.109
HVAC
H & V Pipe Sections	0.037	0.044	0.052	0.061	0.071	0.082	0.096	0.109
Ductwrap/Ductslab	0.040	0.050	0.063	0.080
Lamella mat	0.043	0.054	0.069	0.092
Marine
Firebatt 825	0.037	0.044	0.053	0.062	0.073	0.086	0.100	0.116

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