Pyrok | Reinforced Cement Bonded Particle Board

Performance Criteria

Flexural Strength	6 - 12mm +/-	13 N/mm2
	14 - 18mm +/-	11.5 N/mm2
	20 - 32mm +/-	10 N/mm2
	36 - 40mm +/-	9.5 N/mm2
	Nominal Density	1250 Kgm2
	Flexural Modulus (GPa) Average	4.8
	Tensile Strength (Perpendicular to surface)	0.6 N/mm2
	Tensile Strength (Parallel to surface)	4.0 N/mm2
	Compressive Strength	15.0 N/mm2
	Durability (Life Expectancy)	30 Years
	Frost Resistance	Meets requirements to BS EN 1328
	Moisture Movement (%) 35 5659 35-B5% RH	0.15
	Moisture Content (ex works)	9% +/- 3%
	Thickness Swelling (%): 24 Hours water immersion	1.5
	Vapour Restivity	175 MN5/gm
	Thermal Expansion (x 10 -E/°C)	11
	Thermal Conductivity (W/mK)	0.23
	Building Regulations Classification	(Approved Document B) Class O
	BS476 Part 7: Surface Spread of Flame	Class 1
	Smoke Generation	Minimal
	Airborne Sound Reduction Rw (dB)	>28
	Surface Ph	11 - 13
	Biological	Unaffected by mould and will not rot Resistant to rodents, termites & other insects

       Minimum radius of curvature of Pyrok

(mm)	6	8	10	12
Minimum Radius	2.7	3.6	4.5	5.4

       Weighted sound reduction indices Rw of Pyrok to BS 5821: Part1 1984

(mm)	6	8	10	12	14	16	18	20	24	28	32	40
Mass (kg/m3)	7.5	10.0	12..5	15.0	17.5	20.0	23.5	25.0	30.0	35.0	40.0	50.0
Rw (dB)	30	31	32	32	32	33	34	34	35	35	36	37