Optical Density of Smoke (ASTM E 662 - room NBS)

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OPTICAL DENSITY OF SMOKE

Optical Density of Smoke (ASTM E 662 - NBS Chamber)

Description of test method:

The test is carried out in a constant-condition fume cupboard by introducing the material on a suitable sample dish and heating from beneath with a small electric furnace (smouldering conditions) or with the same furnace together with a small ignition flame (flaming conditions).
The small furnace is set so that the sample receives 2.5 W/cm2 thermal energy.
The light transmission through the smoke, resulting from the burning or combustion of the sample, is detected by a photocell which senses a vertical beam of light passing trough the smoke.
The amount of light transmission passed during the test is expressed as the specific optical density value.

LATI Materials Certified:

Certificate issued in date:	12/05/89		12/05/89		12/05/89		12/05/89		23/07/91
	LATENE 3 H2W-V0		LATAMID 68 H2-V0		LATAMID 66 H2 G/25-V0KB1		LATILON 28D G/30		KELON B FR H2 CEG/500 -V0CT3
	Smould.	Flaming.	Smould.	Flaming.	Smould.	Flaming.	Smould.	Flaming.	Flaming.
Maximum specific optical density (Dm)	567	430	79	155	5	279	35	188	238
Time ( to reach Dm)	18:00	12:00	17:00	10:00	18:00	18:00	19:00	19:00	17:00
Corrected maximum specific optical density	552	427	72	132	1	272	33	182	201
Specific optical density at 90 secs	19	54	10	6	2	8	2	6	1
Specific optical density at 4 mins	224	219	32	80	3	31	4	9	4
Weight loss %	42	38	30	91	3	15	16	16	4

Note: Tests carried out on the account of LATI by CSI Lab. - Viale Lombardia, 20 - 20121 BOLLATE (MI)

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