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When selecting a filtering device, a number of factors that can not be defined a priori and which can only be deduced from a correct and accurate risk analysis, must be considered.
The type of application, concentration, temperature, humidity, olfactory threshold, and individuality of the operator are just some of the aspects that contribute to the correct choice of the filter device.

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Substance Name	CAS Number	Formula	B.P.°C	Filter	Olfactory Threshold mg/m3	TLV mg/m3	TLV PPM	Physiological Action
Butyl alcohol (n-)	75-65-0	C4H10O	99,5	A	219	303	100	Narcotic, dermatitis, liver damage and eyes
Acrylonitrile	107-13-1	C3H3N	77,3	A B	8,1	4,3	2	Highly toxic, headache, convulsions, dizziness, suspect carinogen
Ethanol	64-17-5	C2H6O	78,3	A	0,34	1880	1000	Irritating eyes and respiratory tract
Acrolein	107-02-8	C3H4O	52,5	A	0,05	0,23 C	0,1 C	Irritating eyes and respiratory tract
Furfuryl alcohol	98-00-0	C5H6O2	171	A	32	40	10	Poison, high toxicity
Isoamyl alcohol	137-32-6	C5H12O	116	A	25,2	361	100	Irritating eyes and respiratory tract
Isopropyl alcohol	67-63-0	C3H8O	80,3	A	7,84	983	400	Irritating , eyes damages, narcotic
Carbon tetrachloride	56-23-5	CCl4	76,8	A	60	31	5	Headache, vomiting, dizziness, liver disorders
Methyl alcohol	67-56-1	CH4O	64,5	AX	13,11	262	200	Harmful nervous system, optic nerve, liver. Dermatitis, nausea
Asbestos	1332-21-4	-	-	P3	-	-	0,2	carcinogen
Ketene	463-51-4	C2H2O	-56	AX	-	0,86	0,50	Irritating, pulmonary edema
Ammonia	7664-41-7	NH3	-33,3	K	0,026	17	25	Irritating eyes and respiratory tract, bronchitis edema
Cyanogen	57-12-5	CN-	-21	B	500	21	10	Irritating mucous membranes, headache, nausea. Mortal
Cyclohexane	110-82-7	C6H12	80,7	A	1,43	1030	300	Irritating to the skin
Arsenic anhydride	1327-53-3	As2O3	-	BP3	-	0,01	-	carcinogen
cyclohexanol	108-93-0	C6H12O	161,5	A	400	206	50	narcotic. It damages kidneys, liver, blood vessels
Carbon dioxide	124-38-9	CO2	-	***	-	9000	5000	asphyxiating
Cyclohexanone	108-94-1	C6H10O	155,6	A	0,48	100	25	Poor, narcotic, irritant
Phthalic anhydride	85-44-9	C8H4O3	295	AP3	-	6,1	1	Irritating mucous membranes and cornea
Maleic anhydride	108-31-6	C4H2O3	202	A	1,84	1	0,25	Burns skin and eyes, pulmonary edema

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