massproducer
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Well stoney this is far from a flame but I surely do have to disagree with you regarding the Carcinogenicity of butane itself. n-Butane in itself is not a human carcinogenic, in fact in low doses it is actually considered non-toxic to humans. What makes Cheaper unclean brands of butane carcinogenic is when they add "1,3 Butadiene" which is a human carcinogen and mutagenic, but this is not added to clean brands, only cheaper camping stove types butane fuels.
The fact is that making BHO correctly is actually cleaner then smoking buds, because you are not extracting the known carcinogens from the buds, just pure cannabinoids and terpenoids, with any fractional impurities (if any even exist) being so small that you need lab testing just to find them.
I will conceed that it can be very dangerous if you are not using common sense, but extracting BHO outside is totally safe, it evaporates very quickly and will not ignite without a source.
A little more info on Butane:
Inhalation:
At low concentrations n-butane is essentially non-toxic. At high concentrations, it can cause depression of the central nervous system (CNS) with symptoms such as headache, nausea, dizziness, drowsiness and confusion, based on animal and human information. It is expected to cause unconsciousness (narcosis) due to CNS depression at approximately 17000 ppm (1.7%).(24) (Note that n-butane is extremely flammable (lower explosive limit: 1.8-1.9%)). No symptoms except drowsiness were experienced by 3-6 volunteers during a 10-minute exposure to 10000 ppm (1%).(2)
Ingestion:
Ingestion is not an applicable route of exposure for gases.
Effects of Long-Term (Chronic) Exposure
n-Butane is not expected to cause health effects following long-term exposure.
Carcinogenicity:
No human or animal information for n-butane was located.
Some grades of n-butane may contain 1,3-butadiene, which is classified by the International Agency for Research on Cancer (IARC) as a human carcinogen (Group 1). If 1,3-butadiene is present in n-butane at a concentration of more than 0.1%, the mixture is considered carcinogenic. For more information, refer to the CHEMINFO review of 1,3-butadiene.
The International Agency for Research on Cancer (IARC) has not evaluated the carcinogenicity of this chemical.
The American Conference of Governmental Industrial Hygienists (ACGIH) has not assigned a carcinogenicity designation to this chemical.
The US National Toxicology Program (NTP) has not listed this chemical in its report on carcinogens.
Teratogenicity and Embryotoxicity:
n-Butane itself is not expected to cause developmental effects. There are two case reports of exposure to n-butane gas during pregnancy.(27,28) In both cases, severe oxygen deprivation occurred in the mothers who were unconscious when found. Both babies had brain damage due to oxygen deprivation, not to n-butane toxicity. No animal studies were located.
Reproductive Toxicity:
No human or animal information was located. n-Butane is not expected to cause reproductive effects.
Mutagenicity:
No human or animal information was located for n-butane. Negative results were obtained in short-term tests.
Some grades of n-butane may contain 1,3-butadiene, which is mutagenic. If 1,3-butadiene is present in n-butane at a concentration of more than 0.1%, the mixture is considered mutagenic. For more information, refer to the CHEMINFO review of 1,3-butadiene.
Toxicologically Synergistic Materials:
None known.
Potential for Accumulation:
Does not accumulate.
hxxp://www.intox.org/databank/documents/chemical/butane/cie69.htm
The fact is that making BHO correctly is actually cleaner then smoking buds, because you are not extracting the known carcinogens from the buds, just pure cannabinoids and terpenoids, with any fractional impurities (if any even exist) being so small that you need lab testing just to find them.
I will conceed that it can be very dangerous if you are not using common sense, but extracting BHO outside is totally safe, it evaporates very quickly and will not ignite without a source.
A little more info on Butane:
Inhalation:
At low concentrations n-butane is essentially non-toxic. At high concentrations, it can cause depression of the central nervous system (CNS) with symptoms such as headache, nausea, dizziness, drowsiness and confusion, based on animal and human information. It is expected to cause unconsciousness (narcosis) due to CNS depression at approximately 17000 ppm (1.7%).(24) (Note that n-butane is extremely flammable (lower explosive limit: 1.8-1.9%)). No symptoms except drowsiness were experienced by 3-6 volunteers during a 10-minute exposure to 10000 ppm (1%).(2)
Ingestion:
Ingestion is not an applicable route of exposure for gases.
Effects of Long-Term (Chronic) Exposure
n-Butane is not expected to cause health effects following long-term exposure.
Carcinogenicity:
No human or animal information for n-butane was located.
Some grades of n-butane may contain 1,3-butadiene, which is classified by the International Agency for Research on Cancer (IARC) as a human carcinogen (Group 1). If 1,3-butadiene is present in n-butane at a concentration of more than 0.1%, the mixture is considered carcinogenic. For more information, refer to the CHEMINFO review of 1,3-butadiene.
The International Agency for Research on Cancer (IARC) has not evaluated the carcinogenicity of this chemical.
The American Conference of Governmental Industrial Hygienists (ACGIH) has not assigned a carcinogenicity designation to this chemical.
The US National Toxicology Program (NTP) has not listed this chemical in its report on carcinogens.
Teratogenicity and Embryotoxicity:
n-Butane itself is not expected to cause developmental effects. There are two case reports of exposure to n-butane gas during pregnancy.(27,28) In both cases, severe oxygen deprivation occurred in the mothers who were unconscious when found. Both babies had brain damage due to oxygen deprivation, not to n-butane toxicity. No animal studies were located.
Reproductive Toxicity:
No human or animal information was located. n-Butane is not expected to cause reproductive effects.
Mutagenicity:
No human or animal information was located for n-butane. Negative results were obtained in short-term tests.
Some grades of n-butane may contain 1,3-butadiene, which is mutagenic. If 1,3-butadiene is present in n-butane at a concentration of more than 0.1%, the mixture is considered mutagenic. For more information, refer to the CHEMINFO review of 1,3-butadiene.
Toxicologically Synergistic Materials:
None known.
Potential for Accumulation:
Does not accumulate.
hxxp://www.intox.org/databank/documents/chemical/butane/cie69.htm