Flying in the face of the often espoused proffered opinion that any residual butane in your concentrate is “poison”, the Food and Drug Administration has rated n-Butane, Isobutane, and n-Propane as Generally Recognized As Safe (GRAS).
https://www.gpo.gov/fdsys/pkg/CFR-2012-title21-vol3/pdf/CFR-2012-title21-vol3-sec184-1165.pdf
Food and Drug Administration, HHS § 184.1165 n-Butane and iso-butane.
(a) n-Butane and iso-butane (empirical formula C4H10, CAS Reg. Nos. 106– 97–8 and 75–28–5, respectively) are colorless, flammable gases at normal temperatures and pressures.
They are easily liquefied under pressure at room temperature and are stored and shipped in the liquid state. The butanes are obtained from natural gas by fractionation following absorption in oil, adsorption to surface-active agents, or refrigeration.*
(b) The ingredients must be of a purity suitable for their intended use.
(c) In accordance with §184.1(b)(1), these ingredients are used in food with no limitations other than current good manufacturing practice.
The affirmation of these ingredients as generally recognized as safe (GRAS) as direct human food ingredients is based upon the following current good manufacturing practice conditions of use:
(1) The ingredients are used as propellants, aerating agents, and gases as defined in § 170.3(o)(25) of this chapter.
(2) The ingredients are used in food at levels not to exceed current good manufacturing practice.
(d) Prior sanctions for these ingredients different from the uses established in this section do not exist or have been waived.
[48 FR 57270, Dec. 29, 1983, as amended at 73 FR 8607, Feb. 14, 2008; 76 FR 59249, Sept. 26, 2011]”
https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/cfrsearch.cfm?fr=184.1655
| TITLE 21–FOOD AND DRUGS |
| CHAPTER I–FOOD AND DRUG ADMINISTRATIONDEPARTMENT OF HEALTH AND HUMAN SERVICES |
| SUBCHAPTER B–FOOD FOR HUMAN CONSUMPTION (CONTINUED) |
PART 184 — DIRECT FOOD SUBSTANCES AFFIRMED AS GENERALLY RECOGNIZED AS SAFE
Subpart B–Listing of Specific Substances Affirmed as GRAS
| Sec. 184.1655 Propane. |
| (a) Propane (empirical formula C3H8, CAS Reg. No. 74-98-6) is also known as dimethylmethane or propyl hydrid. It is a colorless, odorless, flammable gas at normal temperatures and pressures. It is easily liquefied under pressure at room temperature and is stored and shipped in the liquid state. Propane is obtained from natural gas by fractionation following absorption in oil, adsorption to surface-active agents, or refrigeration.(b) The ingredient must be of a purity suitable for its intended use.(c) In accordance with 184.1(b)(1), the ingredient is used in food with no limitations other than current good manufacturing practice. The affirmation of this ingredient as generally recognized as safe (GRAS) as a direct human food ingredient is based upon the following current good manufacturing practice conditions of use:(1) The ingredient is used as a propellant, aerating agent, and gas as defined in 170.3(o)(25) of this chapter.(2) The ingredient is used in food at levels not to exceed current good manufacturing practice.(d) Prior sanctions for this ingredient different from the uses established in this section do not exist or have been waived.[48 FR 57271, Dec. 29, 1983, as amended at 73 FR 8608, Feb. 14, 2008] |