What is Propylene Glycol?

What exactly is the 'special solution' I'm supposed to put in my humidor, and how often should I put it in?

Submitted via CigarAficionado.com

It's a solution of 50 percent water, 50 percent propylene glycol. You should recharge your humidification device with it every three to six months.

Propylene glycol (PG) is hygroscopic to 70 percent relative humidity, meaning its presence will keep water from evaporating beyond 70 percent. You definitely don't need to use the solution every time you fill your humidification device, but you shouldn't wait longer than six months before adding it.

Several companies sell the distilled water/PG solution pre-mixed. Another option is to buy PG at a pharmacy for about $7 a quart, then mix it yourself.

(Note: While special solution can be used in most devices, some humidifiers, such as those by Diamond Crown, use only distilled water. Refer to the manufacturer's instructions on whether it should be added or not.)

Have a question for the Cigar Aficionado editors? Submit it here

George Ayala Fort Worth, TX Texas, US , February 13, 2012 1:20pm ET
I've used this stuff before and I noticed a chemical taste from the cigars. I then took the gel out and let the cigars sit for a few month and went back to distilled water and I noticed that the cigars no longer had that weird taste. Just wondering if anyone has had that same issue?
marrese1@hotmail.com February 13, 2012 8:17pm ET
I always use Xikar PG with all Xikar crystals (2oz. jar and 3 bars) and my cigars stay perfect.
T M Bellevue, WA, USA, February 13, 2012 8:19pm ET
I use Xikar PG with all Xikar crystals (2 oz. jar and 3 cigar bars) my cigars always stay perfect.
Tom Rabel Albuquerque, NM, USA, February 14, 2012 7:05pm ET
Do you have to dilute PG in water every time? What about in crystals? I was told you were only to use pure PG with them.
Tom Rabel Albuquerque, NM, USA, February 14, 2012 7:06pm ET
Do you have to dilute PG in water every time? What about in crystals? I was told you were only to use pure PG with them.
Daniel McCreary belen, new mexico, USA, February 15, 2012 7:43pm ET
Some PG you will have to dilute, however the Xicar PG solution comes pre-mixed and yes you should only use PG solution(mixed 50/50 works) with the crystals.
Paul Bell February 16, 2012 12:59am ET
Anyone use those Boveda Packs? I'm thinking of trying those. Supposedly the Arturo Fuente company endorses them.
Alan Garcia Dover, DE, USA, February 16, 2012 10:57am ET
I currenly use Boveda pack beads. Althugh they do not last forever, I don't have to recharge them as often. In cases in which I do not open the Humidor for an extended period of time (30 days or more), the humidity remains constant at 68-70%. Changes in temperature will cause the humidity to vary, so I check it every once in a while. Point is, they work well.
Earle Kuhn Glen Ellyn, IL, United States, February 17, 2012 8:50pm ET
I tried the Boveda packs. I measured my humidor and per their website I put in two packs. The humidity was to low. Just added a third pack and I am hoping that will help. Anyone else have this problem?
Gilles Petel Montréal, Québec, Canada, February 19, 2012 2:53pm ET
Je n'utilise que de l'eau distillée et mes cigares (partagas, hoyo dey monterry, roméo et juliette, montecristo) sont dans mon humidir depuis plus de 6 mois (achetés à Genève) sont en excellentes conditions et leur goût n'est jamais altéré. Mon humidor est un Colibri qui peut contenir une dinaine de cigares, dépendamment du module
Gilles Petel Montréal, Québec, Canada, February 19, 2012 2:54pm ET
Je n'utilise que de l'eau distillée et mes cigares (partagas, hoyo dey monterry, roméo et juliette, montecristo) sont dans mon humidir depuis plus de 6 mois (achetés à Genève) sont en excellentes conditions et leur goût n'est jamais altéré. Mon humidor est un Colibri qui peut contenir une dinaine de cigares, dépendamment du module
derek hodges Sebring, FL, 33875, February 21, 2012 9:33pm ET
Propylene Glycol USP Food Garde is available at:

http://www.essentialdepot.com/servlet/the-Propylene-Glycol/Categories

Etela Neumann Vancouver, BC, Canada, March 23, 2012 12:22am ET
I have a humidor the size of a china cabinet, which doors and windows are perfectly sealed, so that the glass shelves do not hava a speck of dust on them for months. I use only plain water in a couple of small dishes, which I refill once in two months. The humidity is maintained at 65-70%. All of my Cuban collectible cigars are in perfect condition. How long can one keep collectible cigars?
Frank Giampa London, Ontario, Canada, April 21, 2012 7:14pm ET
Etela Neuman, what make is your humidor? I am looking to purchase a larger humidor to accommodate my collection. As I travel too Cuba often, I am always adding.
Thank-you.

Log in if you're already registered.

Or register for Cigar Aficionado today—it's free.


Registration allows you to:
  • Keep track of your favorite cigars in your personal humidor.
  • Comment on all our stories.

Forgot your password?



Ratings & Reviews

Search our database of more than 17,000 cigar tasting notes by score, brand, country, size, price range, year, wrapper and more, plus add your favorites to your Personal Humidor.