There are quite a few misunderstood concepts about oxygen absorbers and Mylar bags because they were intended to be used commercially for product packaging under the guidance of a food technologist. Nowadays, directions for home use have mostly consisted of internet posts from those who have used them. For the most part the information on the internet is correct, but some incorrect things have been spread around the internet too.
True or False
Your Mylar bag will look vacuum-packed when the oxygen has been removed.
False. It
is a very common misconception that the “vacuum-packed look” is a
confirmation that the oxygen has been removed. This myth is probably why
people seem to think some oxygen absorbers do not work.
True,
you often WILL see this effect, but if you don't that does not mean the
oxygen removal process didn't work. Oxygen absorbers do not absorb air;
they absorb oxygen, which is 21% of air. That means roughly 1/5 of the
air volume will be gone but 4/5 of the air remains no matter how many
oxygen absorbers are used.
True or False?
Thicker Mylar bags work best.
False. Thickness
can relate to the physical strength of the bag, but our Mylar bags will
hold weight of 2 cinder blocks over EACH square inch because it is
“Biaxially Oriented” which makes a grid-like structure for remarkable
strength that protects far better than other thicker bags.
True, 7 mil Mylar and other “extreme” thick Mylar bags
relatively provide no more oxygen protection than 2 mil Mylar because it
is only the aluminum on the surface that keeps the oxygen out. Also
keep in mind that you will need a 600 watt sealer to seal Mylar properly
that is 7 mil thick.
True or False?
You should check your new Mylar bags for leaks. Some may have small holes at a folded crease.
False. Mylar
is one of the toughest flexible materials ever created but it is not
metal. People are more familiar with a lower quality replica of Mylar
that looks metallic because a separate layer of aluminum has been added.
True, Mylar is transparent. Normal use such as filling
it or moving it will cause tiny breaks in the foil layer that you may
sometimes see if you hold it to the light - but don't worry, they are
not holes. This happens with all Mylar foil films and their barrier
properties are not significantly affected.
True or False?
If Mylar bags fail the “flashlight” test than they are no good.
False. Mylar is
transparent and metal has been added to the Mylar to increase its
barrier properties. People in the past have wondered if light is going
to damage their food and it is true that all forms of energy have some
potential to effect matter.
True, direct sunlight can
have a noticeable effect, but inside a metalized bag in a cool, dark
storage place, there is virtually no effect from light. Our gallon and
quart Mylar bags are metalized through a process called vapor deposition
whereby aluminum is sprayed onto the Mylar surface to make it a better
oxygen barrier.When you hold them to the light, you can see through
them. They still provide an excellent barrier and will keep food
preserved for well over 25 years.
For more information pre roll mylar bags, please get in touch with us!