20 Litres PG
Monopropylene Glycol
Pharmaceutical Grade
99.8 % Purity
Chemical PropertiesMonopropylene
Glycol is an effective aircraft de-icer and car antifreeze
Monopropylene Glycol (or simply propylene glycol, HOCH2CHOHCH3) is a
colourless viscous alcohol with a particularly sweet taste. It’s highly
hygroscopic and soluble in many solvents, including water, chloroform
and acetone. Its structure contains an asymmetrical carbon, which means
two stereoisomers are possible. The standard commercial product is a
racemic mixture of both versions, but pure isomers can be obtained by
hydration of optically pure propylene oxide.
Production Monopropylene
glycol is synthesised industrially by hydration of propylene oxide
(CH3CHCH2O), in a non-catalytic reaction at 200 degree Celsius or
catalysed by ion exchange resin or sulphuric acid at a lower
temperature (150 degree Celsius). CH3CHCH2O + H2O → HOCH2CHOHCH3
Subsequently, a purification process by distillation under reduced
pressure is also required to remove propanediol, dipropylene glycol and
minute amounts of other polypropylene glycols, also produced during the
reaction. UsesThe vast
majority of monopropylene glycol manufactured is used in the production
of unsaturated polyester resins (which include recurring –COO groups
in the chain). This process involves a reaction between monopropylene
glycol (100 parts by weight) with maleic anhydride (72 parts by weight)
and isophthalic acid (54 parts by weight) to generate a co-polymer. It
is essential that the ratio 1.2:0.67:0.33 is maintained. These
components are mixed at 150 to 200 degree Celsius up to 16 hours, with
water continuously distilled from the reaction. These polymers can be
further used to produce thermoset plastics. Considered safe, this
compound is also used as a tobacco and food additive (E1520); as well
as in many personal hygiene and pharmaceutical products. In addition,
as it lowers the water’s freezing point, it’s an effective aircraft
de-icer and car antifreeze. In recent times the use of Glycol PG has seen a rise in the manufacture of eliquids in the vaping industry.
SafetyAs
mentioned previously, this compound has a low toxicity and high levels
are needed to be detrimental to health. In the body, monopropylene
glycol is simply converted mainly to pyruvic acid, which is a normal
metabolic component in various pathways to produce energy; but acetic
acid and lactic acid are also produced, as well as propionaldehyde. Of
these, only the latter may be potentially dangerous if present in large
quantities. As to achieve critical values, consumption would have to
be over a very short period of time, it is highly unlikely that this
threshold can be reached by consuming food with this additive. However,
despite rare, case of poisoning with monopropylene glycol can occur,
especially in children and pets, with accidental ingestion of
antifreeze. Up until recently, it was generally accepted that this
compound did not represent a risk following long-term exposure, but
concerns with regards to its safe use in paints have questioned its
original “Generally Recognised As Safe (GRAS)” classification.
Payment
Payment to be made using PayPal at the time of checkout, if you prefer to pay by credit or debit card over the phone then please get in touch using the phone number listed on the left of this listing.
Cash is also welcome if collecting in person.
Delivery
1 working day despatch with free 48 hour delivery service or you can upgrade your delivery to express 24 hour for only £6.00. Contact us to arrange.
Returns
Buyers can buy in confidence with our 14 day no-quibble returns policy.
Terms and Conditions
Refunds will only be made on returned items in unopened condition.
Returns postage will be the responsibility of the sender
Payment to be made using PayPal immediatly, or credit debit card over the phone.
Collections can be made from our warehouse at 140 Bridgeman Street, Walsall, WS2 9NW. Use ask seller question to arrange times.