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PENETRATING - SEALING EPOXY
Solvents used in Penetrating Epoxy
Solvents used in popular penetrating epoxy systems
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Paul Oman, MS, MBA - Progressive Epoxy Polymers, Inc. (floor epoxies, marine epoxies, underwater epoxies, repair epoxies)
Member: NACE (National Assoc. of Corrosion Engineers), SSPC (Soc. of Protective Coatings)
"Professionals helping Professionals since 1994"
PROGRESSIVE EPOXY POLYMERS, INC.
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We've been selling epoxy - marine epoxy (boat building - wood / fiberglass repair) industrial coatings - garage paint - underwater epoxies - thick putties - tabletop resins and supplies since the early 1990's |
Let's call this leading product Product X. Solvents in this popular product - as listed in their MSDS dated 4/15/95
for quote "either Part A or Part B" (this means these chemicals are in both parts of the epoxy). Percentages
of each are vague on most MSDS sheets. All the MSDS states is "weight % < 50% for all of the listed compounds.
Generally the compounds listed on MSDS sheets are in listed in decreasing amounts.
Unlike most epoxy data sheets, the vendor's MSDS does not list the standard epoxy components (like the epoxy polyamines,
nonyl phenol, etc.), only the required hazardous compounds.
aromatic hydrocarbon CAS # 64742-95-6 * (very common - similar to
gasoline or kerosene - see comment below)
xylene (common paint store solvent)
toluene (common paint store solvent)
isopropyl alcohol (2-propanol) (common, cheap rubbing alcohol)
2-butanone
4-methyl 2-pentanone
2-heptanone
4-methyl 2-hexanone
2-pentanone
dipropylene glycol monomethylether
diisobutyl ketone
ethyl acetate
isobutyl acetate
ethyl 3-ethoxy propionate
propylene glycol monomethylether acetate
hexyl acetate
isobutyl isobutyrate
diacetone alcohol
cyclohexanone
Volatile organic content (VOC) 675 grams / liter - These exceeds the legal VOC limits anywhere in the USA. This product can be
sold only because of the use of 'exempt' solvents like naphtha (aromatic hydrocarbon 64742-95-6). This product
is not based upon science and solvents but rather cheap chemicals that can be legally sold in the USA.
Note: There are 1000 grams in 1 liter of water. Epoxy is heaver than water, solvents are lighter.
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AROMATIC HYDROCARBON. I tracked down this unidentified hydrocarbon by its listed CAS number. This compound is Type 1 Naphtha (Naphtha). Technically gasoline and kerosene are considered naphtha's too (according to www.encyclopedia.com/htm/n1/naphtha.asp). However, aromatic naphtha is generally obtained from the distillation of coal tar rather than petroleum. Naphtha is also called 'white gas' and also known as Coleman Fuel (for Coleman lanterns and stoves).
Like other solvents such as xylene, naphtha does a good job of soaking into dry wood. Unfortunately, pure naphtha separates out from the epoxy. To fix this you add other more traditional solvents (MEK, acetone, etc.) along with the naphtha. Note that naphtha can be generated from (I believe) coal - which is formed from wood, so one of our competitor's ‘crazy' claims about a special wood based product is perhaps not so crazy after all. Also their use of Isopropyl Alcohol (rubbing alcohol) can also be 'wood based.' We always just assumed they were talking about the epoxy part of the product, but if they were really talking about their primary ingredient, the naphtha, it begins to make more sense.
Our Competitors are not happy with us and their lawyers respond!
Learn more Click Here.
FEEDBACK FROM READERS SINCE THE POSTING OF THIS ARTICLE
Email I received
Hello Paul (pauloman555@yahoo.com):
I'm replacing half of the wood inside the transom, part of a stringer,
both motor mounts and the floor in a 21' day cruiser with a 260 HP MerCruiser
engine and stern drive . One of the other Epoxy distributors (that you
compare) says that their epoxy is a virgin wood derived resin. What does
this mean and how does that compare to your resin? By the way I appreciate
your articles on resin, it has taught me to ask more questions.
thanks, Kim
IN RESPONSE I SENT HER THE FOLLOW POST I FOUND ON WOODENBOAT
MAGAZINE'S ONLINE BOAT BUILDING FORUM
Post by Dave Carnell on the WoodenBoat Forum
Topic "Chemicals from Wood"
Wood Chemicals
The most offensive promotion of **** and related products is the claim that because they are derived from wood
they retain the properties of wood. This is 100% charlatanic hokum. *** ****** uses it much more than *****.
1. Their epoxy resins are not derived from wood. They are the same petrochemical products everyone uses, made by
companies such as Dow and Shell.
2. Some of their solvents could be made from wood, but it is extremely unlikely that they are today. In any event,
chemical molecules have no DNA or heredity that ties them to their originating raw material and its properties.
When I was a kid you bought "wood alcohol" at the hardware store. It was methanol made by destructive
distillation of wood.
Ford operated a large continuous wood distillation plant at Iron Mountain, MI, where they made much of the solvents
needed for their finishes from scraps of the maple, birch, etc. used to make their car bodies. Ford dealerships
around the country sold Ford charcoal from the plant for picnic fires. During our investigation of alternatives
to petrochemical feedstocks in the 70s we discovered why that plant could run for weeks without external heat.
Differential thermal analysis of wood decomposition showed that there was an exothermic reaction involved that
made it self-sustaining. The first synthetic methanol was made in 1925 by DuPont's synthetic ammonia plant at Belle,
WV, as a by-product of the gas purification system of the ammonia plant. It soon became the major source of methanol.
The synthetic methanol molecules are identical to those derived from wood, as are the molecules of any other solvent
regardless of the raw material source.
Anyone who claims chemicals derived from wood have any properties related to wood is indulging in worse hokum than
P. T. Barnum ever thought of.
Authors note: I suspect the mention of the 'wood link' might
be based upon not the epoxy but the 4th solvent listed in the MSDS sheet - Isopropyl Alcohol (rubbing alcohol,
which can be made from wood).
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"Penetrating/priming" Products offered by Progressive Epoxy Polymers, Inc.
LOW V™ (thin, solvent free
epoxy - add solvent to this to make a penetrating or priming epoxy) - Click Here
ESP 155™ (our own clear primer epoxy with approx. 25% solvent - add more solvent for an easy penetrating epoxy) - Click Here
Other Links:
Penetrating epoxies - www.epoxyproducts.com/penetrating4u.html
Treating rot - www.epoxyproducts.com/rot.html
Competitor's penetrating epoxy solvent list - www.epoxyproducts.com/solvents.html (this page)
More on primers - www.epoxyproducts.com/primer.html
Sealing wood (tests) - www.epoxyproducts.com/woodseal.html
Using copper powder in epoxies - www.epoxyproducts.com/copper4u.html
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Solvents used in Penetrating Epoxy
Solvents used in popular penetrating epoxy systems