If wood is coated with sodium silicate solution the wood will no longer support combustion even after it dries. This procedure is satisfactory for any wood not rained on such as basement beams, attic beams, wall studs, or unpainted wooden walls (in warehouses for instance). With a protective coat it would probably be useful outside also. Not only is the material very inexpensive, but so is the labor. It can be sprayed on quickly with an ordinary garden insecticide sprayer, as well as all the usual tools for applying paint. It should also be practical to dip wood.
I can warmly recommend coating all undecorated wood in earthquake fault zones, especially buildings served by gas or near such buildings and in areas surrounded by dry brush
I suspect that by coating a wooden plywood fence it would make an inexpensive fire break in a forest as well. If the fence were placed in a swath of short grass and a wooden pipe sprinkler system installed, there should be few fires get past it. It is nutty to deliberately set fire to woodland to remove underbrush as is now often done. That brush should be used as a farm soil amendment or at the least, used to generate electricity. It could be harvested usually less expensively and more safely than coal. At the same time there would be less fire men and coal miner’s widows. Our forests are extremely valuable as a source of wood, for recreation, and to help cool the atmosphere. To cavalierly allow them to burn because we are too lazy or too stingy to protect them is idiotic.
I have used this procedure often and have never had any problem other than over spray staining some varnishes. I have even sprayed the diluted silicate into my eyes accidentally, with no obvious harm other than the sting one gets from soap in the eyes. I have not had full strength sodium silicate in my eyes, so use caution. Sodium silicate is caustic and will etch glass eventually, so it may be that you should not wear expensive prescription glasses when working with it. I suspect there would be no problem if it is wiped off in a reasonable time, but I have no experience. Sodium silicate is not toxic, although it is possible that breathing the spray could be conceivably harmful. For this reason, if it is sprayed, a garden manual sprayer is probably the best tool since the spray is coarse and works very well. An airless sprayer with a mask is the fastest way for large jobs. Thousands of square feet can be covered per day for sure with no danger of corrosion to the equipment.
The wood changes appearance to a gray mottled efflorescence when the silica precipitates out between the fibers and on the surface. Instead of being a tinderbox your structure will become petrified. It is extremely effective. A direct flame will char the wood but it will not support combustion.
Sodium silicate can be stored in almost any kind of container including steel, this last since silicate has rust inhibiting characteristics. Concentrated sodium silicate is said to corrode aluminum. It must be stored out of contact with air since carbon dioxide in air slowly converts it into a much less useful mixture of silica and sodium carbonate (sal soda). If the surface must be bright to reflect light or appearance counts, it is possible to white wash it with lime. I have only limited time experience with this last procedure. The coating lacks toughness of course. I have reason to believe that acrylic automobile enamel (actually a lacquer) is compatible with dry sodium silicate. This may prove to be a way to use this procedure outside and may work to maintain the wood color, but I have no experience with this last. Automobile enamel is very expensive. However diluting it with solvent could possibly make a less expensive primer coat out of it for less expensive latex paint. Be very careful with that enamel in closed spaces because I have good reason to believe the fumes can trigger an attack of gout. I have not tried acrylic concrete paint (also really a lacquer), but I suspect it would work. This combined technique may not be less expensive than fireproof paint, but it should be more resistant to ultraviolet and probably more fire proof. Acrylic latex paint is incompatible with fresh sodium silicate but aged surfaces may prove to be OK. Also it is possible that a wood stain might work also for appearance.
Tom Rawlings has reported to me that shellac coats silicate successfully. If so, it should make a good primer.
Not only are the pores of the wood blocked from feeding combustible gases to any flame to a considerable extent, but a ceramic foam builds up on the surface through release of the carbon dioxide from the resulting sodium carbonate that has formed. The latter tends to insulate the wood from the flame's heat. The net result is that the wood can not support combustion.
There is a fringe benefit to silicates. Such treatment probably makes the wood more resistant to termites. If termites are a problem, by mixing some borate (borax) with the silicates, it should make the wood even more resistant to termites (isoptera), and borate itself tends to make wood fireproof. Thus two goals would be reached with a single application of nonpoisonous material. If you come across any ingenious techniques for adapting sodium silicate to fire proofing or painting it, please let me know. You can easily see how well it works by coating some scrap lumber, letting it dry, and hitting it with a propane torch.
Another good way of fire proofing wood is to glue aluminum foil to it with solvated, fibrated asphalt. This prevents the wood from burning when assailed by a flame for a long, long time. Aluminum foil is fragile so it is advantageous to protect it with mobile home roof acrylic if it is walked on.
It is a procedure which is especially useful on a wooden roof because it has the additional attributes of:
1. The roof is water and rot proofed. The water proofing can not be depended on so any joints in the plywood must be sealed well.
2. The asphalt is protected from ultraviolet degradation and so has an indefinite life.
3. The materials are very inexpensive, and so usually is the labor fairly so.
It is possible that combining the above two procedures would be especially advantageous. I have never tested this combined procedure so if you try it, do it on a small test scale first. One respondent has reported that sodium silicate is a good adhesive for aluminum. It does seem plausible that sodium silicate would bond to aluminum since aluminum has a thin coat of aluminum oxide on the surface. It does not look to me as if there should be any problems, though. If it had been in place at Chenobryl, that disaster probably would never have happened. Keep in mind, though, while aluminum is an excellent reflector of light, it is not very good at reflecting infrared radiation and it will not do so inside a wall. Also it will not transmit water vapor so will not breath.
Another fire proofing procedure works well on asphalt shingle roofs. This involves coating the roof with about one eighth inch of Portland cement made up with butadiene-styrene latex formulated for this purpose. Such a coating is much more resilient than Portland cement, almost as resilient as box wood. It is very adherent to many surfaces. One of its chief advantages, however, is that it dry cures. Unfortunately it is no longer available in retail quantities because of Dow Chemical Company's fear of product liability and is only available to approved bridge contractors, from whom you can sometimes get it. Acrylic latex additive would probably work also and may be less damaged by ultraviolet. It is available as the Probond and Bonsal trade names.
Such a coating is quite fire resistant. It is comparable to the aluminum foil mentioned above. It can be brushed on very easily. It is slightly soluble in water, however, like all Portland cement. Therefore an eighth of an inch will erode off in 7 or 8 years in a climate like the northeast USA. For this reason it is desirable to paint it with an acrylic latex paint or a concrete paint made mold resistant with a poison, which should be capable of inhibiting algae also. An additional advantage of this step is that it enables any color. This procedure changes the texture of the shingles. Some may prefer the original texture. It could probably be reestablished with the correct knife and/or trowel while uncured, although this would be labor intensive. However there is no substitute for a fire resistant roof, especially in a dry forest.
An additional advantage of this procedure is that the shingles are protected from ultra violet degradation. I do not know if this keeps the shingles intact indefinitely, but I suspect so. It is a good way to salvage a roof which is starting to deteriorate. Replacing a roof every 10 or 20 years can be noticeably expensive.
Fire insurance was a good invention as a financial safety net. However, there is no really good substitute for not having the fire in the first place. Money can be the least of what can be lost. If you are sitting out in an icy gutter holding some money, it can be a big help, but it is no substitute for emotional peace of mind, priceless heir looms and antiques, disruption in one's life, laboriously gathered photos, data and papers, or most important of all, family members.
You may see an article describing treatment of wood with various silicon compounds here.
These sources are old and some may be obsolete now.
Post Apple Scientific provides. sodium silicate in 500 milliliter, one gallon, 5 gallon, and 55 gallon containers, from 8893 Gulf Road, North East, PA , USA, 16428. Phone 1-814-434-8801.
Sodium silicate may be
obtained in one and 5
gallon containers from:
http://chemistrystore.com/sodium_silicate.htm
Sodium silicate is available in 5 gallon cans from; Industrial Chemical and Scientific Co., 11722 Charles St., Houston TX 77041, phone = 715 455 8776 or 800 332 4047.
Ashland Distributors in 55 gallon fiber drums , for about $350 phone 800 522 1409.
Ruger Chemical Co. http://www.rugerchemical.com as 20 liters for $43 (but $150 minimum), phone 973 926 0331.
PQ Chemical Co., (available also as a soluble powder as well as a solution) http://www.pqcorp.com/productlines/SilicapowdersHome.asp?US_ID= Be sure to acquire the easiest to dissolve powder if you go this way.
Dooner and Smith in NJ, USA, sells 5 gallons, but only over the counter.
Thomas Register lists some manufacturers who may possibly furnish dealers or sell retail as follows:
Chemical Services, West Chester PA.
North Metal & Chemical 888 372 6177
Occidental Chemical Corp. Dallas, TX.
C.E.D. Process Industries 330 666 2400.
GFS Chemicals, Inc (high purity) 800 394 5501.
Captree Group, Inc (laboratory supplies) 631 841 0200.
Alfa Chemical Corp, Kings point NY.
Mil-Spec Industries Corp., Roslyn Hieghts, NY
Searching on the internet may possibly be assisted by the following synonyms; water glass; soluble glass; silicate of soda; sodium orthosilicate; silicic acid sodium salt; sodium silicate glass, Na4O4Si.
There is said to be a very fire resistant coating, although expensive, with which I have no personal experience. and borates also fire and termite proof wood.
You may see innovative ways to repair tennis courts and macadam parking lots at this site.
In an unrelated health field see a series of articles on potassium in foods especially as it relates to arthritis, high blood pressure, and heart disease . It is the most comprehensive presentation of potassium nutrition and physiology in the world, a way to Cure tooth abscess using anacardic acids in raw cashew nuts , and the use of foods containing copper to prevent hemorrhoids, aneurysms, slipped discs, anemia, and emphysema. If you know someone who has diabetes, point them to this site, A procedure using iodide for curing fluoride poisoning may be seen in this article.
There is a free browser called Firefox, which is said to be less susceptible to viruses or crashes, has many interesting features, imports information from Iexplore while leaving Iexplore intact. You can also install their emailer. A feature that lists all the URLs on a viewed site can be useful when working on your own site.
Updated October 2008