Preparing A Non-Toxic Water-Repellent Preservative
- Procedure code:
- Developed For Hspg (Nps - Sero)
- Wood and Plastics
- Preservative Treatment
- Last Modified:
- This procedure includes guidance on preparing a water-repellent preservative that is relatively environmentally friendly. ; It is derived from a formula provided by the United States Department of Agriculture Forest Products Laboratory.
- United States Department of Agriculture Forest Products Laboratory
NOTE: ; Chemical products are sometimes sold under a common name. ; This usually means that the substance is not as pure as the same chemical sold under its chemical name. ; The grade of purity of common name substances, however, is usually adequate ; ; for stain removal work, and these products should be purchased when available, as they tend to be less expensive. ; Common names are indicated below by an asterisk (*).
- Mineral spirits: ;
NOTE: ; MINERAL SPIRITS SHALL BE CLEAN AND COLORLESS SO THAT IT WILL NOT ADVERSELY AFFECT THE TEXTURE OR DURABILITY OF THE STAIN.
- A petroleum distillate that is used especially as a paint or varnish thinner.
- Other chemical or common names include Benzine* (not Benzene); Naphtha*; Petroleum spirits*; Solvent naphtha*.
- Potential Hazards: ; TOXIC AND FLAMMABLE.
- Safety Precautions:
- AVOID REPEATED OR PROLONGED SKIN CONTACT.
- ALWAYS wear rubber gloves when handling miner al spirits.
- If any chemical is splashed onto the skin, wash immediately with soap and water.
- Available from construction specialties distributor, hardware store, paint store, or printer's supply distributor.
- Pure steam distilled turpentine is the legacy product that would have historically been used for a preservative mixture of this type, and it may be directly substituted for mineral spirits. ; The primary difference between the two is that mineral spirits is a petroleum product with a low cost, and turpentine is a wood product with a higher cost.
- Paraffin wax
- Boiled linseed oil: ;
- Boiled linseed oil shall be used rather than raw linseed oil as raw linseed oil does not dry and will leave a sticky residue that is difficult to maintain with paint. ;
- The linseed oil shall be fresh and directly from a sealed container so that there will be no unintended impacts to the texture or durability of the paint coating applied to it.
- Clean, clear water
- Double boiler (this is a device normally utilized for heating food or doing canning, using ; an external vessel (pot) filled with water, and an internal vessel suspended in the water (another pot) that is filled with the product to be warmed. ; This insures that the product to be warmed cannot burn or attain a spot-temperature higher than the boiling point of water.)
- Stiff bristle brush
3.01 ERECTION, INSTALLATION, APPLICATION
NOTE: ; THIS WILL MAKE 5 GALLONS OF SOLUTION.
- Melt (1 lb.) paraffin in double boiler being careful not to get it too hot as it can ignite. ; Temperature should range between 80 and 100 degrees F.
- Allow to cool to about 70 degrees F before adding the preservative mixture.
CAUTION: ; FUMES ARE HIGHLY TOXIC; WEAR PROTECTIVE CLOTHING INCLUDING GOGGLES; WORK OUTSIDE; USE AN ORGANIC VAPOR RESPIRATOR.
- Add (3 gallons) boiled linseed oil and (1 gallon) mineral spirits.
- Apply the mixture at 70 degrees F to 80 degrees F. ; Below 40 degrees F the paraffin is not sufficiently liquid and the material cannot penetrate. ; Above 80 degrees F the mixture dries too fast and will not achieve sufficient penetration.
END OF SECTION