There can be many problems attached to oak staining especially with green oak. Unstightly stains and marks can spoil good looking beams or floors. Dark Spots and discoloration of the wood can be removed with Oxalic Acid. Oxalic Acid can also be used to freshen wood colour if it has become grayed due to external exposure.
In the refinishing of wood furniture, oxalic acid can be used after stripping to lighten and soft darker stained areas before refinishing. It can also be used as a rust remover and a stain remover in many other applications. In removing iron stains users can scrub the stained area with a solution of oxalic acid in water.
Oxalic Acid is used
– by those working with wood, timber & wooden beams
– in removing tannin stains
– in removing rust in automotive shops and in restoring antiques
– in rust stain removal
– Those pre-treating stainless steel
– in preparing & polishing stones & marble
– in restoring furniture as Oxalic Acid bleach
– by Fishermen lin maintaining wood on boats & quays
– by Beekeepers – a 6% solution of oxalic acid in sugar can protect against the parasitic Varroa mite
– as a purifying intermediate in pharmacy
– as a precipitator in rare earths processing
– Concentrate crystals removes tannins and water stains from timber
– Ideal for oak frames and beams
– Can be put to many uses due to the flexibility of using crystals
IF SWALLOWED %u2013 Give 1 or 2 glasses of water and call for medical assistance immediately.
EYE CONTACT – Wash with plenty of water for at least 15 minutes; Get medical attention promptly.
|Solubility in water||:||APPRECIABLE|
|Density||:||1.901 at 25 oC|
|Melting point||:||102 oC|
|TLV Country NL Year 1995||:||ppm 1mg/m3|
|Pollution category 1994||:||–|
Using Application :
Oxalic Acid is used extensively for boat cleaning, it can be used on timber, GRP and steel craft for the removal of rust and waterline stains and also to clean timber decks. For vertical applications oxalic can be mixed with wallpaper paste to make a thick solution, this mix will cling to any vertical surface and can be washed off with water.
REMOVAL OF IRON STAINS
Iron stains can be removed by scrubbing the stained area with an aqueous solution of oxalic acid in water. Dissolve 1kg oxalic acid to 6Lt of warm water. Scrub stained area using a stiff-bristle brush. Thoroughly rinse with water after treatment. When completely dry, lightly sand the surface. Surface must be clean and
completely dry (not just surface dry) before refinishing. Incomplete drying and retained subsurface moisture can cause finish adhesion failure.
Many of Construction Chemicals customers are involved with building renovation and in particular Oak frames, oak windows and beams as well as flooring. Our product range ensures that whenever timber is being used we have the products to bond, fill, preserve, sand, stain and paint. Our Customers will be aware of the problems of oak stains especially with green oak. This can look unsightly and spoil good looking beams or floors. OXALIC ACID CLEANS MOST STAINS FROM TIMBER.
REMOVAL OF BLACK WATER AND TANNIN STAIN
A common form of staining on wood surfaces results from contamination with iron. A portion of the extractives in wood includes a group of chemicals collectively called tannins. The amount of tannins depends on species; oak, redwood, and cedar are rich in tannins. Tannins react with iron to form a blue-black stain on wood. Common causes of iron stain include use of un-galvanized or poorly galvanized fasteners; OXALIC ACID brushed into the stains makes removal easy. Finishing wood with a WATER REPELLANT WITHA PRESERVATIVE AND/OR WOOD POLISH OR OIL greatly minimizes further iron stain and enhances the finish of the wood.. Wood must be clean; free of paint, waxes, oils and dirt. Use wood cleaners to remove any grease oils or grime. Use paint strippers to remove any finish, paint or coating.
Note: This article uses material from the http://rxmarine.com/