MATERIAL / STAINLESS STEEL USED
The Letterbox Shop only uses Marine Grade 316 STAINLESS STEEL with an N4 (brushed) finish for all its letterbox face panels and plaques apart from the CORTEN range
Housing boxes will be manufactured with either Marine Grade 316 Stainless Steel or Marine grade 445m2 stainless steel.
316 STAINLESS STEEL BASIC PROPERTIES
Stainless steel is a generic term for a family of corrosion resistant alloy steels containing more than 10.5% chromium. It has excellent weldabilty, formability, fabricability, ductility, cleanability and hygiene characteristics. Good high and excellent low temperature properties. When nickel is added in sufficient amounts the crystalline structure changes to "austenite". Series 300 stainless steels (including G316 and G304) are austenitic and are the most common stainless steels in use in the world today. G316 (also known as UNS S31600, A4 or"316 marine grade" stainless) has molybdenum added for higher corrosion resistance and is recommended for aggressive environments.
For more information on 316 Stainless steel please go to; Australian Stainless Steel Development Corporation (ASSDA)
http://www.assda.asn.au/technical-info/grade-selection/316:-the-first-step-up
COMMON QUESTIONS / ISSUES WITH STAINLESS STEEL
What is "TEA STAINING"
A brown discolouration commonly known as "tea staining" may also occur, especially in coastal regions. There is no known cause for this and it can occur quite rapidly. It can be controlled by regular maintenance and while it does not cause structural damage it is cosmetically unpleasant. For best cleaning results please use the Stainless steel cleaner and preserver available from The Letter Box Shop or alternate Lanolin based corrosion inhibitors.
Tea Staining can occur with any stainless steel product, which is NOT classed as a defect.
For more information on Tea Staining please go to; http://www.assda.asn.au/index.php?option=com_content&task=view&id=85&Itemid=111
Will the stainless “CORRODE”
The chromium in stainless steel causes a thin film to form on the surface giving stainless its corrosion resistance. When this film is damaged by scratching or surface contamination by foreign materials such as salt, pollution, metal filings etc. corrosion can occur. After removal of rust marks the film self heals after a short period of time.
CORTEN MATERIAL
Weathering steel, best-known under the trademark COR-TEN steel and sometimes written without the hyphen as "Corten steel", is a group of steel alloys which were developed to obviate the need for painting, and form a stable rust-like appearance if exposed to the weather for several years. As you will be able to see from our website, Corten has a rusty finish. Corten is a structural material that was originally designed to be used in shipping containers. The rust creates a protective barrier so the material underneath will not deteriorate over time. There is a big difference between mild steel and Corten. The natural rusted finish on Corten is REAL rust and will leach a stain if exposed to the elements. Please consider this especially if you had planned on having a Lump piece on or near pale coloured walls or tiles.
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Aluminium Letterboxes
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Indian Letterboxes
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Atlantic Range
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Tasman Range
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Corten Steel Letterbox
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Front Opening
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Stainless Steel Letterbox
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Letterbox Numbers
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Integrated Intercom
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Plaques and Signs
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Replacement Keys & Cleaning Products
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Custom Letterbox
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Letterboxes to suit 230mm Brickwork
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Letterboxes to suit 350mm brickwork
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Letterboxes to suit 400mm brickwork
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Letterboxes to suit 470mm brickwork
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Letterboxes to suit 600mm brickwork
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Deals
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Trends
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Sale
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Fonts
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Deep Housing Box
***These hours are a guide and it is recommended you ring and make an appointment as we do pop in and out.
- Monday9am - 4pm
- Tuesday9am - 4pm
- Wednesday9am - 4pm
- Thursday9am - 4pm
- FridayClosed