Frequently asked questions
Here you will find some common questions and the appropriate explanations about our product range. If you have any further questions, please do not hesitate to contact us.
General information
At Briefkasten Manufaktur, only high-quality materials are selected and processed, which guarantee durability and timeless elegance. Please bear in mind, however, that noble materials in particular need to be cared for. Even normal environmental influences can cause soiling and even surface changes. Particularly in industrial conurbations or at sea, deposits in the form of flash rust can occur and the material can be attacked. Here, systems should be cleaned and maintained more frequently.
Stainless steel
One of the materials we use for our products is stainless steel. This steel is characterised by its resistance to water, water vapour, humidity, food acids and weak organic and inorganic acids when used and maintained as intended. After the letterbox has been installed, it should be cleaned for the first time to remove any dirt caused by storage, transport or construction or installation work. Protective layers of paper, foil or adhesive residues must be completely removed after assembly, as they can lead to corrosion. The letterbox should then be maintained approx. every 3 - 4 weeks. We recommend our stainless steel maintenance spray. Please note: The cleaners must not contain any hydrochloric acid, chlorides or hydrocarbons. Under no circumstances should steel wool, steel brushes or similar be used for cleaning stainless steel, as such aids damage the protective surface and enable the formation of extraneous rust through abrasion. Corrosion caused by flash rust is excluded from the warranty. Stainless steel surfaces must always be cleaned in the direction of the rust.
Aluminium
Oxydising or mechanically acting cleaning agents must not be used as they attack the anodised layer. Caution! Protect aluminium parts from cement, lime, plaster, etc.
Glass/Plexiglass
Acrylic glass (Plexiglas) must not come into contact with organic solvents such as thinners, alcohols, fuels, etc. Glass cleaners also usually contain alcohols. Glass cleaners also usually contain alcohols. For cleaning, use only clear water with a few drops of washing-up liquid and a soft sponge. Dust must never be wiped away dry.
Powder coatings
Water and small amounts of a mild cleaner can be used to clean the surface of the powder coating. If absolutely necessary, a small amount of turpentine substitute can also be used. Then rinse with water and a mild cleaner!
Painted surfaces
We recommend weekly cleaning and sealing with car wax at least four times a year for painted surfaces! For cleaning, use only clear water with a few drops of washing-up liquid and a soft sponge. Painted surfaces must also be dried and sealed with car polish. Caution: Do not use cleaning agents containing vinegar.
Lock and hinges
Please only maintain the cylinder lock with a special lock care spray. This way you can enjoy a functioning letterbox lock for a long time. It is best to clean and maintain letterbox hinges twice a year
You can find care and cleaning products in our care guide.
Please note: The cleaners must not contain salts, chlorides or hydrocarbons. Under no circumstances should steel wool, steel brushes or similar be used for cleaning stainless steel, as such aids damage the protective surface and enable the formation of extraneous rust through abrasion. Corrosion caused by rust film is excluded from the warranty.
Templates for our name badges in PDF format. You can label them digitally, print them out yourself and use them directly. We recommend printing on thicker paper or transparent film.
Spare parts for each product can be found directly on the product pages below the product description.
In the spare parts shop for Briefkasten Manufaktur Lippe letterbox systems and letterboxes you will find important spare parts from nameplates to letterbox locks.