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  1 - What do I use silicone for?  
  2 - Do I have to do anything to the surface matrial before I apply a silicone sealant?
  3 - What is adhesion characteristics for different surfaces?
  4 - Why wood the silicone that I apply not hardens?
  5 - Should silicone turn yellow after they are applied?
  6 - The flexibility and shore hardness of some silicone sealants in the market are too soft or very hard and variable flexibility, Why?
  7 - Can I use silicone sealants under water?
  8 - Can Iuse silicone selants in food industry?
  9 - What is Anaerobic?

  1 - What do I use silicone for?
        Silicone is a excellent material to use for sealing any gaps or adhering surfaces together. *Silicone is a very flexible material that can withstand significant joint movement without cracking or pulling away.*Alda Silicone products, when used properly, will not yellow, shrink or crack like many latex products.

  2 - Do I have to do anything to the surface matrial before I apply a silicone sealant?
        Some materials, such as concrete, soft woods, stone, specially treated metals, plastics, other man -made materials with variable formulation may have unpredictable surface characteristics. Therefore Alda recommends that you test for adhesion by applying Alda sealants to a small area before proceeding with an entire job. It is also very important to prepare surfaces properly. This should be done on the same day you apply the product.
The following are guidelines for preparing various materials:
Concrete, Masonary & stone
Use a wire brush to remove all old sealants and dirt, dost and loose particals. All contaminants and impurities must be cleaned off, such as concrete from release agents, water repellents and other surfaces treatments and protective coatings.
Porous surfaces
Use sand paper or wire brush where necessary to provide a sound, clean surface.
Metal, Glassm and Plastics
These surfaces should be cleaned with a solvent such as mineral spirits or lacquer thinner.
General
*Do not use silicone sealant products on any galvanized surface.
*Cleaning with detergent or soap and water is NOT recommended.
*when using solvents, always wipe the surface dry with a clean cloth or lindless paper towels. Never allow solvents to air dry or evaporate without wiping.

  3 - What is adhesion characteristics for different surfaces? 
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  4 - Why wood the silicone that I apply not hardens?
        An application not hardening (not curing) is typically due to aged product, so that the chemical that makes silicone harden is no longer active. Silicone sealants can be tested before using to ensure proper curimg by placing small amounts on a pice of cardboard and watcing for a skin to form on the surfaces of the silicone. If no skin has formed after 15 miutes, the silicone is probably too old and will not cure. Sealants should cure within 6-24 according to humidity and bead size. We say normally because humidity affects the curing process and different parts of the country experience varying degrees of humidity. Lack of humidity will retard this process. If the product shows sign of curing, such as a change in original consistency ıt will cure.ıt just may be taking longer than normal. It may take up to 48 hours for sealant to cure under extreme conditions.

  5 - Should silicone turn yellow after they are applied?
        Silicone products very rarely yellow. However ther are in which h yellowing may occur, such as, use of silicones around other adhesives, use of harsh chemical or consistent exposure to hard water. Silicone bathroom tube & tile sealant can yellow when used outdoors or in areas of high UV exposures. 

  6 - The flexibility and shore hardness of some silicone sealants in the market are too soft or very hard and variable flexibility, Why?
        Sometimes while compound process of the silicones some of the compounders are using different kind of additives. Like gelsolvents pouder etc. to reduce the cost of the material. The specific gravity of a high quality silicone should be between 1,00-1,05 the colors shuld be bright and at the clear silicone should be glossy transparent. A silicone compounded with solvents powders etc. has weak properties on adhesion sealing and gasketing. So you have to choose well-known brand names while purchasing this item.

 7 - Can I use silicone sealants under water?
       Silicone is a good waterproof material, but when used under water care must be taken to protect for 5 days after installation from direct contact with water.

 8 - Can I use silicone selants in food industry?
       Yes, but you should use the silicone contents no solvent when used, you must to the sealant for 3 days after application from direct contact with food.

 9 - What is Silicone?
       History: Silicones were developed for commercial use during World War II to meet military applications requiring extreme temperature resistance. Over the years, numerous advances have been made, improving tensile strength, elongation, tear, resistance, etc. In addition to its broad temperature resistant properties, silicone rubber now possesses physical values superior to a number of other synthetic polymers.


Properties: Silicone rubber is derived from inorganic silica (sand). Silicone rubber is made up of a backbone of silicone and oxygen atoms. This unique linkage is the same as that found in other high temperature materials such as quartz and glass. As a result, silicone rubber provides outstanding high and low temperature resistant properties as well as general inertness toward many deteriorating effects such as ozone, corona, weathering, UV rays, acids, bases, salts oils, fuels, fluids and food products.

  10 - What is Anaerobic?
          ALDA Anaerobic is one compound, polyester type resin functioned to cut the air contact between threads and provide a plastic adhesion and retaining.
When anaerobics used as a thin film in a metal surface, the metal shows a catalitic reaction and the material cured.
Though steel, ironi copper etc. surfaces show catalitic action, zinc coated and anodized surfaces are not applicable.
Anaerobics shows different full curing time according to metal surfaces. Like; bronz, brass ca. 2-4 hours, steel:4-12 hours, aluminum: 12-48 hours. The fastest curing is between threads. Heat resistance is 150°C.
Anaerobics don't contain any poisonous material so is very safe to use.
Anaerobics has a very high resistance to chemicals like; water, sea water, natural or synthetic oils, engine fluids, organic solvents, trichlorethylene etc.
Anaerobics has a dielectric strenght of mm/250 V.
Some of the anaerobics carries a speciality of filling gaps and cracks up to 0,25 mm.