Not capable of causing harm to the environment. Not harmful or destructive to human health. Not poisonous, harmful, or otherwise destructive to an organism upon exposure.
Being a fluid like material, this material will move with dissimilar substrates and mechanical coatings, the material does not set, harden, or dry throughout its life time, thereby creating no stress in the mechanical coatings.
A cross-link is a bond that links one polymer chain to another.They can be covalent bonds or ionic bonds. "Polymer chains" can refer to synthetic polymers or natural polymers (such as proteins). When the term "cross-linking" is used in the synthetic polymer science field, it usually refers to the use of cross-links to promote a difference in the polymers' physical properties. There is no inducement of stress, due to non-hardening.
Osmosis is the tendency of a fluid, usually water, to pass through a semi-permeable membrane into a solution where the solvent concentration is higher, thus equalizing the concentrations of materials on either side of the membrane. It is the diffusion of fluids through membranes or porous partitions. STOPAQ does not have this aspect as a corrosion protection material.
Not consisting of or containing the nature of crystals. A crystalline solid has its molecules (or atoms) arranged in a lattice. That is, they are arranged in a regular fashion with equal spacing and angular relationships in all three directions. A non-crystalline solid, also called amorphous, has no such regular arrangement of molecules. Non-Crystalline Solids: Covalent Compound, Lower Melting/ operating down to -65 degrees centigrade, once past this stage and returns/ it structures itself back into its original state and does not conduct electricity at any state.
Sealants are often classified as either hardening or non-hardening. Hardening sealants are applied as a heavily bodied fluid, and they "set" to form either a rigid or a flexible solid seal.Hardening sealants can be further sub-divided into rigid and fixable classifications. Rigid sealants have little or no resiliency and are characterized by their inability to flex. These are commonly used when both sealing and structural holding functions are needed. They are represented by epoxides and acrylics. This will cover all liquid coatings that are two part and are catalysed to allow them to set. This also applies to solvent based materials which (dry) by the solvent leaving the base material.
Non-hardening sealants do not "set". They stay "wet" or flowable after application and have physical properties similar to before they were applied (visco elastic). It should be noted, however, that although non-hardening sealants remain soft after application, they might still go through a chemical conversion, solvent evaporation, or some other "curing" mechanism, such as silicone type material. STOPAQ, being a visco elastic material, remains in a fluid state without any chemical change or set.
The cathodic disbondment (CD) test is a well-known and generally accepted laboratory test for pipeline coatings. Good test results (low delamination radii) indicate that the coating is expected not to delaminate to a large extent in the presence of cathodic protection and a small coating damage with the steel surface exposed to the soil. This makes the CD test essential for quality control of pipeline coatings.This test method provides accelerated conditions for cathodic disbondment to occur and provides a measure of resistance of coatings to this type of action.Typical example of coating disbondment
As per standard tests 28day, -1.5v 3% sodium solution, ambient temp;
FBE (fusion bonded epoxy) >6-8 mm
Sintered mdpe polymer >15/17mm
Liquid polyurethane >8-11mm
Liquid epoxy >8-12mm
Bitumen type >11-14mm
Stopaq Visco elastic polyisobutene ZERO disbondment (with its self-healing capability, -3mm defect, healing closed)
The term inert is used to describe a substance that is not chemically reactive. This means it is not readily reactive with other elements; forming few or no chemical compounds.
Amorphous means that it is lacking definite form; having no specific shape; or formless. Something amorphous has no real shape or is irregularly shaped—like pudding; an amorphous solid lacks the perfect ordered structure of crystals, as a result it can conform to any shape.
Microbial corrosion, also called bacterial corrosion, bio-corrosion, microbiologically influenced corrosion, or microbially induced corrosion (MIC), is corrosion caused or promoted by microorganisms, usually chemoautotrophs. It can apply to both metals and non-metallic materials.One of the more unusual forms of corrosion results from the interaction of bacteria with a wide range of metals and alloys. Microbiologically Induced Corrosion (MIC) technically functions as an accelerant to more conventional corrosion processes. The rate of acceleration, however, may be from 10 to 1000 times conventional corrosion rates, requiring that MIC be addressed as a distinct corrosion process from a practical standpoint.
MIC initiates and propagates primarily by two processes; The first is the formation of corrosion cells on a metal surface. Colonies of micro-organisms generate sticky biofilms with which they adhere to their host surface and create a micro-environment that is significantly different from the surrounding metal. Variations in dissolved oxygen, pH, and organic and inorganic compounds in these micro-environments result in electrical potential differences with the surrounding metal, producing highly active corrosion cells.
The second is by direct chemical attack. The metabolic by-products of many micro-organisms are highly corrosive. Two related organisms—sulphur reducing bacteria (Disulfovibrio) and sulphur oxidizing bacteria (Thiobacillus thiooxidans)—produce hydrogen sulphide and sulphuric acid respectively. Localized sulphuric acid concentrations from these by-products as high as 10 percent have been observed. Other bacteria species produce a wide range of organic acids, as well as ammonia.
This behaviour results in three significant differences versus conventional systems:
•As a result of the very low surface tension, STOPAQ shows an excellent wetting of the steel surface, its attachment to polymers like PE, PP, FBE cement, brick, glass, PIB is at a similar level. There is no substrate within the coatings being used in corrosion protection materials that it does not attach and seal. This combination of low surface tension and the liquid like behaviour of the polymer, causes impregnation of the steel surfaces, which favours corrosion protection.
•Because of the liquid like behaviour of the material and the glass transition temperature being lower than -50 degrees C, it will not tear, break, or build up internal stresses.
•Further being able to operate at 95 degrees centigrade on a continuous basis.
•Due to its cold flow characteristics, it will even adhere in cold temperatures of -20 C.
•Application is done requiring no heat.
Advantages of Visco-Elastic Systems
All Mill Scale must be removed, thereafter a min. ST 2/3 hand tool or wire brush cleaning according ISO 8501.
-no tools or special primers needed
-no preheating requirements
-cold application possible
STOPAQ Visco-Elastic Corrosion Prevention + (selected mechanical )
Mechanical Protection Layer
Warranty: 30 years
No risk of:
- osmosis or M.I.C
- no adhesion due to wrong anchor pattern
- adhesion failure to PE, PP bituminous , FBE, Glass fibre, PVC, HDPE, Cement
- application failure
- Metallic and non-metallic surfaces
- Fusion bonded epoxies
- Bituminous coatings
- Glass fibre