DIN 16945 Reaction Resins, Reactants and Reaction Resin Masses - Test Procedures

The standard "DIN 16945 Reaction resins, reactants and reaction resin masses - Test procedures" developed by the German Institute for Standardization (DIN) describes test methods for testing resins, hardeners and accelerators and catalyzed resins. This standard is designed for testing reaction inhibitors, reactants (hardeners, accelerators and similar) and reaction molding materials.

Reactants or hardeners are accelerators or heat activated chemicals that promote gelation and curing of the polyester resin vinyl ester resin matrix. They initiate crosslinking reactions between the resin and reactive monomers such as styrene. Methyl ethyl ketone peroxide is active at room temperature for curing polyesters and vinyl esters. Benzoyl peroxide is active above 80 degrees and is also used with amine accelerators at ambient temperature for curing systems. Phthalate free grades are recommended when required.

Epoxy resins are a type of chemical compound that has revolutionized the construction industry. Their incredibly versatile polymer properties make them ideal for a wide variety of uses in construction. Due to their exceptional chemical, heat, and moisture resistance and adhesive abilities, they are useful as adhesives, coatings, corrosion-resistant polymers, sealants, and the like. Therefore, there are many benefits to using epoxy resins. These materials are also designed to help with the repair and maintenance of concrete structures.

Epoxy resins are chemical compounds that belong to a specific class of polymers and prepolymers. They react with epoxy resin hardeners and curing agents such as phenolic compounds, polyamines or aminoamides to form a durable material. For this reason, many manufacturers' epoxy resin-based construction chemicals are extremely popular in the construction industry today.

Epoxy is a broad term that includes a selection of reactive compounds, especially those with an oxirane or epoxy ring. It belongs to a three-membered ring containing an oxygen atom with two carbon atoms connected to each other. The epoxide molecules within it create differences in molecular basis and produce different types of epoxy resins.

These resins are extremely versatile as different types of epoxy chemical structures can be produced using the same chemical reaction. These epoxy resins can be combined with modifiers and curing agents to provide properties for a wide range of construction applications.

The main features are determined by the test methods defined in the DIN 16498 standard:

• High mechanical strength: Epoxy resins have significantly high mechanical strength. For example, epoxy resins are used to repair joints and as fillers instead of traditional welding, as they are a more effective but cheaper alternative.
• Low shrinkage: Adhesives made from epoxy resins have a lower degree of shrinkage than other types of polymer-based adhesives. This is beneficial because even fully reactive compounds can experience some shrinkage during the curing process.
• Excellent adhesion: Epoxy resins also have excellent adhesive properties because they can easily react with many compounds and other resins with low molecular weight. As a curing agent, it can effectively help improve various properties of the construction adhesive used, such as cohesive strength, bonding strength, hardness, toughness, flexibility, and resistance to chemicals and heat.
• High electrical insulation: Epoxy resins are also widely used in various electrical devices such as motors, generators, insulators, bushings, and switchgear. They are strong electrical insulators and protect electrical components from damage caused by moisture, dust, and short circuits.
• Improved chemical resistance: Epoxy-based resins have significant resistance to a variety of chemicals, including sodium hydroxide, sulfuric acid, methanol, acetone, and organic acid types, depending on the formula. Additionally, epoxy resins also have higher resistance to solvents.

Epoxy resins are easy to cure and compatible with a variety of substrate types. They can easily wet surfaces effectively, making them suitable for multiple uses. They can also modify various polymers, such as unsaturated polyesters and polyurethanes, to improve their chemical and physical properties.

Epoxy resins are molded in the 50 percent to 100 percent temperature range and have higher viscosity levels. Curing agents and catalysts, such as hardeners or accelerators, can react with the resins directly or through a catalytic action.

Different types of epoxy resins include:

• Heat-cure epoxy: Heat-cure epoxy has a variety of industrial uses, but is not used in the construction industry because it requires high heat levels to cure. For example, the minimum temperature required to cure these types of epoxies is around 200 degrees Celsius, which is not possible during construction. However, these resins have the highest flexibility and are widely used in a variety of applications, such as medical devices, electronic components, infrared telescopes, and missile warning systems.
• Two-part epoxies: Two-part epoxies are designed to contain two separate components required to create a chemical reaction. When the resin is mixed with a hardener, it turns from a thick liquid to a paste-like substance in about 24 hours, eventually settling into a hardened raw material. Once the epoxy has set, it can be scraped off, but if necessary, it will need to be softened a bit with a bit of thinner or rubbing alcohol. These epoxy resins are also very versatile and are used in a variety of industries, including automotive, manufacturing, aerospace, and construction. These resins are highly useful in construction projects that use concrete components such as protective decorative moldings.

Our organization has a strong staff that closely follows the developments in the world in the field of science and technology and constantly improves itself. Among the numerous test, measurement, analysis and evaluation studies provided for businesses in various sectors, there are also testing services in accordance with the standard "DIN 16945 Reaction resins, reactants and reaction resin masses - Test procedures".