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Impregnation means to soak through or 'cause to soak through'. Impregnation represents the impregnation of a porous solid with a liquid or other finely divided substance, with the aim of adding certain good properties. In the manufacture of fibreglass-reinforced plastics, for example, fibres are impregnated with a resin.

An impregnation layer is a layer that has the purpose of impregnation. Impregnate means to soak through or 'cause to soak through'. Impregnation represents the impregnation of a porous solid with a liquid or other finely divided substance, with the aim of adding certain good properties. In the manufacture of fibreglass-reinforced plastics, for example, fibres are impregnated with a resin.

Infusion technique is a method in which one places the fibre under vacuum (usually using a foil) and then allows the resin (sometimes using some pressure) to flow through the fibres. This technique is widely used in the production of yachts or boats.

A casting resin is a resin that can be used for casting (embedding) objects. An example of a casting resin is the GTS casting resin. Exists in polyester, epoxy and polyurethane base. for more info see: https://www.v-sure.eu/en/casting-resin-gts-mekp-0.5-kg

A retarder or inhibitor is a substance used to extend the gel time of a resin without having to shorten the curing time too much. Adding a retarder is recommended for pre-accelerated resins in warm periods. The most commonly used retardant is a 1% solution of PTBC. With an addition of 1-2% to the resin, one can approximately double or triple the gel time. An even stronger retardant is usually not desirable. for more info, see: https://www.v-sure.eu/en/inhibitor-p1-1-l

An interface is the connection point or contact surface between two different composite elements. In glass fibre reinforced plastics, the contact surface between the glass fibres and the resin is meant. In laminates, the contact surface between the reinforcing element and the laminating resin is meant.

Interlaminar stresses are stresses (shear, tensile and compressive stresses) that can occur in composites between the different layers of the laminate.

In isophthalic polyester resins, one uses propylene glycol. Once you replace all or part of it with neopentyl glycol, you get resins with even better hydrolysis resistance. In addition, these resins, which are composed of both isophthalic and neopentylglycol, are heat-resistant and show good adhesion to PVC. For more info, see: https://www.v-sure.eu/en/h35-iso-resin-lse-5-kg

Polyurethane is produced from two main components, polyol and isocyanate (iso for short). The iso groups (functional group: -NCO) enter into a chemical reaction with the polyol groups to form the plastic.

An isophthalic resin is suitable for all weather conditions and protects against many acids and bases at ambient temperature.

Isophthalic acid or 1,3-benzenedicarboxylic acid is a colourless, crystalline powder that is insoluble in cold water and poorly soluble in boiling water. The melting point of isophthalic acid is 345-348°C and the auto-ignition temperature exceeds 650°C. The relative density of isophthalic acid is greater than that of water, at 1.54. This equates to a specific gravity of 1540 kg/m3.

Isophthalic acid resin is a liquid polyester resin. The properties of liquid polyester resin, including the cured product, are primarily determined by the types and quantities of raw materials used to make polyester. Those raw materials are glycols and acids. In the case of isophthalic acid resins, the type of acid used is isophthalic acid. These resins have higher chemical resistance and better mechanical properties and are more resistant to heat compared to orthophthalic acid resins. In addition, these resins are especially resistant to water and ammonia.

Propylene glycol is used in isophthalic polyester resins. Once you replace all or part of it with neopentyl glycol, you get resins with even better hydrolysis resistance. In addition, these resins, composed of both isophthalic and neopentylglycol, have good heat resistance and show good adhesion to PVC.

Isotropic substances are substances whose natural properties such as elasticity, thermal conductivity, refraction of light, permeability of magnetism do not depend on direction. Anisotropy, on the other hand, is a phenomenon where crystalline substances, for example, have different properties in different directions.