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Addition (silicone)
Curing only by combining two or more components. Addition based silicones cures by platinum.

Seaweed-based impression mass. Perfeclty for body casting.

Density or specific weight is the weight of a material at a given volume. The density is indicated in kilograms per cubic decimeter or in grams per cubic cc. In comparison, the density of water is 1.00kg / dm3.

Compressive strength
Amount of pressure a material can tolerate.

One-time form / single form
Mold of which only one molding can be made by leaving the molding disappear after molding.

Fabrics with adjustable elasticity. Rubber-like materials such as silicone and PU polyurethane rubbers.

Epoxy resin
Thermosetting synthetic resin used for casting. Epoxy is also used as a raw material for highly adhesive adhesives.

The effect that a material develops its own heat through a chemical reaction to cures

Process in which iron is coated with zinc to prevent rusting.

The hardness of a fabric is measured with a Durometer. A special needle is pushed into the material. The further the needle can be pushed into the material, the lower the hardness. The hardness of rubbers is expressed in Shore A, of plastics in Shore D. Both scales are classified from 0 to 100. Most silicone rubbers have a hardness from Shore A 10 to Shore A 60. Much polyurethane rubbers we have in Shore A 20 up to Shore A 97 In comparison: the hardness of a gummi bear is Shore A10, elastic rubber is Shore A 30, a car tire is Shore A 70, a skate wheel is Shore A 90 and a very hard plastic is Shore D 90.

Hollow casting
Method to make a hollow model by means of rotation technique. So not solid.

Mix homogeneously
Mix until an evenly distributed mass is obtained.

Substance that initiates a chemical reaction without taking part in the reaction itself. Also called accelerator. A catalyst, which is usually already part of the ars, reacts with the hardener, generating heat that initiates the hardening process. it is the curing component.


Shrinkage is the decrease in the volume of a material due to cooling or because a substance disappears from the material, such as water or plasticizer.

Transition from liquid to solid form. some polyurethane products are moisture sensative and cures in the open conatainer.

A rubber, resin or plaster can be made brushable by adding an thickner additive. The material can then be applied with a brush.

Type of rubber used as a cold-workable molding material and as a raw material for certain adhesives.

Release agent
A means that promotes the release of a model or mold. you have to apply on the surface to get loossen the mould or part.

Air duct
Duct fitted in a model to remove excess air.

Mold, shape
Negative shape or print of a design in which a copy or cast of the original in another material can be made.

Master model / mother model
The model with which a mold is produced. Also called master model.

Refractory chamber of a furnace used to protect workpieces from the direct action of flames or furnace gases.

The temporary heating of, for example, PU resin to prevent subsequent gasification.

Demolding time
The demoulding time is the minimum time after which a model can be removed from the mold without being damaged or after which the mold can be released from the model.

Colored layer that forms on metal images due to chemical changes under the influence of the atmosphere. These changes can also be brought about artificially.

Smooth finishing of a model, for example by means of polishing powder or polishing paste

A compound built up by the addition (joining) of similar molecules.

Polymers of dicarboxylic acids and diols, raw material for plastics

Polyester resins
Liquid synthetic resins that cure under the influence of an added hardener (catalyst)

Plastic produced by poly addition. Mainly used as a thermoset, sometimes also as a thermoplastic.is cames in rubber, foam and plastic liquids.

Pore ​​sealant  /sealers
Agent that prevents rubber or casting resin from penetrating the pores of a model. The use of pore sealer is necessary with porous models such as wood, stoneware or plaster. sealer!

Degree of permeability.

Rotational molding / rotocasting
Production process in which casting is done by means of rotation.

R (oom) T (emperature) V (ulcanising), curing at room temperature.

Silicone rubber
Synthetic rubber, made up of silicon oxygen chains

Spatula mold
Mold made by splashing material.

Mold shells, formwork
A support cap or formwork ensures that a flexible mold stays in good shape. Support cap or formwork can be made of, for example, plaster, casting resin, polyester, wood or metal.

A syrup mold is a mold that can be stripped like a sock. Syrup molds are usually made from polygel or latex.

Vinyl compound is a raw material for various plastics such as polyester.

Artificially manufactured

Thermosetting plastics
Designation for plastics such as polyester and epoxy resins that require heat during the molding process but which cannot change shape once they have hardened.

Plastics that soften when heated and hard when cooled without changing their properties. An example of this is acrylic.

Tensile strength
That is the force required to tear material. It is expressed in pounds per square inch of material (how many pounds are required to rip a square inch). Some rubbers, especially silicones, tear very quickly if a crack has developed once.

Curing time
The curing time indicates the period within which the material is fully cured. After the curing time has elapsed, the material no longer changes. Note: a material can already feel cured after the demoulding time.

Airless. Schouten SynTec® recommends mixing most products under vacuum and allowing them to cure under vacuum or pressure. The vacuum causes air bubbles to escape from the material and details are better displayed.

Vacuum forming method
Method of shaping plastic over a relief pattern. The plastic is heated until it is soft, after which it is pulled tight like a skin over the cartridge with a vacuum.

Lost wax method
The traditional technique for casting a wax model in bronze. A refractory mold is made around a wax model, after which the wax is distilled out. Liquid metal is poured into the space that this creates in the mold. When the metal has cooled, the mold is cut away and the resulting model cleaned and finished.

Also called a catalyst, see catalyst.

Processing time
The pot life is the time between the start of the mixing of both components and the start of the hardening (thickening). The processing time therefore indicates how long a material can actually be processed. However, most materials should be processed well before the end of the pot life. The best detail reproduction is then obtained and air bubbles are allowed to escape.

The viscosity indicates how thick or thin a liquid is. The viscosity is indicated in centipoise (cps.). A thin liquid has a low viscosity (e.g. water, 1 cps.). A thick, viscous liquid has a high viscosity. The temperature influences the viscosity. Low temperatures increase the viscosity, high temperatures decrease the viscosity.

In the liquid state, the chains move as a whole with respect to each other. However, the many entanglements have to be pulled apart again and again; therefore the viscosity of liquid polymers is very high. For comparison with other substances, the table gives a number of values ​​for the viscosity, expressed in Pa s (= N s / m2 = 10 poise) at 20 ° C unless stated otherwise.

Water 0.001 Alcohol 0.0012 Liquid metals 0.001 – 0.002 Olive oil 0.08 Machine oil 0.1 – 0.5 Polymers 100 – 10,000 (at processing temperature)

Refractory plaster
A combination of investment compound and plaster produces a heat-resistant plaster of up to 1080 ° C.

Plasticizer / fluid
Liquid to reduce the Shore A hardness of polyurethane or silicone rubbers.

* The mixing time, pot life and pouring time depend on the temperature, the environment and the relative humidity value.


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