Polygum is a two-component liquid polyurethane rubber with 60 Shore A hardness. This rubber is ideal for making prototypes, technical articles or functional rubber parts that can withstand considerable mechanical and chemical stresses. Furthermore, it can be used to make very elastic molds or casts for subsequent pours of concrete or silicone rubber.
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Polygum is a two-component liquid polyurethane rubber that hardens at room temperature and with 60 Shore A hardness (medium). This rubber is ideal for making prototypes, technical articles or functional rubber parts that can withstand considerable mechanical and chemical stresses. Furthermore, it can be used to make very elastic molds or casts for subsequent pours of concrete or silicone rubber.
Polygum polyurethane rubber is commonly used in different sectors and processes. For example it is applied in the field of rapid prototyping, in craftsmanship or in industrial production (gaskets, encapsulations, protective, prototypes, etc.) or in the field of scenography, special effects or cosplay.
Polygum after mixing the two components in a ratio of 100:33 (in weight), it hardens rapidly to become a very elastic rubber, with good hardness and high physical-chemical resistance.
It has quick processing and demoulding times. At the end of the hardening process the rubber will appear in a transparent-amber color. This coloring can be best used to obtain rubber models with full and bright colors by adding special polyurethane color pastes to the rubber during the preparation.
The low viscosity of Polygum rubber allows the best penetration even into the finest details of the mold, always guaranteeing perfect reproduction of details without any linear shrinkage.
The product can be poured into molds / molds in silicone rubber without the need to apply a release agent, or inside epoxy resin, polyurethane resin, polyester resin, polyurethane rubber or latex by pretreating the casts with a release agent waxy.
Elastomeric two-component polyurethane system with 60 Shore A hardness, high elongation and good tear resistance. The product reaches its final characteristics after 7 days at 25 ° C.
|Part A||Part B|
|Viscosity at 25 ° C (mPas)||2300-2700||120-160|
|Density at 25 ° C (g / ml)||0,95 – 1,05||1,05-1,15|
|Mix Ratio (gr)||100||33|
|Time of use (100 ml, 40 mm, 25 ° C)||8-12 min.|
|Gelation time (15 ml, 5 mm, 25 ° C)||15-20 min.|
|Minimum mold removal time (15 ml, 5 mm, 25 ° C)||15-18 h.|
|Maximum casting thickness||50-60 mm|
TA = room temperature (23 ± 2 ° C)
Conversion factors: 1 mPas = 1 cPs 1MN / m2 = 10 kg / cm2 = 1 MPa
USE OF THE POLYURETHANE POLYGUM 60 RUBBER
In general there are two main phases that are carried out for the use of polyurethane rubber: mold preparation phase and the mixing / use phase of the rubber.
1) PREPARATION PHASE OF THE LIME FOR THE POLYURETHANE RUBBER
The molds / molds used to cast the POLYGUM 60 polyurethane rubber can be made with different materials such as epoxy resins, polyurethane resins, polyester resins, leather, metal, plaster, wax, cement, wood, plastics, glass, ceramics, clay, rubber, natural stone, glass or other materials.
Before proceeding with the use and pouring of the polyurethane rubber in the molds it is ALWAYS necessary to treat the casts in advance (not made of silicone rubber) with special release agents that can be made with synthetic waxes (wax releasing agents) or deriving from emulsions of silicone oil (silicone release agent). Both can be applied with a brush or spray method.
In the application of release agents, two situations must be subdivided according to the material of the cast. In non-porous materials such as rubber, glass, metal, plastic materials, etc. the release agent can be directly applied to the surface of the cast. While on all porous surfaces such as cement, plaster, clay, wood, etc. a preventive treatment is required of turaporate products (eg turapor with shellac, polyvinyl alcohol, polyurethane paints, paste wax, nitro turaporos) necessary to close all the micro-holes present on the surface and prevent the liquid polyurethane rubber from penetrating into it making the demoulding phase is very difficult.
After applying the filler it is necessary to wait for the complete evaporation of the volatile part (water or solvent) before applying the release agent layer.
Regardless of the type of surface and the need to close the pores or not, the release agents must ALWAYS be applied as they not only favor the phase of removal of the polyurethane rubber from the mold, but avoid a possible reaction between the polyurethane rubber and some insulating varnishes (with consequent adhesion between the two components).
2) MIXING AND USE PHASE OF POLYURETHANE POLYGUM 60 RUBBER
Shake / mix the two components A and B separately to homogenize them.
Through the use of clean containers and a precision balance (with division 1g) weigh the two components in a ratio of 100:33 by weight. Start by weighing component A and then calculate the amount of hardener required.
Combine the two components together and mix thoroughly for a few minutes, scraping the edges and bottom of the container. To avoid that some parts are not perfectly mixed it is recommended to transfer the mixture into another clean container, mix again (and if necessary add the color paste as well) and then when homogeneous pour into the mold.
The mixture obtained is poured flush and slowly so as to avoid incorporating air. It is important to remember the described workability times of POLYGUM polyurethane rubber. The processing times and those of hardening change change with the room temperature, in fact higher temperatures accelerate the reaction time and reduce the workability time of the product.
All the characteristics of the rubber (timing, characteristics and complete maturation) are included in the table above and are very important to obtain an optimal final result.