SGPU M60 is a two-component urethane rubber that cures at room temperature (RTV) by exotherm to a hardness of approximately Shore A 55 to Shore A 60. This semi-rigid cast rubber has a beige-white color and can be easily colored with, for example, the Color paste. The SGPU M60 is widely used for making molds and polyurethane parts with medium medium hardness or flexibility.
The great advantages of the SGPU M60 is that the rubber has a fairly fluid and low viscosity, a fast demoulding time and a high tear strength. The SGPU has a mixing ratio of 100:19 and that is accurate. Make sure that this rubber is at room temperature before you start working. because the mixing ratio is 100:19 you have to make sure that it is well mixed.
In addition to the release agents, various additives are available for polyurethane rubbers. CAB-O-SIL is a thickening product for thickening the polyurethane cast rubber. This viscosity-increasing additive ensures that the rubber can be used for a spatula or brush mould. In addition to the thickener, we have various release agents, UV stabilizers, thinners and color pastes for coloring the rubber.
Packaging: Set 1.190 kg, Set 5.95 kg, Set 59.5 kg, drum packaging on request
Hardness (Shore A): 55-60
Mixing ratio: 100A:19B (by weight)
Color: white beige
Working time (min.): 15-20 minutes
Curing time 300 grams / 30 mm 25 C: 1-2 hours (demold) / 7 days (100%)
Curing time 300 grams / 5 mm 25 C: 15 hours + (demold) / 7 days (100%)
Curing time 300 grams / 30 mm 60 C: 1-2 hours (demold) / 7 days (100%)
Viscosity (cP): 1,000
Tear strength (N/mm2): 14.8
Tensile strength (MPa): 7.0
Linear Shrinkage (500 x 50 x 10mm): 0.036%
Product Type: Polyurethane Rubber
Application: for the production of medium hard rubber products or molds for, among other things, concrete, plaster, epoxy and polyurethane, rubber casting parts.
Release & Adhesion:
Polyurethane casting rubber such as the poly 75-70 adheres when casting on many surfaces such as various types of metal, wood, polyurethane, plastics, epoxy materials, concrete, plaster and many other surfaces. If release is required on these substrates, release agents such as our PPol-Ease 2300, Lossingsmiddel VL, Pol-Ease 2350 and Pol-Ease 2450 or the other release agents must be used. We always advise to do a test first with the adhesion, release or the suction effect of the rubber on the mold or application. With porous parts made of, for example, wood or plaster, the rubber can be sucked up. You can prevent this by first sealing it with, for example, a porieverzegelaar.. This is not a release agent, so if it still needs to be released or is poured with a material that will give you adhesion, use a release agent.
As standard, a polyurethane does bond and silicone does not bond to different materials. This adhesion or no adhesion is not available with every material. If you want to generate extra adhesion for, for example, (mechanical) load, we always advise to optimize this by using an adhesive primer for the different substrates. This gives a good bond for both materials. Before using this adhesive, the surface must be thoroughly cleaned and degreased. Blasting or roughening the surface promotes adhesion with or without a bonding primer.
Casting polyurethane on a material with which no adhesion is created therefore does not require a release agent. Most silicone casting rubbers such as our silicone Eurosil, Platsil (addition silicone) and SG C-sil (condensation silicone) do not bond with the polyurethane materials. So no separate means is required here. It is possible, however, that when you use the molds intensively, the releasing effect can become less. Then use the release agent before you start pouring.
Always make a test piece before you get started.
Preparation – mold preparation
Make sure the mold you are going to use is clean and dry. If the mold is made of wood, metal or a resin, use a release agent such as our release agent VL, Pol-Ease 2300, 2350 or 2450. If you want to use flexible molds, make molds from our silicone casting rubber such as Eurosil addition silicone or SG C-Sil (condensation silicone) silicone rubber. If the mold is made of wood, make sure the wood is properly sealed with a sealer (pore sealer) lacquer and/or wax based release agents.
Preparation of this resin and mixing instructions.
Mix the resin component (Part A) thoroughly until it is completely homogeneous and thus no color difference or oils are visible.
Then mix the two components (A+B) in the correct ratio (100A:19B) and mix gently and gently to avoid air entrapment. In order to obtain a bubble-free unit, we recommend degassing the material in a degassing chamber after mixing and/or pouring. The degassing should not be longer than 10 minutes to prevent gelling during the degassing.
The molded part can generally be demolded in 1-2 hours at room temperature (RTV). If the casting has thin sections, it is recommended to use preheated molds (50-80°C), or post-cure in an oven at 50-80°C. Curing at high temperatures will increase shrinkage, but will
drastically speed up demoulding times.
Always close the packaging immediately and properly.