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Hong Ye Silicon »Silicon Products » RTV-2 Silicone Rubber

RTV-2 Silicone Rubber

    1. HY-728 Moulding Silicone RubberNumber: HY-728
      Distribution time:2010-06-16
      Usage: For the duplication and mold making of glass crafts, lighting, candle, culture relics duplications.
    1. HY-638 Moulding Silicone RubberNumber: HY-638
      Distribution time:2010-06-16
      Usage: For toy gifts and craftwork gift, products with complex fine details, and made in pouring way.
    1. HY-725 Moulding Silicone RubberNumber:HY-725
      Distribution time:2010-06-16
      Usage:For the mold making of large size products making in multiple pieces, reliefs, arts & crafts.
    1. HY-620 Moulding Silicone RubberNumber:HY-620
      Distribution time:2010-06-16
    1. HY-238 Shoe Mold Rubber Number:HY-238
      Distribution time:2010-06-21
      Usage:Shoe soles mold, sand casting,brushing mold.
    1. HY-218 Shoe Mold RubberNumber:HY-218
      Distribution time:2010-06-21
      Usage:Shoe soles mold, pouring mold, sand casting.
    1. HY-570 Manual Mold Silicone RubberNumber:HY-570
      Distribution time:2010-06-21
      Usage:For large size products, master mold design, electronic product printing positioning.
    1. Mould Silicone Rubber HY-625Number:HY-625
      Usage:For the duplication and mold making of glass crafts, lighting, candle, culture relics duplications.
    1. Mould Silicone Rubber HY-630Number:HY-630
      Usage:For toy gifts and craftwork gift, products with complex fine details, and made in pouring way.

RTV-2 silicone rubber

Our RTV-2 silicone rubber is classified into molding silicone rubber, manual mold silicone rubber and pad printing silicone rubber, etc. The molding silicone rubber is mainly used for mold manufacturing of either large or small articles, sculptures, Buddha, and opening collapsible molds. As per the manual mold silicone rubber, it is widely used for the duplication of manual mold, low melting point alloy dies and toys. The pad printing silicone rubber is an integral printing unit of pad printers.

The following will describe for you detailed information about our RTV-2 silicone rubber.

Operation Instruction for RTV-2 Silicone Rubber
Step One: Take 100g of part A and add 2g of part B and mix the silicone rubber and curing agent evenly.
Our mould making silicone rubber is a kind of flowing liquid and it contains two parts. Part A is a kind of white flowing liquid and part B is the curing agent. Remember to mix part A and part B evenly, otherwise the silicone rubber will be partly solidified and this will give birth to difficulties in your final operation. What's more, the finished moulds will meet a short life. All of these will cause a waste of silicone rubber.

Step Two: Vacuum Pumping
Without exception, this step takes less than 10 minutes. Otherwise, it will cause cross linking reaction, and no more further steps will be available.

Step Three: Brushing cast & Perfusion Molding operation
(1) Brushing cast:
a. Evenly brush the mixed silicone rubber on the product which is covered with mold spray with a brush or a brush pen.
b. After the cross linking reaction (about 30 minutes), brush a second coat which can increase the tension and tear strength of the mold.
c. Cover a glass cloth on it after another 30 minutes of a second cross linking reaction, and use a brush pen or a brush to avoid any interstices.
d. Cover a third coat.
(Note: if you have high requirements for the tension and the tear strength for the mold, please repeat step c and step d. Hence, the finished silicone moulds will have a good quality and a longer life, which can help you save cost and increase production efficiency.)
(2) Perfusion moulding
It is suitable for simple products with the smooth surface. Without any mold lines, which helps you save time and is easy for operation. Evenly and slowly perfuse the mixed silicone rubber into the square frame. After the cross linking reaction and the silicone rubber turns dry, you can take the products out. Thus, the mold has been done.
(Note: we usually use soft silicone rubber to make molds by perfusing, which is easy for demoulding and will not damage the product in the silicone molds.)

Step Four: External Mold Making
Operations for the external mold
(1) Make a square frame with four pieces of wooden boards or rubber plates, then place the product which is covered with the finished silicone rubber mould in the middle.
(2) Slowly and evenly perfuse the gypsum into the square frame. Also you can brush the resin on the product which is covered with the finished silicone rubber mould with a brush or a brush pen. Repeat this process two or three time after the cross link reaction.

FAQ of RTV-2 mould making silicone rubber
1. Why could the silicone mold be reused only for a few times?
It can be due to the following reasons:
a. Adding too much silicone oil into silicone rubber. Silicon oil is an additive which destroys the molecular weight of silicone rubber and reduces the tension and tear strength.
b. Using the silicone rubber with a high hardness to make molds for small sized products with delicate and intricate designs and the silicone rubber with a low hardness to makes molds for large sized products with simple designs.
(Notes: we should choose the silicone rubber specifically according to the requirements of our products to avoid this problem.)

2. Why does the silicone mold get burnt out?
This consequence happens only because you have left out the important notes when using unsaturated resin materials to produce your products. The unsaturated resin produces great heat when added the curing agent. So you must demould the product within 3 minutes to avoid this problem.

3. Why does the silicone mould appear to be dry outside but wet inside?
Because molding silicone rubber is a kind of condensation silicone rubber, which get solidified after absorbing moisture from the air. In order to provide a significant shelf-life for the silicone rubber, we will dry out the water in the silicone rubber.
Solution: Add 0.05% water into the silicone rubber and Stir over a low speed briefly when you use it.

4. Why is the tear strength of the silicone mold weak?
In order to reduce the viscosity of silicone rubber and pursue a good quality, you may add a lot of silicone oil into the silicone rubber when making molds. In fact, it might have just the opposite effect. The tension and the tear strength will be reduced badly with the addition of silicone oil. And the silicon molds will be in a weak and flimsy manner.

5. Why is the silicon mold oily?
The molding silicone rubber itself doesn't contain any oil, so it won't be oily. If the mold is oily, it may be because you add the compound silicone oil( the compound of silicone oil and white oil). The white oil is not silicone oil but a kind of petrochemicals.

6. Why isn't the silicon mold acid & alkali and aging resistant?
It is due to the addition of the silicone oil. Normally we do not advise our customers to add any silicone oil into the silicone rubber. If it is necessary, the ratio must be 5%-10%.

7. Why is the appearance of the finished mold striate and unsmooth?
It is because the appearance of the product or the model itself is not perfect, and it has not been polished before the further operation. So when you make silicon molds, firstly you should polish the product, spray the mold spray evenly on the product. In this case, the problem can be avoided.