High Tear Tensile Strength Brushable Liquid Silicone Rubber for Automation Silicone Vacuum Bagging

• Customization: Available
• Material: Organic Silicone
• Application: Household, Medical, Industrial, Food
• Model NO.: GTSIL-RVB00~RVB40
• Certification: FDA, REACH, RoHS, MSDS
• Hardness: 00-40 Shore a
• Colour: Translucent or Adjustable
• Viscosity: Adjustable
• Shelf Life: 10 Months or 12 Months
• Certificates: FDA;MSDS;Reach;RoHS
• Mixing Ratio: 1:1 or 10:1
• Type: Platinum Cured Liquid Silicone Rubber
• Transport Package: Buckets/Drums
• Specification: 500g; 1kg; 5kg; 20kg; 25kg; 200kg
• Trademark: GT SILICON
• Origin: Dongguan. Guangdong, China
• HS Code: 3910000000
• Production Capacity: 500 Ton/Month

Product Description

Specification
Addition Cured Silicone Rubber for Mold Making, which is also named addition cure silicone rubber and platinum cure silicone rubber, is generally a two-component liquid silicone rubber vulcanized under room temperature(RTV-2).
 
Applications
Addition Cured Silicone Rubber has extensive use,such as mold making of foods (candy,cake, cookie,chocolate, ice cube, fondant etc), jewelries, tires, rapid prototyping,life casting,realistic mask,epoxy resin products,candle,vacuum foaming,making of prosthetic breast,artificial skin,human body,adult toys,baby feeding nipples,phone case and so on.

Techinical Parameters

Model Code	GTSIL-RVB00	GTSIL-RVB05	GTSIL-RVB10	GTSIL-RVB15	GTSIL-RVB20	GTSIL-RVB25	GTSIL-RVB30	GTSIL-RVB35	GTSIL-RVB40
Hardness-Shore A	0	5±2	10±2	16±2	20±2	25±2	30±2	35±2	40±2
Viscosity - Cps	2000+1000/-1500	3000-1000/-1500	3500-1000/-1500	3500-1000/-1500	20000±1000	14000-18000	6500-2000/-3000	8000-2000/-3000	8000-2000/-3000
Mixing Ratio - %	1:1/10:1	1:1/10:1	1:1/10:1	1:1/10:1	1:1/10:1	1:1/10:1	1:1/10:1	1:1/10:1	1:1/10:1
Tear Strength - KN/m2	>15	>9	>16	>18	>20	>22	>18	>16	>14
Tensile Strength - Mpa	≥2.5	>2	>3.8	≥5	>6	>6	>7	>7	>7
Shrinkage -%	0.1%	0.1%	0.1%	0.1%	0.1%	0.1%	0.1%	0.1%	0.1%
Elongation - %	≥800%	≥750%	≥700%	≥650%	≥500%	≥500%	≥500%	≥450%	≥400%

Instructions for mixing process.
 

Mixing Ratio	1:1 by weight
Pot Life at 80°C, approx	5-7mins
De-molding Time at 80°C, approx	60mins

Polymerisation: Curing condition: 1hr at 80 centi degrees.
 

Hardness	26 Shore A
Tensile Strength (N/mm2)	60+/- 10
Elongation (%)	600+/-50
Tear Strength (N/mm)	27+/-2

How to use

1.Substrate Preparation
The surface of the original should be clean and free of loose material. If necessary, and in particular with porous substrates, use a suitable release agent such as petroleum jelly or soap solution.


2. Mixing
Thoroughly stir Part A (silicone base) before use as filler separation may occur upon prolonged storage.
Weigh 100 grams Part A (silicone base) and 3 grams Part B (curing agent)  in a clean container. Mix together until the curing agent is completely dispersed in the base. Hand or mechanical mixing can be used, but do not mix for an extended period of time or allow the temperature to exceed 35°C (95°F). Mix suitably small quantities to ensure thorough mixing of the par A (silicone base) and part B (curing agent).

It is strongly recommended that entrapped air be removed in a vacuum chamber, allowing the mix to completely expand and then collapse. After a further 1-2 minutes under vacuum, the mix should be inspected and can be used if free of air bubbles. A volume increase of 3-5 times will occur on vacuum de-airing the mixture, so a suitably large container should be chosen.

Caution: prolonged vacuum will remove volatile components from the mix and may result in poor thick section cure and non-typical properties.

Note: If no vacuum de-airing equipment is available, air entrapment can be minimized by mixing a small quantity of par A (silicone base) and part B (curing agent), then using a brush, painting the original with a 1-2mm layer. Leave at room temperature until the surface is bubble free and the layer has begun to cure. Mix a further quantity of base and curing agent and proceed as follows to produce a final mold.


3. Pouring the Mixture and Curing
Pour the mixed Par A (silicone base) and Part B (curing agent) as soon as possible onto the original, avoiding air entrapment. The catalyzed material will cure to a flexible rubber within 24 hours at room temperature (22°C-24°C/ 71.6°F - 75.2°F) and the mold can then be separated from the original. If the working temperature is significantly lower, the cure time will be longer. If the room temperature or humidity is very high, the working time of the catalyzed mixture will be reduced. The final mechanical properties of the mold will be reached within 7 days.


ADDITIONAL INFORMATION

Reproduction of Vertical Surfaces
If a skin mold is required of a vertical object or surface and cannot be made by normal pouring techniques, the catalyzed mixture can be made non flowable by the addition of thixotropic agent.
1. Prepare the original as described earlier.

2. Brush the original with a thin layer of catalyzed mixture. Repeat the operation when the first layer has started to cure, to achieve a coating thickness of >2mm. Leave to cure at room temperature until the material is tacky.

3. Prepare a new catalyzed mixture of silicone and add 1% by weight of thixotropic additive and mix thoroughly until a paste consistency is reached. De-airing of the mixture is not required.

4. Using a spatula, cover the coated original with the thixotropic coating until all undercuts are filled; leave to cure for 24 hours at room temperature.

5. Construct a support mold using polyester resin or plaster and allow to set in contact with the silicone coating. Carefully remove the support mold. Peel the rubber off the original and place in the support mold.

Use at High Temperatures
Some molds produced from condensation cure silicone rubbers can degrade when exposed to temperatures above 150°C (302°F) over a period of time or when totally confined in storage at high ambient temperatures. This can result in softening and loss of elastic properties.

Resistance to Casting Materials
The chemical resistance of fully cured silicone rubber is excellent, and similar to all condensation cure silicone elastomers. It should be noted however that ultimately, resins and other aggressive casting materials will attack silicone molds, changing physical properties, surface release and possibly mold dimensions. Molds should be checked periodically during long production runs.


Shelf life
Twelve (12) months from date of shipment when stored at 25ºC in the original sealed packages.


Package
Silicone Packed in clean 25kg/pail, 200kg/drum.
Catalyst packed in 1kg/bottle.
 

Health and safety

1. Catalyst contains toxic element. Avoid contact with eyes. Flush eyes with water and seek medical attention. Remove from skin with waterless hand cleaner followed by soap and water. Children should not use this product without adult supervision.
2. GTSIL-T Series silicone is an industrial product and must not be used in food molding, dental and human skin molding applications.

Our Advantages

• We can be your reliable one-stop supplier of liquid silicone rubber, we focus on a wide range of silicone rubber such as HCR ,LSR ,RTV-2 ,HTV and other silicone products like electrical silicone potting,silicone gel,silicone oil,silicone gum,etc.
• We can be a strong backing for you to provide materials, our silicon rubber yield is 500 tons/month at least.
• We promise that the quality of our silicone rubber is as good as we describe,only use Dow sil,Wacker,Shin-Etsu,BlueStar and other well-known brands as our source of raw materials.
• We can provide silicone rubber at a more competitive pricing, which can make you to earn more profits.
• We have our silicone rubber certificates approved, such as FDA, MSDS, REACH, RoHS, etc.
• We have our professional freight forwarders, they will surely free you from troublesome shipping stuffs.
• We support to do transaction with you on Alibaba,a large-scale official international trade platform in where The rights of suppliers and buyers can be guaranteed safely.
• We can provide you with free sample for testing, which can relieve your worries before you volume order.
• We support to do any custom service for you,no matter the parameter of silicone rubber,colour,logo and even packages.

Company Profile
    Dongguan Gangtian Polymer Materials Co.,Ltd, located in Dongguan City, Guangdong Province, China, is a professional leading manufacturer of RTV 2 Liquid Silicone Rubbers.
    Focusing our Research and Development on innovation, we have been providing performance enhancing solutions to serve the diverse needs of thousands of customers worldwide since the year of 2003.
    Our main products include RTV 2 mold making series, tinsil and platsil, RTV 2 platsil for products, injection LSR, silicone potting compound, silicone oil, silicone ink, etc.
    With penetrating Professionalism in technology solutions and Honesty in after service, we GT Polymer Materials Co., Ltd are not only a trustworthy partner but also a good friend to the customers worldwide. Brand Story - Gangtian, founded in 2003 in Dongguan, by Yuanfu Deng, a Chinese chemist and engineer in the field of polymer materials, is a silicone factory brand. "Gang", or port, is a new place near sea for him to cultivate. "Tian", or field, stands for his hometown, a very small village in Hengyang, Hunan Province. Influenced by his parents who were both farmers, he creatively combines the company culture with Eastern wisdom, to work on the vision of "Making a better life with magic silicone rubber". With his efforts and achievements in R & D of silicone rubbers, we have been serving hundreds of domestic and overseas customers with quality materials for more than 15yrs. And now our production capacity reaches to more than 500tons per month.
    We uphold the core values of "create value for partners" and create value for e-commerce and information service industry through independent innovation and sincere co-op with "honesty, tolerance, innovation and service" as the spirit of enterprise. We always warmly welcome you to join us. Let's go and explore this magic world of silicones!



FAQ
1. Are you the direct manufacturer of silicone rubbers?
Yes, we are.
Our company is located in Donguan City, Guangdong, CN.
Welcome to visit us!
 
2. Is a free sample available?
Yes. Normally we can offer dear you 500g sample in free of charge.
 
3. Are you a very young company?
Emmm, GT is 16yrs old now. So yes, we are very young and we have a very long way
to go!
 
4. What's your delivery time like?
3-5 working days after confirming your payment in our bank.
Warm Tips: 1 working day is for our technician to test the cargo and arrange the COA.



Common Question and Our warm advice and solutions.

Why could the silicone mold be reused only for a few times?
Maybe you will confuse about this question for years. Here we share you some following reasons:
*  Adding too much silicone oil into silicone rubber. Silicone oil is an additive which will destroy the molecular weight of silicone rubber and reduce the tension and tear strength.
*  Adding too much catalyst into the silicone rubber when you make the molds. For the condensation cure(tin catalyst) silicone rubber. we s est you add no more than 2% of catalyst. If you 1add too much catalyst, the operation time will be too fast to operate ,which will also reduce the tension and tear strength.
*  Using the silicon rubber with a high hardness to make molds for small sized products with delicate and intricate designs and the silicon rubber with a low hardness to makes molds for large sized products with simple designs.


Why does the silicone mold get burnt out?
The silicone mold get burnt out 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.
Our silicone rubber has add a special material which can resistant high temperature to make the resin molds. Help our customer avoid this problem. 


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 silicon rubber, we will dry out the water in the silicon rubber.
Solution: Add 0.05% water into the silicon rubber and Stir over a low speed briefly when you use it.


Why is the tear strength of silicone molds weak?

There are three reasons:

First: In order to reduce the viscosity of silicone rubber and pursue good quality, a large amount of silicone oil can be added to the silicone rubber when making the mold. In fact, it may have the opposite effect. The addition of silicone oil can severely reduce tension and tear strength. And the silicon mold will be in a fragile and fragile state.

Secondly: too much catalyst may be added to the silicone rubber, we recommend that customers add catalyst no more than 5%, 2% is fine.

Third: After the silicone mold is finished, you may use it prematurely. We recommend that customers start using the mold after 24 hours. More importantly, it would be better if you could make an outer mold to protect the silicone mold.



5. Why does the mold silicone have poor tension?

In the process of making the mold, in order to reduce the viscosity of the silicone rubber and make the silicone rubber easy to operate, a large amount of silicone oil is added to the silicone rubber, which will make the silicone rubber very soft, resulting in poor tensile strength and reduced tear strength. The phenomenon of poor tensile force, resulting in the phenomenon that the mold is not durable, the service life is short, and the number of mold overturns is small.


6. Why does the mold appear oily?

The mold silicone itself will not emit oil. The oil is caused by the addition of composite silicone oil (complex of silicone oil and white mineral oil) during the operation, because white mineral oil is a petrochemical product, not silicone oil.


8. Why does the  silicone mold have traces, streaks, and unevenness on the surface?

This phenomenon occurs because the product or model to be reproduced has not been ground or polished. Because the actual model or product itself is not smooth or perfect enough, if the product or model to be copied has not been ground or polished, even the best silicone mold will be unsightly and not smooth enough. Another situation is that when the release agent is applied, the mold will not be smooth if it is not evenly brushed.

9. What else wonderful usages of mold silicone do you know?

Mold silicone rubber is mainly used in toy and gift industry, craft gift industry, furniture decoration industry, character reproduction, building decoration and decoration industry, resin handicraft industry, unsaturated resin handicraft industry, candle craft, plastic toy industry, gift stationery industry, gypsum Craft gift industry, mold manufacturing industry, glass industrial products, simulation animal and plant sculpture, Buddha carving crafts and other industries product replication and mold making.