MC silicone: 2015

Sunday, December 6, 2015

MC silicone/Transparent Silicone Rubber Sheet for Baluster Mold Casting/Similar as WACKER ELASTOSIL LR 3040

MC silicone/Transparent Silicone Rubber Sheet for Baluster Mold Casting

Description of Transparent Silicone Rubber Sheet

MC Silicone addition cure molding silicone rubber is a two component elastomer cross-linking at room temperature. The polymerization can be accelerated by heat. The silicone components are delivered as liquids, which once mixed and cured transform into a transparent, elastic and resistant material. Polymerization occurs without formation of heat.

Features of Transparent Silicone Rubber Sheet

High Transparency
High tear and tensile strength
Long shelf life with low shrinkage
Easy mixing

Applications of Transparent Silicone Rubber Sheet

Label manufacturing, Molding applications requiring low shrinkage e. G. Toys, jewelry, automotive, rapid prototyping etc.

Typical properties of Transparent Silicone Rubber Sheet

Item no.	RTV1040
Color	Transparent
Viscosity	65000 cps
Mix ratio	100:10
Pot life	60 mins
Curing time	12-24 hrs
Hardness	40 shore A
Tensile strength	5 Mpa
Elongation	350%
Tear Strength	27 N/mm
Shrinkage	0.1%

How to use of Transparent Silicone Rubber Sheet?

1-Take 100g of part A and add 2g of part B and mix the silicone rubber and curing agent evenly.

2-vacuum pumping
Without exception, this step takes less than 10 minutes. Otherwise, it will cause , and no more further steps will be available

3-Pouring mold or block mold of silicone rubber
The pouring way is an easy way to make molds, it's slowly and evenly pour into the mixed silicon rubber into the square frame. After the cross linking reaction.

Storage of Transparent Silicone Rubber Sheet

When the silicone rubber is stored at or below 30 centi degree in the original unopened containers, Silicone Base and Curing agent have a usable life of 10 months from the date of production. After 10 months stockpiles use the Stir to mix the Part A silicone for some minutes, then the silicone can be use again, no influence for other performance.

Packaging of Transparent Silicone Rubber Sheet

Part A base silicone: 5kg, 20kg/drum, 25kg/drum or 200kg/drum
Part B CA30 Curing Agent: 250g, 800g/bottle, 1kg/bottle

Order infomation

MOQ: 200KG
Trade term: EXW, FOB, CIF
Delivery time:ONLY ONE DAY FOR SAMPLE CALL, 5-20 Working Days for Mass Order

Thursday, December 3, 2015

How to deal with silicone mold difficult demould?

There are many influencing factor for silicone mold difficult demould. In the first place, the surface of silicone mold selected as model is needed to be processed, particularly for those mold species with rough surface or complex structure, which can be polished, grinded and cleaned. Coarse model is more likely to occur this phenomenon of mucous membrane than smooth silicone mold.

Next, please don't forget to spray a layer of release agent on the surface of silicone mold and the base uniformly. The release agent most commonly used is petrolatum, detergent and liquid paraffin. You ought to select different release agent on the basis of material of silicone mold during the practical operation. It is unwise of many people to increase the usage of demoulding agent and using frequency to overcome the problem of silicone mold difficult demould. Excessive spraying release agents are likely to cause the dirt of silicone mold's surface, ranging from some impact on the appearance of the product. Most of the release agent has certain influence on the product of subsequent screen printing and fuel injection, excessive use of release agent will also affect the adhesion ability of screen printing, spraying, and printing ink. Therefore, we also need to solve the silicone mold difficult demould by following several ways.

On the third point, the difficult demould is closely related to the structure of silicone mold. Such problem of silicone mold difficult demould does not apply to those products which is sutable for wrapping operation, such as making simple crafts. But for those products of complex structure, such as tire mold, you should take the parting time into consideration. The tire silicone mold is made, which is divided into six pieces.

Besides, you should think over this factor of hardness of silicone rubber, which must be consistent to the size of the products. The soft silicone can be applicable to those small size products with detailed patterns to deal with the phenomeon of silicone mold difficult demould. Of course, it has a knack of adjustment of the operating temperature. Products like stuck in this half of silicone mold with lower temperature. For example, when the temperature of the upper silicone mold is 175 ℃ and the lower silicone mold is 165 ℃, the products generally are stuck in the lower silicone mold.

Why silicone mold appears bleeding oil?

This phenomenon of silicone mold appears bleeding oil may mainly relate to adding too much silicone oil or having mixed the compound silicone oil which is the compound of silicone oil and white oil in the process of making silicone mold. And the white oil is a kind of petrochemicals but not the pure silicone oil. This is a mean took by manufacturers in order to save costs of silicone mold because the price of pure silicone oil is much higher than the white mineral oil.

Here, we have to say about the difference between the pure silicone oil and un-graded silicone oil to produce the high quality silicone mold and avoid the problem of bleeding oil. Firstly, you can see with your eyes and smell with your nose directly, because the ungraded silicone oil is in a turbid liquid form and smells bad. Then, you can test it by fire. The burning point of ungraded silicone oil is 100℃, while the pure silicone oil is 320℃. Besides, you can also take the freezing point method, because the silicone oil will remain clear and transparent under temperature of -50℃.

Secondly, the reason why silicone mold appears bleeding oil may be that you add too much curing agent (catalyst) in the production of silicone mold. So, you should reduce the ratio of curing agent, otherwise, this silicone oil added in the silicone rubber is easy for bleeding oil.

Dow Corning Silastic 3481 Similar Silicone Rubber

More details please contact sophie via skpye:sophieszmc

Please scan QR code as below.

Dow Corning Silastic 3481 Similar Silicone Rubber

Item No.	RTV2024
Dow Corning Item	Silastic 3481
Appearance	White
Viscosity(cps) Part A	33000
Catalyst	Silastic 81
Mix ratio(by weight)	"100:5
Pot Life(mins)	90-120
Curing Time(hrs)	24
Hardness(shore A)	19-20
Tensile Strength(Mpa)	4.8
Tearing Strength(KN/M)	25
Elongation(%)	>633
Shrinkage(%)	0.20

Frequently asked questions about mold making Silicone Rubber

1. Is silicone suitable for making large-size mold, such as gypsum statue mold?

Yes. The silicone material seems so soft, which makes many people misunderstand that it can not be used for big objects. In fact, if you build a simple outer shell to protect the silicone mold from getting deformed.

2. What are the benefits that users can get from silicone mold making?

It is perfect to catch the fine details from the original mold. What’s more, it can be reused for many times. Addition cure type silicone rubber is completely harmless to human’s health so that it can be used for food molding process.

3. Before starting the molding process, what kind of work should be done first?

You should handle the original model first. For example, you should clean the surface of the original model by detergent, and then dry it with a clean cloth. After that you’d better evenly spray a layer of release agent on the surface for a successful demoulding in the later step.

How to classify the electronic potting silicone rubber?

Electronic potting silicone rubber has a various kinds, mainly including: heating-conducting potting silicone rubber, epoxy resin potting silicone rubber, organic silicone potting sealant, polyurethane potting silicone rubber and LED potting silicone rubber.

The characteristics of electronic potting silicone rubber:

Low viscosity, good leveling property, suitable for mold pressing for complicated electronic accessories.
Taking on soft silicone form with shock resistance.
Heat proofing, moisture proofing, cold proofing, able to elongate the life of electronic accessories after being used practically.
Being addition curing type, able to get cured at room temperature or at heated temperature.
Excellent moisture and water resistant effect.
　　　

The application of electronic potting silicone rubber.
Mainly applying to high-power streetlight’s power source, power source module, HID lamp power module, potting protection for solar-power junction box, LED electronic display, LED electronic potting silicone rubber, potting and sealing for circuit board, adhesion for power line, LED or LCD high-power lamp, mobile phone, power source box, ultrathin computer, game machine, digital camera, airport runway, and so on.

Wednesday, December 2, 2015

Polyurethane price/Liquid Urethane Molds for concrete Balusters

Product Description

Polyurethane mold rubbers consist of a Part A and a Part B that, after mixing, cure at room temperature to flexible, high-strength rubbers. Polyurethane rubbers make durable, easy releasing molds for casting plasters and waxes without release agents, but, when used with proper release agents, are also excellent for casting concrete, epoxy, polyester, polyurethane and acrylic.

Polyurethane mold

Product Features

High strength
Low to moderate cost
Many versatile formulas

Product Applications

Casting most materials.
Acceptable for some resins.
Not acceptable for molten metals.

Datasheet for polyurethane Molding Rubber

Item No.	MCPU-50
Mix ratio	1.4 : 1
Part A color	Yellow
Part B color	Clear
Pour time (mins)	30
Demoud time (hrs)	7-8
Full cure (hrs)	24
Density (g/cm3)	1.05
Mixed viscosity (cps)	2000±300
Hardness (shore A)	50
Tensile strength (Mpa)	6.72
Elongation (%)	724
Shrinkage	N/A
Tear strength (N/mm)	50.22

Polyurethane Price

Storage & Shelf life

When the liquid polyurethane Rubber is stored at or below 30 C (85F) in the original unopened containers, polyurethane rubber Base and Curing agent have a usable life of 12 months from the date of production.

Packaging & Shipping

1. Packed with vacuumed thick PE bag inside, and iron barrel (tin) outside, packing in 20kg, 200kg.

2. The product should be stored in a cool dry place, avoid the sun and rain, it must be kept away from acids, alkalis, salts and other compound.

Packaging of silicone rubber