Food Safe Soft Platinum Cured Liquid Silicone Rubber for Molds

food grade odor free non toxic 10-15 A platinum-catalyst heat resistance

Lead Time

Quantity(kilograms)	1-1000	1000-5000	≥5000
Est. Time(days)	2-3	4-7	To Be Negotiated

Contact for Detailed Quotation
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+86-158 9975 3674

+86-158 9975 3674
+86-158 9975 3674
TDS File

1. Description

This series of addition-cure (platinum-catalyzed) silicone is a low-hardness, low-viscosity, and soft silicone rubber material. Both Part A and Part B are translucent viscous liquids that can achieve an infinite variety of colors by adding silicone pigments. After mixing the two parts in a 1A:1B weight or volume ratio, curing can be completed at room temperature within several hours or accelerated by heating.

After curing, this series of silicone rubber materials are heat-resistant, non-toxic, and odorless. They have been tested and comply with FDA regulations for CFR 177.2600 extractable testing, making them safe for use in contact with food.

2. Feature

Easy 1:1 mix ratio.
Low viscosity, fantastic flow properties.
Low hardness, relatively soft.
Food grade, imparts no taste or odors.
Fine detail reproduction.
High heat resistance up to 250℃ (482°F), suitable for baking in an oven.

3. Application

This series of platinum-cured silicone rubber materials are highly regarded for their softness and ease of demolding. They are particularly suitable for making simple one-piece silicone molds used in soap, candle, food molds (such as baking molds, chocolates, candies, cakes), and more.

Mousse Cake Silicone Mold

Cake Decorating Lace Mold

Popsicle Silicone Mold

Candy Silicone Mold

4. Attention

Please use parts A and B of the same model and lot number. If different batches are used, suitability should be determined by testing.
For optimal results, mix and cure the material at 20-30°C (68-86°F) and 50% relative humidity. Addition-cured liquid silicone should not be used in humid conditions, as this may cause defective curing.
Lower temperatures and humidity will increase the working time of the material. Do not use platinum-cured silicone at temperatures below 15°C (60℉), as it may not cure properly or may be difficult to cure at all.
Platinum-cured liquid silicone needs to be used with care to avoid inhibition. Inhibition occurs when the platinum cure silicone doesn't fully cure due to contamination on the surface of the object being molded. Although it may appear to be fully cured on the surface, a tacky surface will be present after separation - this is called inhibition. Amines, tin compounds, sulfur-based clay, newly cast polyester, natural rubber such as latex and rubber gloves, PVC stabilizers, epoxy resin catalysts, UV curable resin, or urethane rubber may cause inhibition. If compatibility between the addition cure silicone and the surface is a concern, it is recommended to perform a small-scale test. Do not smoke during operation.

5. Safety

Under normal storage and handling conditions, these products are stable in airtight containers at room temperature and will not undergo any hazardous reactions.
Please keep out of reach of children.
First Aid Measures:
- Skin Contact: Wash the affected skin thoroughly with soap and water. Seek medical attention if symptoms persist after washing.
- Eye Contact: In the event of contact with the eyes, rinse them thoroughly with clean water for at least 15 minutes. Seek medical attention if irritation persists after rinsing.
- Inhalation: Under normal conditions of intended use, this material is not expected to be an inhalation hazard.
- Ingestion: Do not induce vomiting unless instructed by a physician. Rinse mouth thoroughly. Seek medical attention if symptoms occur.

Please note that these measures are general guidelines. In case of an emergency, always consult a medical professional or seek immediate medical attention.

6. Storage

When stored at room temperature (15 to 25°C / 60 to 77°F), the material has a shelf life of 24 months from the date of manufacture. Storing the material at higher temperatures may shorten the usable shelf life of unused materials. However, storing the product beyond the specified date on the certificate of analysis does not necessarily mean that the product is no longer usable.

Containers that have been opened must be carefully resealed to prevent leakage. Store in a cool, dry place with adequate ventilation and keep away from incompatible materials (such as bases and acids), open flames, and high temperatures.

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Parameter Item	Test Method	RTV-4100 A/B	RTV-4105 A/B	RTV-4110 A/B	RTV-4115 A/B
Unvulcanized Physical Properties @ 24 Hrs 25°C/77°F
Physical State	-	Liquid	Liquid	Liquid	Liquid
Form	-	Viscous	Viscous	Viscous	Viscous
Odor	-	Odorless	Odorless	Odorless	Odorless
Part A Color	ASTM E 1767	Translucent	Translucent	Translucent	Translucent
Part B Color	ASTM E 1767	Translucent	Translucent	Translucent	Translucent
Part A Viscosity, mPa.s	ASTM D 4287	5,000	5,500	6,000	7,000
Part B Viscosity, mPa.s	ASTM D 4287	4,500	5,000	5,500	6,000
Specific Gravity, g/cm³	ASTM D 792	1.03-1.05	1.03-1.05	1.03-1.05	1.03-1.05
Part A and Part B mixed @ 25°C/77°F
Mix Ratio by Weight or Volume (A:B)	-	1:1	1:1	1:1	1:1
Working Time, Minutes	-	40	40	40	40
Curing Time, Hours	-	4	4	4	5
Typical Properties of Cured Rubber @ 24 Hrs 25°C/77°F
Hardness, Shore A Durometer	ASTM D 2240	0	5	10	15
Tear Strength, N/mm	ASTM D 624 C	3.0	12.0	13.0	15.0
Tensile Strength, Mpa	ASTM D 412	1.8	2.5	3.0	3.4
Elongation, %	ASTM D 412	550	550	500	450
Shrinkage, %	-	≤0.20	≤0.15	≤0.15	≤0.10
Heat Resistance, °C (°F)	-	250 (482)	250 (482)	250 (482)	250 (482)

Step 1: Model Preparation

The master pattern should be thoroughly cleaned and dried. If the master model is fragile, weak, or porous, it may be necessary to apply a consolidant or sealant, and possibly fill in deep holes or crevices.

Step 2: Applying Release Agent

This series of silicones is highly regarded for its exceptional demolding performance, making the use of a demolding agent unnecessary for most materials. However, in cases where the master pattern exhibits high porosity, a rough texture, numerous cracks and undercuts, or is difficult to demold, it is advisable to apply a thin layer of demolding agent. This not only facilitates the demolding process by reducing friction and adhesion but also helps to extend the lifespan of the mold.

Commonly used demolding agents include acrylic spray, Vaseline, silicone oil, and soapy water, among others. These agents provide effective release properties, allowing for easier removal of the molded object from the mold.

Step 3: Measuring & Mixing

Mix the desired amount of Parts A and B in a 1:1 (by volume or weight) ratio and thoroughly mix them together. Accurate measurement is essential to achieve the best physical properties of the cured rubber. If you wish to add color to the silicone material, incorporate the desired colorant into the mixture. Mix the colorant thoroughly to achieve a uniform color throughout the material.

Step 4: Vacuum Degassing

You can assess the need for vacuum degassing based on the specific requirements of each project, but it is still recommended for achieving a flawless finish. If using vacuum degassing, place the mixed silicone in a container that is 3-4 times larger than the volume of the liquid silicone and vacuum degas until the silicone rises and then collapses. Continue vacuum degassing for an additional 1 to 2 minutes.

Techniques to Reduce Air Bubbles:

Hold the silicone container high above the master pattern and allow it to flow down slowly in a thin stream. This helps to break up any air bubbles as the silicone flows.
Temporarily incline the master pattern at an angle and pour the liquid silicone onto the higher end, allowing it to flow down over the rest of the pattern. Once the silicone reaches the lower end, lay the pattern flat and/or tilt or rotate it as necessary to achieve even coverage.

These techniques can be used alone or in combination with each other. Additionally, reducing the temperature and decreasing the ratio of curing agent can extend the working time and help to reduce air bubbles.

Step 5: Pouring Silicone

Pour the liquid silicone as soon as possible after mixing or vacuuming to achieve the best flow and air bubble release. The liquid silicone material should be poured at a depth of at least 0.5 cm above the highest point of the model surface. If the layer is too thin, the mold can tear easily.

Step 6: Demolding the Mold

Under normal circumstances, platinum-cure silicone rubber cures within the specified demold time at room temperature (25℃/77°F). Higher temperatures will result in shorter curing times, while lower temperatures may require more time for curing to complete.

After the specified curing time has elapsed, the outer surface of the mold should feel hard and dry. If the mold's hardness does not change after a period of time, it is usually safe to remove or demolded.

How long does it take for your platinum-cured silicone to cure if the temperature rises?
Platinum-cured silicone rubber's curing rate can be controlled by adjusting the temperature, but it cannot be controlled by changing the mixing ratio. Therefore, raising or lowering the temperature will either shorten or lengthen the working time and curing time. As a rule of thumb, a temperature change of approximately 10°C can halve or double the working time and curing speed.

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Does this silicone need to be degassed with a vacuum pump?
Generally speaking, for liquid silicone with a mixing viscosity below 8,000 CPS, allowing it to rest for 20-30 minutes will cause bubbles to naturally rise to the surface and burst. However, for materials with a viscosity higher than 8,000 CPS, they will not deaerate on their own. It is recommended to use a vacuum pump for deaeration.

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Can this mold capture small and intricate details effectively?
This mold is suitable for casting small and intricate details. This is a soft silicone material that captures fine details.

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I am planning to use your rtv liquid silicone to cast a delicate piece with some undercuts. I need a mold that is soft and stretchy enough to casting the piece without breaking it. How soft is your liquid silicone when it cures?
You can choose low-hardness silicone, such as RTV-4105 and RTV-4110, which is very soft and super easy to demold.

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How to eliminate the micro-bubbles produced by liquid silicone when stirring?
Liquid silicone with a viscosity below 10,000cps typically does not form bubbles when cured at room temperature. Bubbles are more likely to occur at high temperatures, as lower temperatures slow the curing process and reduce bubbles. If you want to eliminate all microfoam, you can mix Part A and Part B, put them in the refrigerator for 1 hour, and then continue curing at room temperature. However, please ensure that you seal the silicone before placing it in the freezer as water can affect the curing process of silicone. If possible, using a vacuum pump to remove bubbles is the most effective method.

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What is the softest two-part silicone that you offer? I am looking to make shoe orthotics out of it, and I am looking for extremely soft silicone.
We have 0 shore A and 00-30A very soft super elastic platinum cured silicone.

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Once the mold has been made, is it possible to use it in the kitchen at a temperature of 180°C?
Yes, platinum-cured silicone can be used up to 200°C.

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Will liquid silicone stay nice and soft after it cures?
Yes, it is soft enough. It is of good quality and does not tear easily. It can be easily unmolded and has good mechanical resistance. I have used it a few times to make resin molds with great results. It is also great for undercuts.

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Can it be used to make food silicone moulds?
Yes, platinum-cured silicone is non-toxic and odorless, and has passed FDA certification, which is food-grade silicone, so it can be used in the production of food molds.

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What is the actual shelf life of a product after opening?
Our experiments have shown that if you put the lid on after each use, store the bottle in a cool, dark place, and keep the temperature below 40°C, platinum-cured silicone will remain usable for up to 2 years. Our real-world data is based on rigorous testing in our own warehouse where we keep samples from each batch for the same duration to ensure consistency and reliability.

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