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99% positive over last 12 months
97% positive over last 12 months
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Mold Star 30-1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit
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Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Purchase options and add-ons
- Mold Star silicones cure to soft, strong rubbers which are tear resistant and exhibit very low long term shrinkage
- Molds made with Mold Star will last a long time in your mold library and are good for casting wax, gypsum, resins, and other materials
- Easy to use platinum silicone mold mix
- Cures to a soft, stong, tear resistant rubber
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Product Description
Mold Star Series - Easy to Use Silicone Mold Rubber
Mold Star silicones cure to soft, strong rubbers which are tear resistant and exhibit very low long term shrinkage. Molds made with Mold Star will last a long time in your mold library and are good for casting wax, gypsum, resins, and other materials. Cured Mold Star rubber is heat resistant up to 450°F (232°C) and is suitable for casting low-temperature melt metal alloys.
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One to One Mix RatioMold Star rubbers are mixed 1A:1B by volume (no weighing scale necessary) for precise measurements even at a very low mass and cure at room temperature with negligible shrinkage. |
No Vacuum DegassingMold Star silicones feature relatively low viscosities making vacuum degassing optional and is not required for most applications. A uniform flow will help minimize entrapped air. |
Mold Star Translucent Series14T, 19T, 20T, and 31T fast curing silicones for making molds or casting into alginate molds. They offer an infinite number of color effects achieved by adding Silc Pig silicone pigments or Cast Magic effects powders. |
Make Molds FastMold Star 16 is available in a 400ml cartridge and is one of the fastest ways to make a silicone mold. With a 6 minute pot life and 30 minute cure time It can even be used in forensics to capture evidence impressions in the field. |
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Mold Star 30 - How It Works
Smooth-On, Inc.
Product information
Product Dimensions | 7.52 x 5.98 x 2.99 inches |
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Item Weight | 1.13 ounces |
Manufacturer | Smooth-On, Inc. |
ASIN | B00ETAY8RI |
Item model number | COMINHKR067156 |
Customer Reviews |
4.5 out of 5 stars |
Best Sellers Rank | #12,510 in Arts, Crafts & Sewing (See Top 100 in Arts, Crafts & Sewing) #120 in Sculpture Molding & Casting Products |
Is Discontinued By Manufacturer | No |
Date First Available | September 11, 2013 |
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the quality, performance, and ease of use of the silicone mold making kit. They mention that it's a solid product, works well, and is easy to use. Customers also like the mix ratio, and detail. However, some customers have reported that the kit is overpriced for only a small batch and that the material is not enough for any normal-sized project.
AI-generated from the text of customer reviews
Customers like the quality of the product. They say it's a great product, it makes good molds, and it'll hold up over the years. Some say that the molds are rock hard and easy to mix and cast.
"...This stuff is high quality and having a few pints actually is a good thing too, so you'll actually use it...." Read more
"...It is pliable enough to get my cement object but it is tough enough that I expect it is going to continue to last a long time...." Read more
"Excellent detail. Easy to work with. Mold Star 30 seems the right mix of strong and very flexible...." Read more
"Seems easy enough to mix and cast, sets up nice and firm. But wont cure against sla resin prints." Read more
Customers like the performance of the silicone. They say it works well for small projects, is good in use, and has no problem making molds. Some say that the silicone has been pliable enough to remove it with some force, while still being strong and flexible. Overall, most are satisfied with the performance and quality of the product.
"...The silicone has been pliable enough to remove it with some force, while still snapping back to its original shape...." Read more
"...The mould has been perfect. It is pliable enough to get my cement object but it is tough enough that I expect it is going to continue to last a long..." Read more
"...Easy to work with. Mold Star 30 seems the right mix of strong and very flexible...." Read more
"...The 5 times I have purchased this trial unit, it never fails, IF you are patient and know how to use the product as indicated...." Read more
Customers find the product easy to use. They mention that it's a great product for beginners and that the molds are 30 is not one of their greatest.
"...Overall, this is easy to use but the learning curve mainly hinges on how well you plan your design and your mold boxes...." Read more
"It's easy to use product but molds are 30 is not one of their greatest releases. Spend a little more money and get a mold that will hold up better" Read more
"Excellent detail. Easy to work with. Mold Star 30 seems the right mix of strong and very flexible...." Read more
"...It is NOT difficult work with this product if you follow instructions...." Read more
Customers like the mix ratio of the product. They mention that it's easy to mix, and it'll work well if mixed properly.
"...What drew me to using Mold Star 30 is not only it's easy mix ratio of 1:1 by volume..." Read more
"Seems easy enough to mix and cast, sets up nice and firm. But wont cure against sla resin prints." Read more
"...Super easy two part mixing.It is very strong and does not deteriorate over time with the chemical harshness of resin...." Read more
"Great if you mix properly..." Read more
Customers appreciate the detail of the product. They say it has excellent detail and is easy to work with.
"Excellent detail. Easy to work with. Mold Star 30 seems the right mix of strong and very flexible...." Read more
"Easy to use and great details!" Read more
"Fine detail..." Read more
Customers are dissatisfied with the value of the product. They mention that it is overpriced for only a small batch, and the product is definitely not cheap. They also mention that their money was wasted.
"...Because it tends to be expensive, I have been experimenting with making moulds from silicone caulk. You get what you pay for...." Read more
"...So there was a wasted amount that I couldn't use, which isnt great...." Read more
"...Not very happy because I can't return and the product is definitely not cheap. DO NOT BUY FROM THIS SELLER." Read more
"for small projects this works well but expensive to buy trials if you have larger projects...." Read more
Customers are dissatisfied with the material. They mention that it's not enough for any normal-sized project, the fluid/volume the mix fills is not enough, and the bottle was not full. They also say that the material isn't good quality and it'll waste their money.
"It was not enough material and I had to buy another kit. It is for small projects" Read more
"First of all, there’s barely enough to do one small mold and for 40$?!..." Read more
"...Waste of my money. Didnt get half of what the reviews said. Bottles werent even full. Wont buy again" Read more
"...product mention how much fluid/volume the mix fills, not enough for any normal-sized project. Waste of my money." Read more
Customers are dissatisfied with the durability of the product. They mention that the mold starts to break down after about 20 castings, resulting in the loss of the mold and breaking their master piece.
"...This made it hard to mix and my mold didn't come out right." Read more
"...almost IMPOSSIBLE to demold, had to cut it out resulting in the loss of the mold and breaking my master piece.COMPLETELY DISAPPOINTED!" Read more
"Solid product, but I found that the mold started to break down faster than the Mold Star 15 Slow product...." Read more
Reviews with images
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Top reviews
Top reviews from the United States
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When you get these, stir each jar VIGOROUSLY with SEPARATE mixing sticks (I used a silicone stir stick or a drill with a mixing paddle, just drill slowly)! Not using separate sticks will cause cross contamination and you'll ruin the material. I also love the colours which helps with knowing when it's mixed, you don't want streaks in it.
Now, prepping your part for molding takes some planning on your part and having sulfur free plastilina clay is HIGHLY RECOMMENDED and IMPORTANT, especially on wood mold boxes. Once the two parts are mixed in a cup you have 45 minutes to pour it into the mold. And I like that because I'm not rushing to pour and 45 minutes is PLENTY of time to stir the material and ensure a proper mix. In that time, you check your dry mold, fix a few things, and even take time degassing the silicone (the vacuum pot is optional).
After pouring, you'll have to wait 6 hours until it cures. I ended up sitting the mold outside overnight to cure and doing this on a hot summer night helps immensely, especially when using the cups to check on curing. It was 97°F when I poured the silicone and the leftover material was already fully cured 3 hours later! Wow.
The only knock I have on this product is the pricing for a pint and the price kept fluctuating here on Amazon, but you get what you pay for. This stuff is high quality and having a few pints actually is a good thing too, so you'll actually use it.
Overall, this is easy to use but the learning curve mainly hinges on how well you plan your design and your mold boxes. Also, doing this outdoors helps with odors depending on what region you're in, especially where the air is drier. Once the price falls back to normal, I'll be getting more of these.
ADDENDUM: My masters are done in PLA. For those of you who are using resin printed models, make sure the resin is COMPLETELY UV CURED before using this.
Reviewed in the United States on June 26, 2022
When you get these, stir each jar VIGOROUSLY with SEPARATE mixing sticks (I used a silicone stir stick or a drill with a mixing paddle, just drill slowly)! Not using separate sticks will cause cross contamination and you'll ruin the material. I also love the colours which helps with knowing when it's mixed, you don't want streaks in it.
Now, prepping your part for molding takes some planning on your part and having sulfur free plastilina clay is HIGHLY RECOMMENDED and IMPORTANT, especially on wood mold boxes. Once the two parts are mixed in a cup you have 45 minutes to pour it into the mold. And I like that because I'm not rushing to pour and 45 minutes is PLENTY of time to stir the material and ensure a proper mix. In that time, you check your dry mold, fix a few things, and even take time degassing the silicone (the vacuum pot is optional).
After pouring, you'll have to wait 6 hours until it cures. I ended up sitting the mold outside overnight to cure and doing this on a hot summer night helps immensely, especially when using the cups to check on curing. It was 97°F when I poured the silicone and the leftover material was already fully cured 3 hours later! Wow.
The only knock I have on this product is the pricing for a pint and the price kept fluctuating here on Amazon, but you get what you pay for. This stuff is high quality and having a few pints actually is a good thing too, so you'll actually use it.
Overall, this is easy to use but the learning curve mainly hinges on how well you plan your design and your mold boxes. Also, doing this outdoors helps with odors depending on what region you're in, especially where the air is drier. Once the price falls back to normal, I'll be getting more of these.
ADDENDUM: My masters are done in PLA. For those of you who are using resin printed models, make sure the resin is COMPLETELY UV CURED before using this.
The finished silicone produces a semi-hard but pliable rubber. I'd compare it to the rubber that condensation-catching mats are made from, the kind that line a bartop (can't think of a better name for them), maybe just a little harder than those though. I made a few molds for concrete out of this, and while they weren't the most intricate there were still some angles in the one-part molds that I was worried could wear or break when pulling the concrete out. The silicone has been pliable enough to remove it with some force, while still snapping back to its original shape. I'm sure on a microscopic level, all the pulling will wear it out faster, but I couldn't see anything from looking closely.
If you're making a mold of something that has a few turns or twists, or strange angles, I'd recommend a two-part mold.
It will also grab detail from whatever you're making the mold from, which is both good, and also something to keep in mind as any imperfections left of the surface of your positive will also be on any reproductions made from the mold.
Because it tends to be expensive, I have been experimenting with making moulds from silicone caulk. You get what you pay for. It was much cheaper to do it with the caulking, but what a pain!
I will be purchasing the bigger buckets of Mold Star 30 as soon as I can.
My initial and ongoing molds have been a success. I have made custom molds for customers and they have been 100% content and satisfied.
Top reviews from other countries
NB: Make sure your structure has no leak otherwise the liquid rubber will seek through.
I realized after two molds, that my cure time was longer because my house was a little cold. But really. It ended up with no air bubbles in it even!! I'm in love.