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Filter by Brand: SMOOTH-ON
Silicone Mold Making Rubber

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Silicone Mold Making Rubber

by Smooth-On

Use these silicone mold making rubbers for making perfect reproductions of original models. They capture intricate detail and are easy to use. OOMOO 30 and OOMOO 25 are easy to use silicone rubber compounds that feature convenient one-to-one by volume mix ratios (no scale necessary). Very low viscosity for easy mixing and pouring, and vacuum degassing is not necessary. Cures at room temperature with negligible shrinkage. OOMOO 30 has a 30-minute pot life, with a six-hour cure time. OOMOO 25 has a 15-minute pot life with a 75 minute cure time. For The Novice Mold Maker - OOMOO 30 and OOMOO 25 do not have great tear strength. They are good for making simple one- or two-piece block molds. OOMOO 30 and OOMOO 25 are suitable for a variety of art-related and industrial applications including making molds for sculpture and prototype reproduction, casting plaster, resins, and wax. Net weight 2.9 lbs.

Technical Information for OOMOO 30
Mixing Ratio: One to One by volume (100A:130B by weight)
Pot Life: 30 min.
Demold: 6 hrs.
Color: Lavender

Properties (Part Aand B Mixed)
Viscosity: 4,250 cps
G/CC: 1.34
Cu. In./Lb.: 20.6
Tensile Strength: 240 PSI
Elongation At Break: 250%
Die C Tear Strength: 40 pli
Compression Set: 37%
Shrinkage: .0025 in./in.

Technical Information for OOMOO 25
Mixing Ratio: One to One by volume (100A:130B by weight)
Pot Life: 15 min.
Demold: 75 min.
Color: Light Blue

Properties (Part A and B Mixed)
Viscosity: 4,250 cps
G/CC: 1.34
Cu. In./Lb.: 20.6
Tensile Strength: 240 PSI
Elongation At Break: 250%
Die C Tear Strength: 40 pli
Compression Set: 37%
Shrinkage: .0025 in./in.

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Average User Rating: Based on (14 Reviews)

deville composites from san diego says:

This is good stuff; however, it is only good for a few pulls and tear strength is very low.

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Customer Product Reviews

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Rated by: deville composites in san diego

This is good stuff; however, it is only good for a few pulls and tear strength is very low.

Rated by: CeeCreations in Rockport, TX

Have used this in our custom figure business since 2005.The molds are still great after being used numerous times throughout the years, as long as you store them properly, no extreme heat or cold. Easy to use..easy cleanup. One problem-its shelf life is only a few months and then it gets lumpy.

Rated by: Ian A. in Oneonta, NY

I use this product in casting masks that I carve and I could not ask for anything better. It is easy to use and mix, and yields great results and details. A word of caution though, Be wary of humid days, as I experienced bubbles in the casting (which I had never happened before) which I had not had happen before. Also, make sure you keep the mold clean, I experienced a little sticking when casting with plastic, which was stuck hard and ruined the mold. THIS DOES NOT MEAN THIS IS AN INFERIOR PRODUCT! I am merely mentioning this because I have experienced it under certain conditions and I don't want anyone to waste more silicone than they have to.

Rated by: Beltonbanger in Temple,Tx

I'm a taxidermist and use it for making fish and bird heads. Great stuff!!! Love the set time and the firmness of the product!! Get you some!!!!

Rated by: Matt A. in Arlington, VA

Great stuff, it picks up the detail very well, I don't have a problem with air bubbles because they are in the mold and not the parts where the model is, so there aren't any bumps when I pour in the liquid plastic compound. Great product, keep it up, will order from you in the future!

Rated by: Barry G. in Marietta, GA

I really like the amount of detail that is picked up no matter how small. Compared to other similar rubbers it is a bit too thick for my taste making it more difficult and time consuming to mix. Another problem I have is the softness which is good and bad-good for box molds -bad for two piece or even one cut box molds(it won't stretch much without tearing). All in all though it is a good product I would recommend it for simple mold purposes.

Rated by: Chris E. in Rockport, TX

Product is amazing!!! Exactly as advertised and simple to use. However... be aware that in shipping contents can leak from bottles and the 1 to 1 ratio is no longer feasible. Trying to get the order replaced was unsuccessful.

Rated by: Garrett O. in Aliso Viejo, CA

If you are debating on getting OOMOO 25 or OOMOO 30, definitely get OOMOO 30! Its far more durable and easy to work with. Excellent product for making even complex 2 part molds. 1:1 mix ratio is the easiest I've ever used, and the rubber is fantastic. Highly recommended.

Rated by: Cheryl W. in Brookfield, WI

This silocone rubber has exceeded my expectations for making durable, precise molds. I'm amazed at how perfectly it reproduces the tiniest of details. It's a little pricey, but does make excellent molds. I wish it came in the larger gallon size as one of these "starter kits" will only get me through one project. As always, MisterArt.com service and delivery is first-rate.

Rated by: Jerry Z. in paradise, CA

I have bought this the oomoo 30 and it just gets the detail done very well. It is easy to use and you can make a mold of anything simple a + b mix of equal amounts. Tear strength is okay so just ensure your mold has enough rubber to stay together well. I try to cut corners and get the most out of the product and have pushed the mold to the limit great stuff

Rated by: Z K. in Eastern Side of, TN

I love Oomoo, I love Oomoo, I love Oomoo! Ok, seriously, this is much better than the Oomoo 25 I've been using as it has a much longer pot life, and it does cure harder also. This RTV is perfect for my mold making! :D If you have any interest in making your own molds, for candles, resin, jewelry, sculpture, anything, try it, you so won't be dissapointed!

Rated by: Tamara R. in Chesapeake, VA

Phenomenally easy to use!! The one to one mixture was very easy to get; no guessing. And it made a surprisingly strong silicone. Great product! GREAT price!

Rated by: Tawnya P. in Memphis, TN

This is the best mold maker I have found by far! I have ordered multiple times & I am NEVER let down! This will get the smallest of details down to the letter & my kids (4 of them) love to use this for projects as well! So very easy to use!

Rated by: Yev B. in Wilmette, IL

one of the most detailed making mold i had ever dealt in my life A+++++++++

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