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  3. SMOOTH ON 10015781

SMOOTH-ON 10015781 Mold Star Slow Mix Volume Platinum Rubber 751635292611 Unit Inc. 1A 1B Silicone Gallon

10015781 Smooth-on Inc. Mold Star 15 Slow 1a 1b Mix By Volume Platinum Silicone Rubber Gallon Unit

( Brand: Smooth-on ), ( Manufacturer Part Number: 10015781 ), ( Part Type: Unit ), ( Color: Green ), ( Material: Metal, Rubber, Silicone ), ( Material Type Free: Latex Free ), ( Volume Capacity: 1 Gallon ), ( UPC: 751635292611 ), ( Package Dimensions: 16.61 X 8.74 X 8.39 Inches; 20.77 Pounds ), ( Item Weight: 20.7 Pounds )

Review SMOOTH ON Inc. Mold Star Slow 1a 1b Mix By Volume Platinum Silicone Rubber Gallon Unit

The **Smooth-On 10015781 Mold Star 15 Slow Platinum Silicone Rubber (1A/1B Mix, Gallon Unit)** is a high-performance, two-part platinum-cured silicone rubber formulation designed for artists, model makers, and professionals seeking unparalleled versatility in creating durable, flexible, and highly detailed molds and casts. This premium-grade material is part of Smooth-On s renowned Mold Star series, renowned for its exceptional tear resistance, low shrinkage, and superior dimensional stability, making it ideal for applications where precision and longevity are critical. With a slow cure rate, this silicone rubber allows for extended working time up to 45 minutes at room temperature enabling artists to meticulously position and adjust their molds before the material begins to set, reducing the risk of errors and ensuring flawless replication. The 1A/1B mix system ensures consistent, repeatable results, as the precise ratio of base to catalyst is easily measured and combined, eliminating guesswork and guaranteeing optimal performance. This gallon unit (approximately 128 fluid ounces) provides ample volume for large-scale projects, from intricate sculptural molds to industrial prototypes, without the need for frequent reordering. The platinum-cure technology delivers a final product with remarkable flexibility, resistance to environmental degradation, and a smooth, glossy finish that enhances the aesthetic quality of the resulting casts. Whether used for creating molds for jewelry, automotive parts, architectural models, or specialized industrial applications, this silicone rubber excels in durability, offering a service life of up to 10,000 cycles of use, making it a cost-effective and reliable choice for both hobbyists and commercial users. Its non-toxic, low-odor formulation also ensures a safer working environment, adhering to stringent industry standards for safety and compliance. Ideal for those who demand excellence in their craft, the **Mold Star 15 Slow Platinum Silicone Rubber** is a cornerstone material for achieving professional-grade results with ease and confidence.

**Pros and Cons of buying a Smooth-On 10015781 Mold Star 15 (Slow) Platinum Silicone Rubber (1-Gallon Unit)**

### **Pros**

1. **High Durability and Longevity** Platinum silicone rubber is known for its excellent resistance to heat, cold, and environmental factors, making it ideal for long-term use in molds, prototypes, and industrial applications.

2. **Slow Cure Time** The "Slow" designation means the material takes longer to cure (approximately 24 hours at room temperature), which allows for easier mixing, pouring, and adjustments before final setting. This is beneficial for complex or large-scale projects where precision is critical.

3. **Versatile Applications** Suitable for a wide range of uses, including:

- **Art and Sculpture** Ideal for creating detailed molds for casting resins, wax, or other materials.

- **Prototyping** Useful in industrial design for making reusable molds for testing new products.

- **Medical and Dental** Can be used for custom dental impressions or medical device molds due to its biocompatibility (though always verify specific applications).

- **Food-Grade Options** While this specific mix is not food-safe, Smooth-On offers food-grade alternatives if that is a requirement.

4. **Reusable Mold Material** Unlike some disposable casting materials, Platinum silicone rubber can be reused multiple times, making it cost-effective for repeated projects.

5. **Good Tear Resistance** Once fully cured, the rubber maintains structural integrity under moderate stress, reducing the risk of tearing during use.

6. **Low Odor and Non-Toxic** Platinum silicone rubber has minimal odor compared to some other silicone formulations, making it more pleasant to work with in enclosed spaces.

7. **Compatibility with Release Agents** Works well with various release agents, ensuring easy demolding of cast parts.

8. **Industry Standard** Smooth-On is a trusted brand in the silicone industry, with a reputation for reliability and consistent performance.

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### **Cons**

1. **High Cost** The 1-gallon unit is a significant investment, especially for hobbyists or small-scale users. The price per ounce is higher than many disposable or lower-grade materials.

2. **Longer Work Time** While the slow cure is beneficial for adjustments, it also means you must plan your workflow carefully. Rushing the process can lead to incomplete curing or poor results.

3. **Requires Proper Mixing** The material must be mixed thoroughly to avoid inconsistencies. Improper mixing can result in weak spots or uneven curing.

4. **Not Food-Grade** This specific mix (Platinum silicone rubber) is not food-safe. If you need food-grade silicone, you must purchase a separate, designated product.

5. **Limited Shelf Life After Opening** Once opened, the material should be used within a reasonable timeframe (typically a few weeks) to prevent degradation. Unopened, it has a longer shelf life but is still best used within a few years.

6. **Specialized Tools Needed** Working with silicone rubber may require tools like mixing cups, stir sticks, and release agents, which add to the initial setup cost.

7. **Curing Time Delays** If you need quick turnaround, the slow cure time can be a drawback, as it may not be suitable for same-day projects.

8. **Potential for Voids or Bubbles** Improper degassing or mixing can introduce air bubbles, which may require additional steps (like vacuum degassing) to eliminate.

9. **Not Suitable for High-Temperature Applications Beyond Specifications** While durable, it has temperature limits (typically up to 450 F/232 C for some platinum silicones). Exceeding these limits can degrade the material.

10. **Learning Curve for Beginners** Working with silicone rubber requires understanding proper techniques for mixing, pouring, and curing to avoid common mistakes like poor adhesion or incomplete sets.

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### **Conclusion**

The **Smooth-On 10015781 Mold Star 15 Slow Platinum Silicone Rubber (1-Gallon Unit)** is a high-quality, professional-grade material best suited for users who need a **durable, reusable mold** for complex or large-scale projects. Its slow cure time provides flexibility, and its durability makes it ideal for repeated use in art, prototyping, or industrial applications. However, the **high cost, longer work time, and specialized requirements** may not justify its purchase for casual users or those working on small, one-off projects.

If you are a **professional artist, industrial designer, or someone who frequently creates molds**, this product is an excellent long-term investment. For **hobbyists or occasional users**, it may be overkill unless you are committed to working with silicone rubber regularly.

### **Recommendation**

- **Buy if:** You need a **reusable, high-quality mold** for professional or frequent use, and you can afford the upfront cost. The slow cure is beneficial if you require time to adjust your pours.

- **Avoid if:** You are a beginner, work on small or one-time projects, or need a **food-grade or fast-curing** alternative. Consider lower-cost disposable molds or faster-curing silicones (like the "Fast" version of Mold Star 15) for simpler needs.

- **Alternative Considerations:**

- For **budget-friendly options**, look at lower-cost silicone rubbers or disposable casting materials.

- For **faster curing**, opt for the "Fast" version of Mold Star 15 (10015782).

- For **food-grade use**, purchase Smooth-On s **Platinum Silicone Rubber Food Grade** separately.

- For **smaller projects**, a **1-pound or 5-pound unit** may be more practical than a gallon.

Ultimately, this product is best justified for **serious, long-term users** who prioritize durability and flexibility over cost.

Details:

Mold Star silicone's cure to soft, strong rubbers which are tear resistant and exhibit very low long term shrinkage. Mold Star silicone's feature relatively low viscosity's and vacuum degassing is not required for most applications. Keep Out of the Reach Children. Premium Platinum Silicone: Durable, tear-resistant rubber with low long-term shrinkage, perfect for casting various materials.

Supersizing Resow e Reimburse Chi Diamo. Chi Diamo?: Il nostril Negro ci tine Allah tau Esperanza, per Agni Tu Dubbo supremo a complete disposition. Mold Star 15 SLOW 1A 1B Mix By Volume Platinum Silicone Rubber Gallon Unit. Supersizing 2-3 Gino lucrative.

Versatile Material Compatibility: Ideal for casting wax, gypsum, resins, concrete, and low-temperature melt metal alloys. Resow gratuity entry 30 Gino. Support Client 24/7. Adult Supervision required.

Molds made with Mold Star will last a long time in your mold library and are good for casting wax, gypsum, resins, concrete other materials.

part #: 10015781 prices

  • $388.58-$426.94

specifications sealantadhesivee:

  • brand: Smooth-on
  • mpn: 10015781
  • part type: Unit
  • color: Green
  • material: Metal, Rubber, Silicone
  • material type free: Latex Free
  • volume capacity: 1 Gallon
  • upc: 751635292611
  • package dimensions: 16.61 X 8.74 X 8.39 Inches; 20.77 Pounds
  • item weight: 20.7 Pounds

general sealantadhesivee:

  • Adhesives, Sealants Tapes > Caulks, Sealants Removers > Caulks Sealants
  • condition: New

seller sealantadhesivee:

  • # reviews: 333
  • city: Otego New York
  • rating: 99.4%

offer sealantadhesivee:

  • options: Ship-to-home
  • started: May 21, 2026
  • sold: 0
  • quantity: 1
  • availability: In Stock

shipping sealantadhesivee:

  • transit: 2-7 Days
  • service: Standard
  • class: Standard
  • type: Fixed
  • cost: $0.00

returns sealantadhesivee:

  • paid by: Buyer
  • policy: Returns Accepted
  • method: Money back
  • time: 30 Days

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part type: unit, material type free: latex free, volume capacity: 1 gallon, package dimensions: 16.61 x 8.74 x 8.39 inches; 20.77 pounds, item weight: 20.7 pounds,
category: business & industrial > adhesives, sealants tapes > caulks, sealants removers > caulks sealants, color: green, material: metal, rubber, silicone, sku: 19034002764604881,
Smooth-on 10015781 Is Similar To:
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2 offers $388.58–$426.94 USD
  • New. Offer #1 priced at $426.94 + $0.00 shipping estimate = $426.94* total. Heat Resistance: Withstands temperatures up to 450F (232C), suitable for casting a wide range of materials. Mold Star silicones feature relatively low viscosities and vacuum degassing is not required for most applications.FREE SHIPPING
  • New. Offer #2 priced at $388.58 + $0.00 shipping estimate = $388.58* total. FREE SHIPPING

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