Article number: | 289P05 |
Availability: | In stock (4) |
Developed to optimize ceramic shell slurries, Primcote binder is the investment casting industry’s leading colloidal silica based primary binder. Primcote binder was formulated to eliminate buckling, lifting and cracking of primary shell coats.
Primcote binder allows faster drying of primary coats with lower humidity and/or increased air circulation. Shell coats using Primcote binder can not be over dried as shell coats using standard colloidal silica can.
Primcote binder contains a wetting agent, an antifoam agent and a color indicator to monitor shell dryness, as well as several other proprietary ingredients. Primcote binder is compatible with conventional refractory materials and shell room equipment.
Whether casting simple or complicated parts, Primcote binder is the industry’s primary binder of choice.
Base Composition |
Colloidal Silica |
Other Composition |
Proprietary |
Total Solids Content (Including SiO2) |
30.0%/weight |
Particle Size (Approximate) |
10 nm |
pH at 77°F (25°C) |
10.6 |
Specific Gravity |
1.18 |
Weight / Volume |
9.85 lbs/gal (1.18 kg/l) |
Na2O Content (Weight) |
0.48% |
Particle Charge |
Negative |
Color with ReDip™ indicator |
Greenish Yellow |
Color without ReDip indicator |
Milky White |
*These results are based on the testing methods, frequency and procedures of Ransom & Randolph or its approved suppliers.
The levels referenced herein are only for general guidance and do not constitute a firm specification.
If you currently have a primary slurry formulation, use the same percentages and loadings of your current refractories. The following formulations are for casters just starting out.
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Formula for 10 Gallons (lbs) |
Formula for 10 Liters (kgs) |
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Intended Slurry Use |
Target Slurry Density (g/ml) |
Target Viscosity (sec)** |
Primcote binder |
Ranco- Sil™ 4 fused silica |
Zircon (-200 mesh) |
Primcote binder |
Ranco-Sil 4 fused silica |
Zircon (-200 mesh) |
Ferrous |
2.99-3.03 |
16.5-18.5 |
43.9 |
— |
206.7 |
5.28 |
— |
24.85 |
Non- Ferrous |
1.69-1.73 |
21.8-27.1 |
47.0 |
95.4 |
— |
5.65 |
11.47 |
— |
**Viscosity measured using through the hole method with a #5 Signature Zahn cup.
Slurry Control Worksheets are available for download at www.ransom-randolph.com. Slurry Control Worksheets allow you to input data directly and help you calculate values.
R&R recommends running the following tests accordingly.
Slurry Test |
Recommended Testing Frequency |
Slurry Viscosity |
Two Times Per Shift |
Binder Solids |
Two Times Per Week |
Binder pH |
Weekly |
The target binder solids range for Primcote binder is 28.8-30.8% by weight.
Specific Gravity |
Binder Solids |
Specific Gravity |
Binder Solids |
Specific Gravity |
Binder Solids |
1.160 |
26.8 |
1.173 |
28.8 |
1.186 |
30.9 |
1.161 |
27.0 |
1.174 |
29.0 |
1.187 |
31.0 |
1.162 |
27.1 |
1.175 |
29.1 |
1.188 |
31.2 |
1.163 |
27.3 |
1.176 |
29.3 |
1.189 |
31.3 |
1.164 |
27.4 |
1.177 |
29.5 |
1.190 |
31.5 |
1.165 |
27.6 |
1.178 |
29.6 |
1.191 |
31.6 |
1.166 |
27.7 |
1.179 |
29.8 |
1.192 |
31.8 |
1.167 |
27.9 |
1.180 |
29.9 |
1.193 |
31.9 |
1.168 |
28.1 |
1.181 |
30.1 |
1.194 |
32.1 |
1.169 |
28.2 |
1.182 |
30.2 |
1.195 |
32.3 |
1.170 |
28.4 |
1.183 |
30.4 |
1.196 |
32.4 |
1.171 |
28.5 |
1.184 |
30.6 |
1.197 |
32.6 |
1.172 |
28.7 |
1.185 |
30.7 |
1.198 |
32.7 |
OSHA-approved respiratory protection should always be worn to avoid inhalation of respirable silica dust, which can result in an irreversible lung disease, silicosis. Such exposure includes slurry makeup, casting, knockout and cleanup. Refer to SDS for specific details.
Keep from freezing. Primcote binder must be maintained above 35°F (2°C) to prevent the material from precipitating irreversibly and making the product unsuitable for use. Binder stored in transparent or translucent containers should be sheltered from direct sunlight. Shelf life is 1 year from date (MMDDYY) in batch lot number on label. Rotate stock to maximize shelf life.
For additional information and recommendations, refer to the Shell Building, Slurry Control, Autoclaving, FlashFire Dewax Method and Viscosity Cup Correlations Technical Tips available for download at www.ransom-randolph.com.
Slurry Control Worksheet Download
As the conditions or methods of use are beyond our control, we do not assume any responsibility and expressly disclaim any liability for any use of this product. Information contained herein is believed to be true and accurate but all statements or suggestions are made without warranty, expressed or implied, regarding accuracy of the information, the hazards connected with the use of the material or the results to be obtained from the use thereof. Compliance with all applicable federal, state, and local regulations remains the responsibility of the user. All potential liability related to the sale and use of this product is limited to the cost of the particular goods sold in their respective transactions.