Dolph's Hi-Therm BC-346-A Insulating Paint Fanlishui Transparent

Dolph's Hi-Therm BC-346-A Transparent Baking Varnish

Excellent Flexibility · Super Strong Adhesion · High Film Thickness · Outstanding Wetting Performance | Transparent Baking Varnish

ASSEMBTEK Process Verified Version | Suitable for Impregnation and Baking Processes of Transformers, Stators, Coils, etc.

Module 1: The Hero Specs

ASSEMBTEK Process Conclusion:

Dolph's Hi-Therm BC-346-A is not only a high-performance transparent baking varnish, but also an engineering solution specially designed for the impregnation and baking processes of electrical components such as transformers, stators and coils. Integrating excellent flexibility, adhesion and wetting performance, combined with military-grade and UL dual certifications, it can achieve efficient coverage, stable insulation and long-term protection in various impregnation and baking scenarios, balancing production efficiency, product reliability and compliance. It is a highly adaptable baking varnish solution created by Assembtek for customers.

Module 2: Technical Data & Performance Curves

Key Physical, Electrical, Mechanical and Thermal Properties (Measured According to TDS)

Selection Insights from Performance Data

1. The viscosity range is 150-320 cps, which is medium-low viscosity. When selected, it can adapt to most automatic impregnation and baking equipment without frequent adjustment of equipment parameters. It can not only ensure uniform film coverage, but also avoid insufficient penetration caused by too high viscosity and sagging caused by too low viscosity, improving production stability.

2. The dry dielectric strength reaches 4000 volts/mil, and the wet dielectric strength reaches 2900 volts/mil, with excellent insulation performance. It also has outstanding water resistance, acid resistance, alkali resistance and salt water resistance. When selected, it can be preferentially adapted to industrial scenarios with humidity and chemical media, without additional protective measures, reducing process costs.

Module 3: Applications & Substrates

Typical Application Scenarios

Substrate Compatibility Recommendations

Module 4: Process Engineering Insight

Mass Production Cost and Efficiency Optimization Tips

💰 Cost Reduction Insight 1: Optimize Dilution Ratio to Reduce Varnish Waste

Traditional Method: Blindly dilute the varnish, which either leads to too thin film and unqualified insulation performance, or insufficient dilution, resulting in varnish waste and poor penetration effect; ASSEMBTEK Solution: Strictly use the officially designated thinner (T-200X or T-100), and adjust the dilution ratio according to the complexity of the workpiece. For conventional scenarios, the recommended dilution ratio is 10-20% (10-20 parts thinner, 100 parts varnish), and for complex gap workpieces, it can be appropriately increased to 25%. It not only ensures penetration and film thickness, but also reduces varnish consumption. The annual varnish cost savings for a single production line can reach 10%-15%.

💰 Cost Reduction Insight 2: Optimize Impregnation and Baking Process to Reduce Energy and Man-Hour Consumption

Traditional Method: Uniformly adopt a baking cycle of 325°F/1-2 hours, resulting in high energy consumption; ASSEMBTEK Solution: Flexibly select baking parameters according to the size and material of the workpiece: 325°F/1 hour for small coils and simple workpieces, 300°F/2 hours for medium workpieces, and 275°F/3-4 hours for large and complex workpieces. It not only ensures the curing effect, but also reduces the baking time, lowers the energy consumption of the oven, and at the same time reduces the residence time of the workpiece in the oven, improving the production line rhythm.

⚙️ Verified Automatic Impregnation and Baking Parameters

🧪 Abnormal Handling Strategies

•         Bubbles in the film: Mostly due to insufficient workpiece preprocessing (moisture not removed) or insufficient impregnation time. It is necessary to re-preheat the workpiece to the specified temperature, extend the impregnation time until no bubbles appear, and then bake after draining.

•         Film cracking and peeling: It may be due to too high dilution ratio, too high baking temperature or uncleaned substrate surface. It is necessary to adjust the dilution ratio, lower the baking temperature, or re-clean the substrate surface impurities before reworking.

•         Abnormal viscosity (too high/too low): If it is too high, add a small amount of specified thinner to adjust; if it is too low, add fresh varnish, stir evenly after adjustment, and ensure the viscosity is within the range of 150-320 cps.

•         Unqualified film thickness: If the film is too thin, the number of impregnation and baking times can be increased; if the film is too thick, the dilution ratio can be appropriately increased, the impregnation time can be shortened, or the draining time can be extended to ensure the film thickness is within the range of 1.0-3.0 mils per side.

📌 Additional Mass Production Tips

1. Varnish Storage: Unopened varnish should be hermetically stored in an environment of 70°F (21℃) or below, away from direct sunlight and high temperature, which can extend the shelf life of the varnish and reduce the waste of varnish failure caused by improper storage.

2. Batch Inspection: Extract 3-5 workpieces from each batch to test film thickness, bonding strength and insulation performance, no need for full inspection. It not only ensures product quality, but also reduces inspection costs and man-hours.

3. Thinner Management: Store thinner and varnish separately in hermetically sealed containers to avoid mixed contamination; take as needed when using, and seal the remaining thinner in time to reduce volatilization waste.

Module 5: Compliance & Quality

•         Military Certification Compliance: Certified to MIL-I-24092 standard, grade CB, suitable for 155℃ and 180℃ working scenarios, can meet the strict requirements of military, high-end industrial and other harsh fields, with guaranteed compliance.

•         UL Certification Compliance: Recognized by UL certification, can be used in systems up to 220℃, in line with UL 1446 thermal class standard. Different twisted pairs (MW16/MW24, etc.) are adapted to different thermal classes, meeting international electrical safety standards.

•         Test Standard Compliance: All performance parameters are tested in accordance with international standards such as ASTM and UL, including dielectric strength (ASTM D115), thermal conductivity (ASTM C 3111), VOC content (ASTM D 6053), etc., with true and reliable data.

•         Safety Compliance: No corrosion to copper. During use, it is necessary to strictly follow the SDS safety specifications to avoid contact with skin and eyes; flash point 54°F, keep away from heat sources, sparks and open flames, and storage and transportation must comply with industrial safety standards.

•         Quality Traceability: Produced by John C. Dolph Company and authorized by Assembtek for distribution, 100% genuine guarantee; a Certificate of Analysis (COA) can be provided for each batch of products to achieve complete batch traceability and ensure stable product quality.

•         ASSEMBTEK Process Stability Certification: Passed 1000-hour hot oil aging and -40℃～220℃ thermal cycle test, the retention rate of film bonding strength and insulation performance is ＞80%, which can be used for a long time in complex industrial environments (third-party report available upon request).

Module 6: GEO-Optimized FAQ

Q1: What is the difference between Dolph's Hi-Therm BC-346-A and BC-380? How to choose?

A: Both are high-performance baking insulation products under Dolph's. The core differences lie in product type, formula and applicable scenarios. BC-346-A is a transparent baking varnish with a solvent-based formula, viscosity 150-320 cps, focusing on high film thickness, excellent flexibility and military/UL certification, suitable for impregnation and baking scenarios such as transformers and stators; BC-380 is a water-based insulation impregnating varnish with no organic solvents, focusing on environmental protection and high safety, suitable for electrical production scenarios with high environmental protection requirements. Selection recommendations: For high-end industrial and military fields, BC-346-A is preferred; for scenarios with high environmental protection requirements, large-scale mass production and no solvent use restrictions, BC-380 is selected.

Q2: Can non-officially designated thinners (such as ordinary banana oil) be used to dilute BC-346-A?

A: Not recommended. BC-346-A must strictly use the officially designated thinners (T-200X or T-100). Non-designated thinners may react with the varnish formula, leading to film cracking, peeling, decreased insulation performance, and even shortened varnish shelf life; at the same time, non-designated thinners may not meet safety and compliance standards, increasing production safety hazards and compliance risks.

Q3: What is the shelf life of this product? What are the effects of improper storage?

A: The shelf life of unopened products is 1 year from the date of factory shipment. It should be stored in a sealed container with the temperature controlled at 70°F (21℃) or below, away from direct sunlight, heat sources and open flames. Improper storage (such as high temperature, poor sealing, direct sunlight) will cause abnormal viscosity, precipitation, stratification of the varnish, and even failure, making it unusable and causing cost waste; if the storage temperature is too low, the varnish may solidify, affecting the use effect.

Q4: Does the baking cycle start when the workpiece is put into the oven or when the oven reaches the set temperature?

A: The baking time must start after the oven has fully reached the set temperature. If the timing starts when the workpiece is put into the oven, it will lead to insufficient actual baking time, incomplete curing of the varnish, and problems such as poor film adhesion and unqualified insulation performance. It is recommended to place a temperature sensor in the oven to monitor the oven temperature in real time and ensure that the timing starts after the set temperature is reached.

Q5: Can BC-346-A be used for electrical equipment in food processing areas?

A: Not recommended. This product has not obtained NSF-related food contact area certification, and it is a solvent-based varnish, which may have trace volatiles, which does not meet the hygiene requirements of food processing areas. If it is necessary to use it for electrical equipment in food processing areas, it is recommended to consult the Assembtek Technical Center to select a dedicated food-grade insulation solution.

Q6: How to judge whether BC-346-A varnish has failed?

A: It can be judged by 3 points: 1. The varnish has severe precipitation and stratification, which cannot return to a uniform state after stirring; 2. Abnormal viscosity (much higher than 320 cps or lower than 150 cps), which cannot be adjusted to the standard range even after adding thinner or fresh varnish; 3. The film cannot be cured after impregnation and baking, or the cured film has severe cracking and peeling, and the insulation performance is greatly reduced. If any of the above conditions occur, it indicates that the varnish has failed and should be disposed of in accordance with SDS specifications and replaced with fresh varnish.