Varistor Silver/Copper Paste

Varistor silver paste is known for its strong oxidation resistance, and excellent chemical and thermal stability, enabling it to form durable and highly conductive electrodes for metal-oxide varistor (MOV) applications. Its fired silver layer maintains stable electrical performance even under repeated surge events and long-term operating conditions, making it the preferred choice for high-end varistors that require superior consistency and minimal energy loss.

Varistor copper paste, in contrast, offers a more economical solution while maintaining adequate conductivity and good solderability when sintered in a reducing atmosphere. Although copper is more sensitive to oxidation, optimized formulations ensure dependable performance, making it well-suited for cost-driven varistor production where a balance between functional requirements and material savings is essential.

Our Products

Alfa Chemistry offers high-quality varistor silver paste and varistor copper paste engineered to ensure stable conductivity, strong adhesion, and long-term reliability in varistor electrode fabrication. The key parameters of these products are listed in the table below.

Product Advantages

• Our products exhibit excellent paste dispersibility and printability.
• Our products demonstrate superior substrate adhesion and solderability.
• The sintered silver and copper layers feature outstanding electrical performance.
• Our products possess excellent storage stability and batch consistency.
• Our products are free from hazardous substances such as lead and cadmium, complying with RoHS standards.

You Need to Know

• Pre-use handling: Before use, allow the paste to return to room temperature, then mix thoroughly with a planetary homogenizer for 3–5 minutes, or stir mechanically for 5–10 minutes. Avoid overly vigorous stirring to prevent air bubble introduction.
• Storage conditions: 5–10 °C, sealed and protected from light.
• Shelf life: 3 months.
• Safety instructions: Our products contain volatile organic solvents. Keep them away from open flames and heat sources to avoid affecting product performance.