KEY-Sliver 6# Photo Emulsion

Product Highlights

Scope of application

Suitable for high-precision electronic products such as PCB, FPC, mobile phone cover plates, solar cell back electrodes/back aluminum, as well as fine line and dot screen printing.

Product Features

Exposure time

How to use

• Sensitization: Dissolve diazonium salt in approximately 70-100 grams of purified water. Pour the diazonium solution into the photosensitive emulsion and stir thoroughly with a glass rod or wooden stick. Allow bubbles to dissipate completely before use.
• Coating: Apply using a high-quality squeegee. Coating characteristics depend on screen size and tension. Determine the number of coating passes required to achieve the desired film thickness based on printing needs. For two or more coating passes, ensure the screen from the previous pass is completely dry before proceeding; otherwise, film peeling may occur.
• Drying: Optimal drying temperature is below 40°C. Excessive heat may cause thermal reactions in the photosensitive emulsion, compromising plate-making results. Ensure screens are thoroughly dried.
• Exposure: Optimal wavelength is 300-400nm. Results are enhanced using ultra-high-pressure mercury lamps or high-pressure gallium-iodine lamps.
• Development: Use a high-pressure water gun or spray gun to flush the plate surface at a constant speed.
• Drying: After development, first remove surface moisture from the screen before placing it in a drying oven below 40°C. Ensure thorough drying; otherwise, the screen may experience emulsion loss.
• Secondary Exposure: Expose the S-side for 1-2 times the exposure time of the P-side to significantly improve print durability.
• Curing: After the screen is completely dry, evenly apply the mixed A+B curing solution to both the P and S sides. After 1-2 minutes, use an air gun to blow through the ink-flow area. Dry for 20-30 minutes to significantly improve the screen's print durability.

Precautions

• Photosensitive emulsion storage: The optimal storage temperature for unsensitized photosensitive emulsion is 20℃ in a cool, dark place. Do not store it above 25℃ or below 5℃, otherwise chemical and physical changes may occur, affecting normal use. Diazo emulsion should be stored in a refrigerator at 0-5℃.
• Degreasing the screen: Before coating the photosensitive emulsion, the screen should be thoroughly cleaned with a special degreasing agent to remove grease and dirt. After thorough cleaning and drying, a high-quality screen can be obtained and printing durability improved.
• Diazo dissolution: Pure water or purified water should be used to dissolve diazo. If tap water is used directly, the minerals and rust in the tap water will react chemically with the photosensitive emulsion, affecting its performance. In severe cases, the emulsion may clump together and become unusable.
• Drying oven temperature: The optimal temperature for the drying oven is below 40℃. Temperatures exceeding 40℃ can cause a thermal reaction in the photosensitive emulsion, reducing resolution. The drying oven should have an exhaust system to remove moisture and improve the efficiency of complete screen drying. The internal temperature of the oven should be checked monthly to ensure it matches the set temperature.
• Winter development: If the developing water temperature is too low in winter, it will cause poor development of the screen and a decrease in resolution. It is recommended to use warm water (25℃) for development.

Transportation and storage

Transport using clean trucks, with each package stacked no more than five layers high, and the bottom layer secured with a non-slip pallet to prevent squeezing, deformation, or tipping.

Keep sealed, avoid direct sunlight and high heat.

Unopened and unsensitized, the product has a 12-month shelf life.