Litho Varnish (High-Tack Offset Varnish)
High-tack litho varnish is a pre-compounded offset ink vehicle composed of hard resins, drying oils, and hydrocarbon diluents, designed to impart maximum tack and short body to sheetfed offset inks. Supplied as a ready-to-use concentrate, it simplifies ink formulation while ensuring consistent tack, gloss, and oxidative dry response across diverse paper and board substrates.
Technical Specifications
| appearance | Dark amber to brown viscous paste |
| acid value (mgKOH/g) | 5–20 |
| drying time (h, sheetfed) | 4–8 |
| viscosity (Poise, 40 °C) | 80–250 |
| tack (Inkometer, 400 rpm, 32 °C) | 16–24 |
Applications
- Sheetfed offset ink vehicle for high-tack formulations
- Black and process color offset ink varnish base
- Specialty high-tack inks for fibrous stock
- Offset overprint varnish base for packaging
- Tack adjustment concentrate for press-side ink modification
Key Features
- Ready-to-use concentrate simplifying offset ink formulation
- Maximum tack for sharp dot reproduction on coated art paper
- Balanced short body for fast ink distribution in the press train
- Compatible with process and special inks across all offset formats
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