Name: Anti-Blocking Agent Silica ABS-5
Brand: Coatingsink
SKU: anti-blocking-agent-silica-abs
Availability: InStock

Question 1

How does particle size D50=5 µm affect gloss in overprint varnishes?

Accepted Answer

At D50=5 µm, ABS-5 reduces 60° gloss by typically 2–6 GU when dosed at 2–5%. Finer grades (D50 < 3 µm) give less gloss loss but weaker blocking protection; coarser grades (D50 > 8 µm) may introduce visible haze in high-gloss applications. ABS-5 strikes the optimum balance for mid-gloss and semi-gloss overprint varnishes.

Question 2

What is the recommended incorporation method for ABS-5 in gravure ink systems?

Accepted Answer

Pre-disperse ABS-5 in a portion of solvent or binder at high shear (≥ 1500 rpm) before let-down with the main batch. Avoid prolonged milling, which breaks agglomerates to sub-3 µm fines and reduces anti-blocking efficacy. Typical dosage is 2–8% of dry formulation weight depending on slip and blocking requirements.

Question 3

Does ABS-5 cause haze in transparent packaging film coatings?

Accepted Answer

ABS-5 has a refractive index of approximately 1.46, close to most acrylic and vinyl binders (RI 1.47–1.50), which minimises haze in clear varnish applications when dosed below 5%. At loadings above 8%, slight milkiness may appear in very thin films. For transparent packaging windows, limit use to ≤ 4% and verify with draw-down tests on the target substrate.

Oil Absorption	200–240 mL/100g
SiO₂ Content	≥ 99%
pH (5% slurry)	6.0–7.5
BET Surface Area	300–350 m²/g
Median Particle Size (D50)	5 µm

Anti-Blocking Agent Silica ABS-5

Specifications

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