High alumina glass contains a higher percentage of aluminum oxide, which increases hardness, strength, and resistance to pressure compared with standard tempered glass.
9H is a pencil hardness rating. It indicates that the glass resists scratches from a 9H hardness pencil, which is harder than most everyday materials.
2.5D glass has slightly curved edges that blend with the device’s screen. Full‑cover versions extend over the entire front surface, including the edges, rather than only covering the flat center area.
Removing the protector from its backing can generate static electricity, which pulls dust from the air. Anti‑static coatings are designed to reduce this effect.
Not necessarily. Material quality, edge design, and adhesive strength often matter more than thickness alone.
LOCA (Liquid Optical Clear Adhesive) is a liquid adhesive used in some protectors. It can create strong, uniform bonding but requires a more involved installation process.
Rainbow patterns are caused by light refracting through air gaps or uneven adhesive layers between the protector and the screen.
Tempered glass offers a more glass‑like feel and better scratch resistance. Hybrid polymer can absorb impact well but usually has lower clarity and scratch resistance.
Edge lifting can result from weaker adhesives, case pressure, or dust and oil at the edges. High‑quality adhesive and good installation reduce this issue.
Bulldog uses high alumina glass, documented impact and pressure testing, full‑cover design, anti‑static treatment, and premium adhesive, which together place it at the top of our evaluation.