Abstract: A test apparatus comprises a probe movably mounted relative to a carrier. The probe comprises an end portion with a surface area of about 5 mm2 or less. The test apparatus can be used in methods of determining a crush strength of an edge of a substrate. Methods can comprise aligning the probe with a test location of the substrate at a predetermined angle relative to a probe axis. Methods can further comprise applying a mechanical force to the test location with the probe in the direction of the probe axis. Also, methods can comprise increasing the mechanical force applied by the probe until the substrate cracks or a predefined force applied by the probe is reached. Based on the mechanical force applied by the probe, a crush strength of an edge can be determined.

Abstract: A screen protector comprises a glass-based substrate and an adhesive. The glass-based substrate comprises a first major surface, a second major surface, a thickness, and an edge. The first major surface comprises a first planar portion and a peripheral portion extending outwardly from the first planar portion. The second major surface comprises a second planar portion opposite the first planar portion and is parallel to the first planar portion. The edge comprises an outer peripheral surface that intersects the peripheral portion of the first major surface. The adhesive comprises a first major surface, a second major surface, a thickness, and an edge. The first major surface of the adhesive is adhered to the second major surface of the glass-based substrate.

Abstract: A test apparatus comprises a probe movably mounted relative to a carrier. The probe comprises an end portion with a surface area of about 5 mm2 or less. The test apparatus can be used in methods of determining a crush strength of an edge of a substrate. Methods can comprise aligning the probe with a test location of the substrate at a predetermined angle relative to a probe axis. Methods can further comprise applying a mechanical force to the test location with the probe in the direction of the probe axis. Also, methods can comprise increasing the mechanical force applied by the probe until the substrate cracks or a predefined force applied by the probe is reached. Based on the mechanical force applied by the probe, a crush strength of an edge can be determined.

Abstract: A screen protector comprises a glass-based substrate and an adhesive. The glass-based substrate comprises a first major surface, a second major surface, a thickness, and an edge. The first major surface comprises a first planar portion and a peripheral portion extending outwardly from the first planar portion. The second major surface comprises a second planar portion opposite the first planar portion and is parallel to the first planar portion. The edge comprises an outer peripheral surface that intersects the peripheral portion of the first major surface. The adhesive comprises a first major surface, a second major surface, a thickness, and an edge. The first major surface of the adhesive is adhered to the second major surface of the glass-based substrate.