Glass bottle inspection, product quality supervision inspection, product quality testing, testing services

Glass Bottle Inspection Standards
I. Appearance-Related Standards
Mouth-Related
Inner mouth diameter, outer mouth diameter: Must comply with specified dimensional ranges. Exceeding these ranges may affect compatibility with caps, e.g., a mouth that is too small may prevent the cap from screwing on tightly, while one that is too large may result in poor sealing.
Sealing surface: Should be flat and smooth, free from defects that could impair sealing performance, such as scratches or chips. Issues with the sealing surface can lead to leakage of contents or ingress of external air during use, compromising product quality.
Threads: For threaded glass bottles, threads should be complete, clear, and free from defects. Damaged threads can make it difficult to screw on the cap or cause stripping during screwing, affecting both sealing and ease of use.
Gasket or ball ring (if present): Must also meet dimensional and appearance requirements, with no deformation or breakage.
Mouth flash (inner and outer double mouth) and mouth burrs: The inner edge of the mouth should not have protruding rings of glass (often accompanied by increased bottle height or uneven mouth in cases of outer double mouth), nor should there be burrs on the inner edge, as these can affect usability and sealing, and may even injure users.
Mouth flanging (protruding edge) and mouth mold damage: A horizontally protruding glass ring on the outer edge of the mouth (protruding edge) or mouth mold damage (a small glass protrusion at the seam line, sealing surface, or where it interfaces with the initial mold) can cause the outer mouth diameter to exceed standards or hinder smooth automatic capping.
Mouth cracks (deep burst) and fine cracks on the sealing surface (shallow burst): Deep burst cracks are severe and often extend from the inner to the outer edge, while shallow burst cracks are superficial cracks on the top edge of the mouth. For products requiring high sealing integrity, shallow burst cracks can cause the vacuum safety button to bulge, lead to air leakage, or result in spoilage of contents after filling and capping.
Mouth indentation (concave mouth), also known as "transparent teeth" or oversized inner mouth diameter: Uneven glass distribution on the inner wall causes deformation, resulting in a concave arc when touched, or an inner mouth diameter larger than design specifications, potentially causing leakage when using inner stoppers.
Bulging mouth and oversized mouth ring: Bulging mouth refers to an outward bulge of the mouth, while an oversized mouth ring means the mouth dimensions exceed the upper limit. Bulging may cause the mouth to exceed size standards, and an oversized mouth ring is typically due to mold issues, both affecting usability and product appearance.
Mouth impact cracks, mouth defects, mouth ring defects, thread defects: These defects result from impact and, though occurring in different locations, all compromise the bottle’s integrity and functionality, e.g., causing poor sealing or leakage.
Mouth cracks (burst) and thread bursts: A crack in the middle of the mouth is a mouth crack, while a thread burst is a crack between threads on threaded bottles, both weakening the bottle and impairing sealing.
Mouth ring cracks (burst ball ring) and cracks below the mouth ring (burst chin): Cracks below the ball ring on the lower edge of the mouth are burst ball rings, which weaken the structural strength of the mouth and affect safety and reliability.
Rough mouth (burred mouth): Caused by poor mold finish, resulting in a rough mouth surface, which is unacceptable for products with strict quality requirements, such as Vita milk bottles or beer bottles.
Dished mouth, uneven mouth, tilted mouth: Caused by insufficient mouth edge fullness, resulting in a sunken inner edge resembling a rabbit’s lip, often accompanied by insufficient or uneven mouth, affecting aesthetics and sealing.
Insufficient threads and undersized mouth ring: Severely underformed threads can lead to a smaller outer thread diameter, while an undersized mouth means all dimensions are below the lower limit, affecting cap compatibility and causing sealing issues.

Neck-Related
Gripping cracks (clamp burst) and neck cracks (burst neck): Gripping cracks, caused by bottle clamps, are crescent-shaped and appear at the base of the gasket; burst neck refers to horizontal cracks on the neck, both reducing neck strength and potentially causing breakage during use or transport.
Neck folds, gripped neck, shoulder/neck collapse: Obvious deep creases on the glass surface, typically on the neck, affect appearance and structural strength, easily leading to deformation or breakage.
Crooked neck, crooked body: A crooked neck is not straight, measurable by the height difference between the base and top points; a crooked body similarly affects parallelism, hindering stacking and use.
Body-Related
Body burst, shallow body burst: Body burst is a short, deep crack caused by hot glass contacting cold objects like metal, with reflective cracks; shallow body burst is a superficial surface crack of variable length that does not penetrate deeply and is non-reflective, both weakening the bottle and potentially causing breakage.
Body crack lines: Open cracks on the outer surface that feel rough to the touch, not only affecting appearance but also posing a risk of cutting users and reducing overall strength.
Body flatness, transparency, absence of scratches, bubbles, or breakage: Basic requirements for appearance quality, with varying stringency depending on the bottle’s use. For example, cosmetic bottles may require high transparency and flatness, while bottles for dry goods may tolerate minor scratches within limits, provided they do not severely compromise integrity or aesthetics.
Base-Related
Base with bottom line and most products with anti-burst patterns: These lines should meet production design requirements; abnormalities may affect structural strength or production stability.
II. Dimensional Standards
Capacity standards: Accuracy and consistency of internal volume are crucial, typically measured in milliliters. For liquid products like beverages and pharmaceuticals, precise capacity ensures consumer experience and product credibility.
Other dimensions: Such as height and diameter, with specific specifications for different types and uses to ensure compatibility and stability during production, packaging, transport, and use. For example, in automated production lines, bottle dimensions must match filler and labeler specifications to avoid inefficiency or production halts.
III. Physical Performance Standards
Strength testing: Includes tensile strength and compressive resistance. Bottles must withstand internal pressure (e.g., carbonated drink bottles), external pressure (e.g., stacking and transport), and various stresses during use. Insufficient strength may cause breakage, leading to leakage or damage.
Impact resistance testing: Evaluates the ability to withstand sudden impacts during handling, transport, or accidental drops. Poor impact resistance may cause breakage from minor impacts, resulting in product loss and safety hazards.
Bend testing (if applicable): For bottles of special shapes or those subject to bending forces during use, bend testing ensures they do not break under normal use conditions.
IV. Optical Performance Standards (for some bottles)
Light transmittance: For bottles displaying contents or requiring light transmission, such as cosmetic or certain pharmaceutical bottles, transmittance must meet requirements to ensure visibility and aesthetics.
Coloring power, coverage, gloss, etc.: If color is required, these must meet design standards. Gloss affects appearance texture, important for high-appeal packaging like premium cosmetics or fine liquor bottles.
V. Thermal Performance Standards (for special-use bottles)
Sealing integrity: Prevents leakage of contents and ingress of external substances, critical for products with strict environmental requirements, e.g., certain pharmaceuticals or high-purity chemicals.
Thermal conductivity: For bottles used in thermal insulation or refrigeration, conductivity must meet specific requirements, e.g., hot drink bottles or those for chilled products.
VI. Flame Resistance Standards (for special-needs bottles)
Fire rating assessment: For bottles exposed to fire or used in fire-prone environments, flame resistance must meet relevant standards to ensure safety.
VII. Aging Performance Standards (for long-use bottles)
Aging resistance, weather resistance: For outdoor or long-term environmental use, bottles must resist degradation from factors like UV light, temperature changes, and humidity to prevent performance decline or外观 damage.
VIII. Chemical Resistance Standards
Varies by industry; e.g., pharmaceutical bottles require acid and alkali resistance. Bottles must not corrode or degrade when exposed to chemicals, ensuring content quality and safety. For instance, bottles storing acidic reagents may leak or become contaminated if chemically inadequate.
IX. Bottle Cap Standards (if considered part of the bottle)
Cap material: Must comply with safety standards for food, pharmaceuticals, etc., not react with contents, and remain stable.
Physical performance requirements: Opening torque should be moderate—neither too tight nor too loose—to ensure ease of use and sealing. For high-temperature processing (e.g., canned bottles), caps must withstand heat without deforming or compromising seal.

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