There are three classes of bottle defects. This topic was covered when I attended a seminar at PTTC.
Class A. Critical defects which prevent the glass jar form performing their intended function of safely holding the product. It may cause danger to consumer.
- Cracks anywhere in the jar.
- Broken of chipped finish.
- Contamination with dirt, insects, or any other foreign matter that cannot be easily removed by washing before filling.
Class B. Major defects that makes handling of jar difficult. Bottle durability is questionable.
- Glass weight is below specified minimum.
- Dimensions for height, diameter, volume or finish are outside tolerance.
- Leaners (deviation form verticality) in excess of specified tolerances.
Class C. Minor Defects which adversely affect the appearance but not the function of the jar.
- Uneven outer surface.
- Slight off-color glass.
- Rough mold lines.
Specific Glass Defects
1.Offset finish 2.Split finish 3.Bulged finish 4.Chipped finish 5.Checks under finish 6.Overpress 7.Corckage Check 8.Seam on side finish 9.Checked finish 10.Crizzled finish 11.Down finish 12.Out-of-round finish 13.Dirty finish 14.Threads not filled out 15.Tear under finish 16.Bent or crooked finish 17.Rough finish 18.Broken finish 19.Neck ring seam 20.Bent neck 21.Choked neck 22.Long neck 23.Hollow neck 24.Dirty neck 25.Pinched neck 26.Shoulder check 27.Thin shoulder 28.Sunken-shoulder 29.Hot checks 30.Pressure checks 31.Mold and Blank seams 32.Light sides 33.Bird Swing 34.Bruise checks 35.Letter checks 36.Flanged bottom 37.Light bottom 38.Heavy bottom 39.Rocker Bottom 40.Baffle Mark 41.Checked Bottom 42.Heel tap 43.Spikes 44.Washboard 45.Brush marks 46.Stones 47.Busters 48.Seeds 49.Cords 50.Black spots 51.Shear marks 52.Oil marks 53.Broken ware 54.Loading marks 55.Drag marks 56.Wrinkles or laps 57.Out-of-shape ware 58.Uneven distribution 59.Wavy appearance 60.Dirty appearance