Videos, infographics, weekly quick question, and bottle shape profile articles. Linerless closures, with a plug or land seal, and dispensing plugs and fitments require a controlled "I" dimension for a proper fit. The first number refers to the diameter (in millimeters) measured across the inside of the cap’s opening or the outside of the bottle’s threads. In the UK (and probably elsewhere, but I don't know if the threads are the same), we currently have the two shown in the photos below. and Greater, Standard Specification for Polyethylene Terephthalate Film and Sheeting, Standard Test Method for Environmental Stress Crack Resistance (ESCR) of Threaded Plastic Closures, Standard Test Method for Protrusion Puncture Resistance of Stretch Wrap Film, Standard Test Method for Corona-Treated Polymer Films Using Water Contact Angle Measurements, Standard Practice for Cutting Film and Sheeting Test Specimens, Standard Guide for Determination of Thickness of Plastic Film Test Specimens, Standard Test Method for High Speed Puncture Properties of Plastic Films Using Load and Displacement Sensors, Standard Practice for Defect Detection and Rating of Plastic Films Using Optical Sensors, Standard Classification System and Basis for Specification for Specifying Plastic Films, Standard Test Method for Determining Plastic Film Thickness and Thickness Variability Using a Non-Contact Capacitance Thickness Gauge, Standard Classification System and Basis for Specification for Polyethylene Terephthalate Film and Sheeting, Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics, Standard Test Method for Tensile Properties of Plastics, Standard Test Method for Compressive Properties of Rigid Plastics, Standard Test Method for Shear Strength of Plastics by Punch Tool, Standard Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materials, Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials, Standard Test Method for Bond or Cohesive Strength of Sheet Plastics and Electrical Insulating Materials, Standard Test Method for Stiffness Properties of Plastics as a Function of Temperature by Means of a Torsion Test, Standard Test Method for Resistance of Transparent Plastics to Surface Abrasion by the Taber Abraser, Standard Test Method for Tensile Properties of Plastics by Use of Microtensile Specimens, Standard Test Method for Tensile-Impact Energy to Break Plastics and Electrical Insulating Materials, Standard Test Method for Indentation Hardness of Rigid Plastics by Means of a Barcol Impressor, Standard Test Methods for Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics, Standard Test Method for High Speed Puncture Properties of Plastics Using Load and Displacement Sensors, Standard Practice for Plastics: Dynamic Mechanical Properties: Determination and Report of Procedures, Standard Terminology for Plastics: Dynamic Mechanical Properties, Standard Test Method for Photoelastic Measurements of Birefringence and Residual Strains in Transparent or Translucent Plastic Materials, Standard Test Method for Plastics: Dynamic Mechanical Properties Melt Rheology, Standard Test Method for Plastics: Dynamic Mechanical Properties: Cure Behavior, Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics, Standard Test Method for Plastics: Dynamic Mechanical Properties: In Flexure (Three-Point Bending), Standard Test Method for Plastics: Dynamic Mechanical Properties: In Compression, Standard Test Method for Plastics: Dynamic Mechanical Properties: In Tension, Standard Test Methods for Plane-Strain Fracture Toughness and Strain Energy Release Rate of Plastic Materials, Standard Test Method for Tensile Properties of Reinforced Thermosetting Plastics Using Straight-Sided Specimens, Standard Test Method for Plastics: Dynamic Mechanical Properties: In Torsion, Standard Test Method for Plastics: Dynamic Mechanical Properties: In Flexure (Dual Cantilever Beam), Standard Test Method for Impact Resistance of Flat, Rigid Plastic Specimen by Means of a Striker Impacted by a Falling Weight (Gardner Impact), Standard Guide for Material Properties Needed in Engineering Design Using Plastics, Standard Test Method for Impact Resistance of Flat, Rigid Plastic Specimens by Means of a Falling Dart (Tup or Falling Mass), Standard Test Methods for Physical Dimensions of Solid Plastics Specimens, Standard Test Method for Determining the Charpy Impact Resistance of Notched Specimens of Plastics, Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point Bending, Standard Test Method for Evaluation of Scratch Resistance of Polymeric Coatings and Plastics Using an Instrumented Scratch Machine, Standard Test Method for Flexural Fatigue Properties of Plastics, Standard Test Method for Uniaxial Fatigue Properties of Plastics, Standard Test Method for Index of Refraction of Transparent Organic Plastics, Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics, Standard Test Method for Transparency of Plastic Sheeting, Standard Test Method for Specular Gloss of Plastic Films and Solid Plastics, Standard Test Method for Color Determination of Plastic Pellets, Standard Test Method for Diffuse Light Transmission Factor of Reinforced Plastics Panels, Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Interior-Profile Extrusions, Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Siding, Standard Specification for Glass-Fiber-Reinforced Polyester Plastic Panels, Standard Specification for Chlorinated Polyethylene (CPE) Sheeting for Concealed Water-Containment Membrane, Standard Test Methods for Impact Resistance of Rigid Poly(Vinyl Chloride) (PVC) Building Products, Standard Specification for Rigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit, Standard Test Method for Impact Resistance of Poly(Vinyl Chloride) (PVC) Rigid Profiles by Means of a Falling Weight, Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Flexible Concealed Water-Containment Membrane, Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Exterior-Profile Extrusions Used for Assembled Windows and Doors, Standard Practice for Installation of Rigid Poly(Vinyl Chloride) (PVC) Siding and Soffit, Standard Test Method for Predicting Heat Buildup in PVC Building Products, Standard Test Method for Windload Resistance of Rigid Plastic Siding, Standard Specification for Glass-Fiber Reinforced Polyester Wall and Ceiling Panels, Standard Specification for Poly (Vinyl Chloride) (PVC) Gaskets for Drain, Waste, and Vent (DWV), Sewer, Sanitary, and Storm Plumbing Systems, Standard Test Method for Relative Rigidity of Poly(Vinyl Chloride)(PVC) Siding, Standard Specification for Polyethylene Stay In Place Form System for End Walls for Drainage Pipe, Standard Specification for Polypropylene (PP) Siding, Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Siding with Foam Plastic Backing (Backed Vinyl Siding), Standard Specification for Insulated Vinyl Siding, Standard Specification for Color and Appearance Retention of Solid and Variegated Color Plastic Siding Products using CIELab Color Space, Standard Test Method for Using Reflectance Spectra to Produce an Index of Temperature Rise in Polymeric Siding, Standard Test Method for Compressive Properties of Plastic Lumber and Shapes, Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastic Lumber and Related Products, Standard Test Method for Bulk Density And Specific Gravity of Plastic Lumber and Shapes by Displacement, Standard Test Methods for Compressive and Flexural Creep and Creep-Rupture of Plastic Lumber and Shapes, Standard Test Methods for Mechanical Fasteners in Plastic Lumber and Shapes, Standard Test Method for Determination of the Linear Coefficient of Thermal Expansion of Plastic Lumber and Plastic Lumber Shapes Between –30 and 140°F (–34.4 and 60°C), Standard Specification for Polyolefin-Based Plastic Lumber Decking Boards, Standard Specification for Polymeric Piles, Standard Specification for Polyethylene-Based Structural-Grade Plastic Lumber for Outdoor Applications, Standard Guide for Techniques to Separate and Identify Contaminants in Recycled Plastics, Standard Practice for Determination of Contamination in Recycled Poly(Ethylene Terephthalate) (PET) Flakes and Chips Using a Plaque Test, Standard Practice for Separation and Identification of Poly(Vinyl Chloride) (PVC) Contamination in Poly(Ethylene Terephthalate) (PET) Flake, Standard Practice for Separation of Contaminants in Polymers Using an Extruder Filter Test, Standard Practice for Separation and Washing of Recycled Plastics Prior to Testing, Standard Practice for Coding Plastic Manufactured Articles for Resin Identification, Standard Test Method for Pin-Bearing Strength of Plastics, Standard Practice for Fabrication of Ring Test Specimens for Glass-Resin Composites, Standard Test Method for Tensile Properties of Glass Fiber Strands, Yarns, and Rovings Used in Reinforced Plastics, Standard Practice for Classifying Visual Defects in Parts Molded from Reinforced Thermosetting Plastics, Standard Practice for Classifying Visual Defects in Glass-Reinforced Plastic Laminate Parts, Standard Test Method for Ignition Loss of Cured Reinforced Resins, Standard Test Methods for Void Content of Reinforced Plastics, Standard Practice for Classifying Reinforced Plastic Pultruded Shapes According to Composition, Standard Test Method for In-Plane Shear Strength of Reinforced Plastics, Standard Test Method for In-Plane Shear Strength of Pultruded Glass-Reinforced Plastic Rod, Standard Test Method for Tensile Properties of Pultruded Glass-Fiber-Reinforced, Standard Specification for Dimensional Tolerance of Thermosetting Glass-Reinforced Plastic Pultruded Shapes, Standard Practice for Classifying Visual Defects in Thermosetting Reinforced Plastic Pultruded Products, Standard Test Method for Apparent Horizontal Shear Strength of Pultruded Reinforced Plastic Rods By the Short-Beam Method, Standard Test Method for Flexural Properties of Fiber Reinforced Pultruded Plastic Rods, Standard Test Method for Curing Properties of Pultrusion Resins by Thermal Analysis, Standard Test Method for Dye Penetration of Solid Fiberglass Reinforced Pultruded Stock, Standard Test Method for Determination of Reactivity of Unsaturated Polyesters and Vinyl Esters at 180.0°F (82.2°C), Standard Practice for Testing Pultruded Composites, Standard Practice for Freeze/Thaw Conditioning of Pultruded Fiber Reinforced Polymer (FRP) Composites Used in Structural Designs, Standard Practice for Elevated Temperature and Moisture Conditioning of Pultruded Fiber Reinforced Polymer (FRP) Composites Used in Structural Designs, Standard Test Methods for Determining the Full Section Flexural Modulus and Bending Strength of Fiber Reinforced Polymer Crossarms Assembled with Center Mount Brackets, Standard Test Method for Determining Flexural Modulus of Full Section Pultruded Fiber Reinforced Polymer (FRP) Composite Members with Doubly Symmetric Cross Sections under Bending, Standard Practice for Determining Chemical Resistance of Thermosetting Resins Used in Glass-Fiber-Reinforced Structures Intended for Liquid Service, Standard Specification for Contact-Molded Reinforced Thermosetting Plastic (RTP) Laminates for Corrosion-Resistant Equipment, Standard Test Method for Longitudinal Tensile Properties of “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe and Tube, Standard Test Method for Cyclic Pressure Strength of Reinforced, Thermosetting Plastic Pipe, Standard Specification for Reinforced Epoxy Resin Gas Pressure Pipe and Fittings, Standard Test Method for External Pressure Resistance of “Fiberglass”, Standard Test Method for Beam Deflection of “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Pipe Under Full Bore Flow, Standard Practice for Obtaining Hydrostatic or Pressure Design Basis for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe and Fittings, Standard Specification for Filament-Wound “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe, Standard Specification for Centrifugally Cast “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe, Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Sewer Pipe, Standard Specification for Filament-Wound Glass-Fiber-Reinforced Thermoset Resin Corrosion-Resistant Tanks, Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pressure Pipe, Standard Practice for Determining Dimensions of “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Pipe and Fittings, Standard Test Method for Chemical Resistance of “Fiberglass” (Glass–Fiber–Reinforced Thermosetting-Resin) Pipe in a Deflected Condition, Standard Specification for Fiberglass (Glass-Fiber-Reinforced Thermosetting-Resin) Manholes and Wetwells, Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Sewer and Industrial Pressure Pipe, Standard Guide for Underground Installation of “Fiberglass” (Glass-Fiber Reinforced Thermosetting-Resin) Pipe, Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe Fittings for Nonpressure Applications, Standard Specification for Contact Molded “Fiberglass” (Glass Fiber Reinforced Thermosetting Resin) Ducts, Standard Specification for Machine Made “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Flanges, Standard Specification for Contact-Molded Glass-Fiber-Reinforced Thermoset Resin Corrosion-Resistant Tanks, Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe Joints Using Flexible Elastomeric Seals, Standard Specification for Fiber-Reinforced Plastic Fans and Blowers, Standard Guide for Design, Fabrication, and Erection of Fiberglass Reinforced (FRP) Plastic Chimney Liners with Coal-Fired Units, Standard Test Method for Long-Term Ring-Bending Strain of “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe, Standard Specification for Contact Molded “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Flanges, Standard Specification for Fiberglass (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe and Pipe Fittings, Adhesive Bonded Joint Type, for Aviation Jet Turbine Fuel Lines, Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pressure Pipe Fittings, Standard Specification for Contact-Molded “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Corrosion Resistant Pipe and Fittings, Standard Specification for Polymer Concrete Pipe, Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics, Standard Practice for Determining Surface Temperature of Molds for Plastics, Standard Practice for Transfer Molding Test Specimens of Thermosetting Compounds, Standard Practice for In-Line Screw-Injection Molding Test Specimens From Thermosetting Compounds, Standard Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials, Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets, Standard Practice for Compression Molding Test Specimens of Thermosetting Molding Compounds, Standard Test Method for Measuring Shrinkage from Mold Dimensions of Molded Thermosetting Plastics, Standard Terminology Relating to Plastics, Standard Terminology for Abbreviated Terms Relating to Plastics, Standard Guide for Description of Polymer Pellet Defects, Standard Test Method for Rate of Burning and/or Extent and Time of Burning of Plastics in a Horizontal Position, Standard Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position, Standard Test Method for Coefficient of Linear Thermal Expansion of Plastics Between −30°C and 30°C with a Vitreous Silica Dilatometer, Standard Test Method for Molding Index of Thermosetting Molding Powder, Standard Test Method for Brittleness Temperature of Plastics and Elastomers by Impact, Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer, Standard Test Method for Vicat Softening Temperature of Plastics, Standard Test Method for Brittleness Temperature of Plastic Sheeting by Impact, Standard Test Method for Determining Ignition Temperature of Plastics, Standard Test Method for Density of Smoke from the Burning or Decomposition of Plastics, Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index), Standard Test Method for Flame Height, Time of Burning, and Loss of Mass of Rigid Thermoset Cellular Plastics in a Vertical Position, Standard Test Method for Spiral Flow of Low-Pressure Thermosetting Molding Compounds, Standard Test Method for Flow Rates for Poly(Vinyl Chloride) with Molecular Structural Implications, Standard Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of Polymers by Differential Scanning Calorimetry, Standard Test Method for Surface Flammability of Flexible Cellular Materials Using a Radiant Heat Energy Source, Standard Test Method for Thermal Flow, Cure, and Behavior Properties of Pourable Thermosetting Materials by Torque Rheometer, Standard Test Method for Measuring the Comparative Burning Characteristics of Solid Plastics in a Vertical Position, Standard Test Method for Determination of Properties of Polymeric Materials by Means of a Capillary Rheometer, Standard Test Method for Oxidative-Induction Time of Polyolefins by Differential Scanning Calorimetry, Standard Test Method for Determining the Flammability Characteristics of Nonrigid Solid Plastics, Standard Test Method for Horizontal Burning Characteristics of Cellular Polymeric Materials, Standard Specification for Laboratory Burner Used for Small-Scale Burning Tests on Plastic Materials, Standard Test Method for Measuring the Comparative Burning Characteristics and Resistance to Burn-Through of Solid Plastics Using a 125-mm Flame, Standard Test Method for Horizontal Burning Rate of Polymeric Materials Used in Occupant Compartments of Motor Vehicles, Standard Practice for Confirmation of 20-mm (50-W) and 125-mm (500-W) Test Flames for Small-Scale Burning Tests on Plastic Materials, Standard Test Method for Measurement of Properties of Thermoplastic Materials by Screw-Extrusion Capillary Rheometer, Standard Test Method for Thermal Conductivity of Plastics by Means of a Transient Line-Source Technique, Standard Test Method for Determining Flammability Characteristics of Plastics and Other Solid Materials Using Microscale Combustion Calorimetry, Standard Classification System and Basis for Specifications for Cellulose Acetate Molding and Extrusion Compounds (CA), Standard Classification System and Basis for Specification for Cellulose Acetate Butyrate Molding and Extrusion Compounds (CAB), Standard Specification for Ethyl Cellulose Molding and Extrusion Compounds, Standard Classification System for Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion Compounds, Standard Test Method for Determination of Relative Viscosity of Concentrated Polyamide (PA) Solutions, Standard Test Methods for Sampling and Testing Plasticizers Used in Plastics, Standard Test Methods for Volatile Loss From Plastics Using Activated Carbon Methods, Standard Test Method for Dilute Solution Viscosity of Vinyl Chloride Polymers, Standard Specification for Polyethylene Plastics Extrusion Materials for Wire and Cable, Standard Classification System for Polychlorotrifluoroethylene (PCTFE) Plastics, Standard Classification System and Basis for Specification for Cellulose Acetate Propionate Molding and Extrusion Compounds (CAP), Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics, Standard Specification for Extruded Polytetrafluoroethylene (PTFE) Rod, Heavy Walled Tubing and Basic Shapes, Standard Specification for Poly(Vinyl Chloride) Resins, Standard Classification System and Basis for Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds, Standard Test Method for Apparent Viscosity of Plastisols and Organosols at High Shear Rates by Extrusion Viscometer, Standard Test Method for Apparent Viscosity of Plastisols and Organosols at Low Shear Rates, Standard Practice for Oven Heat Stability of Poly(Vinyl Chloride) Compositions, Standard Specification for FEP Resin Molding and Extrusion Materials, Standard Test Method for Folding Endurance of Paper and Plastics Film by the M.I.T.
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