Plastic sealing bag inspection service

Plastic Sealing Bag Inspection Service – Accredited Testing for Quality, Safety and Compliance Across Global Markets

Our internationally accredited laboratory delivers a specialist plastic sealing bag inspection service that empowers manufacturers of flexible packaging, food processors, medical‑device packagers, logistics providers and consumer‑goods brands worldwide to independently verify the mechanical strength, seal integrity, barrier performance, chemical safety and long‑term durability of their heat‑sealed, adhesive‑closed and zipper‑lock bags. Every test is conducted under the rigorous framework of ISO/IEC 17025, and each report bearing the ILAC mark is unconditionally accepted by regulatory authorities, notified bodies and supply‑chain partners in all major economies. The plastic sealing bag inspection service subjects the complete package and its constituent films, closures and seals to a comprehensive suite of physical, mechanical, barrier, chemical and environmental‑ageing evaluations, quantifying the tensile strength and the elongation, the heat‑seal and the peel strength, the oxygen and the water‑vapour transmission rate, the leak and the burst resistance, the migration of the potentially harmful substances into the food simulants, and the resistance to the UV‑radiation, the humidity and the thermal cycling. For a food manufacturer certifying a retort pouch to the EU and the FDA standards, a medical‑device producer validating a sterile‑barrier pouch to the ISO 11607‑1, or an importer verifying the conformance of a batch of zipper bags to the ASTM F2095 and the EN 13477 specifications, this service provides the legally robust, defensible data that underpin product certification, shelf‑life validation and the protection of the consumer and the patient.

Product Samples We Regularly Inspect in Our Plastic Sealing Bag Testing Programme

Our tensile‑test frames, seal‑strength analysers, gas‑permeation instruments, leak‑detection systems, migration‑test cells and environmental‑ageing chambers accommodate an extraordinarily diverse range of plastic sealing bag constructions and their closure systems. The following categories represent the most frequently tested items:

Food‑contact and the food‑packaging plastic bags – the polyethylene, the polypropylene, the polyester, the polyamide and the multi‑layer laminated bags for the fresh produce, the frozen foods, the snacks, the cereals, the bakery products, the liquids and the retort‑sterilised ready‑meals
Medical‑device and the pharmaceutical‑grade sealing bags – the sterile‑barrier pouches, the header‑bags, the form‑fill‑seal packs and the peel‑open overwraps, made from the medical‑grade paper‑to‑film, the Tyvek‑to‑film and the all‑film laminates, for the containment and the sterilisation of the implants, the surgical kits and the diagnostic devices
Heavy‑duty and the industrial plastic bags – the gusseted, the flat and the tubular bags for the bulk chemicals, the fertilisers, the resins, the mineral powders and the construction materials, evaluated for the drop‑impact, the tear‑propagation and the stacking‑strength
Zipper‑lock, the slider‑closure and the reclosable bags – the consumer‑storage, the freezer and the sous‑vide bags with the integral press‑to‑close or the slider‑type zipper, tested for the closure‑integrity, the repeated‑opening‑and‑closing endurance and the resistance to the leakage
Stand‑up pouches and the shaped‑seal bags – the pre‑formed pouches with the bottom‑gusset, the spout‑fitment and the contoured seal profiles, used for the beverages, the liquid detergents, the pet‑food and the personal‑care products
Vacuum and the modified‑atmosphere‑packaging bags – the high‑barrier laminates that are evacuated or back‑flushed with the nitrogen or the carbon dioxide, evaluated for the gas‑retention, the seal‑creep and the puncture‑resistance during the extended chilled storage
Returnable and the reusable plastic sealing bags – the thicker‑gauge, the multi‑use bags for the e‑commerce delivery, the garment‑storage and the industrial‑parts handling, tested for the flex‑crack resistance, the abrasion and the seal‑fatigue after the repeated opening and the resealing
Aged, field‑retrieved and the accelerated‑weathering‑exposed plastic bag samples – the specimens that have been subjected to the thermal‑cycling, the UV‑radiation or the long‑term shelf‑storage, submitted for the residual‑property assessment and the failure‑mode analysis

Mechanical Strength and Durability Testing of Plastic Sealing Bags According to ASTM D882, ISO 527‑3 and ASTM D1709

Determination of the tensile strength, the elongation at break and the Young's modulus of the film and the complete bag by the strip and the grab methods according to ASTM D882 (Standard Test Method for Tensile Properties of Thin Plastic Sheeting) and ISO 527‑3 (Plastics – Determination of tensile properties – Part 3: Test conditions for films and sheets): a specimen of the bag wall is cut in the machine direction and the transverse direction and pulled at a constant crosshead speed. The yield strength, the ultimate tensile strength and the percentage elongation are reported, providing the fundamental mechanical data that the packaging‑engineer uses to guarantee the bag's resistance to the filling‑head pressure, the drop‑impact and the stacking load. This plastic sealing bag inspection service verifies that the film meets the minimum strength specification for the intended application.
Dart‑drop impact and the slow‑rate puncture resistance according to ASTM D1709 (Standard Test Methods for Impact Resistance of Plastic Film by the Free‑Falling Dart Method) and ASTM D5748 (Standard Test Method for Protrusion Puncture Resistance of Stretch Wrap Film): a hemispherical‑headed dart is dropped from a specified height onto the bag film, or a probe is driven through the film at a constant speed, and the energy or the force that causes the failure is recorded, quantifying the bag's ability to withstand the sharp‑object penetration and the rough handling during the transport and the distribution.
Elmendorf tear resistance and the trouser‑tear propagation according to ASTM D1922 (Standard Test Method for Propagation Tear Resistance of Plastic Film and Thin Sheeting by Pendulum Method) and ASTM D1938 (Standard Test Method for Tear‑Propagation Resistance of Plastic Film and Thin Sheeting by a Single‑Tear Method): a pre‑cut notch is propagated through the bag film, and the force required to continue the tear is measured, providing the data that the designer uses to ensure that a small puncture or a nick at the seal‑edge does not propagate into a catastrophic rupture.
Flex‑crack and the Gelbo‑flex resistance according to ASTM F392 (Standard Test Method for Flex Durability of Flexible Barrier Materials): the bag film is repeatedly twisted and flexed through a defined cycle, and the formation of the pinholes and the cracks is monitored, predicting the bag's ability to survive the repetitive mechanical stresses during the form‑fill‑seal, the transport‑vibration and the consumer handling.

Heat Seal Integrity and Seal Strength Evaluation – Core of the Plastic Sealing Bag Inspection Service

Determination of the heat‑seal strength and the peel‑seal behaviour according to ASTM F88 (Standard Test Method for Seal Strength of Flexible Barrier Materials) and EN 868‑5 (Packaging for terminally sterilized medical devices – Part 5: Sealable pouches and reels of porous materials and plastic film construction): a 25 mm‑wide strip that contains the factory‑produced or the laboratory‑produced seal is cut perpendicular to the seal and pulled in a tensile tester at a constant crosshead speed. The maximum force and the average peel force per unit width are reported, and the failure mode – the adhesive‑peel, the cohesive‑film‑rupture or the delamination – is documented. This plastic sealing bag inspection service is the primary quality‑control test that the packaging converter uses to set the sealing‑jaw temperature, the dwell‑time and the pressure for the optimum seal‑strength and the easy‑open characteristic.
Hot‑tack and the heat‑sealability testing according to ASTM F1921 (Standard Test Methods for Hot Seal Strength – Hot Tack and Heatsealability of Thermoplastic Polymers and Blends): the film is sealed and immediately peeled while the seal is still hot, measuring the force that the seal can support before it cools, which is the critical parameter for the vertical‑form‑fill‑seal operations where the product is dropped into the bag immediately after the sealing.
Burst and the creep‑to‑failure testing of the complete sealed bag according to ASTM F1140 (Standard Test Methods for Internal Pressurization Failure Resistance of Unrestrained Packages) and ASTM F2054 (Standard Test Method for Burst Testing of Flexible Package Seals Using Internal Air Pressurization Within Restraining Plates): the bag is internally pressurised with the air or the water, and the pressure at which the seal or the body of the bag ruptures is recorded, providing the direct, system‑level validation of the bag's ability to withstand the filling, the retort‑processing and the altitude‑induced pressure differentials.
Seal‑integrity after the sterilisation and the thermal‑cycling – the steam, the ethylene‑oxide, the gamma‑radiation and the electron‑beam exposure: the sealed bag is subjected to the defined sterilisation cycle or the thermal‑cycling sequence, and the post‑exposure seal‑strength, the burst‑pressure and the visual integrity are measured, certifying that the sterile‑barrier system maintains its hermeticity throughout the sterilisation and the distribution.

Barrier Properties and Shelf‑Life Prediction – Plastic Sealing Bag Inspection According to ASTM F1249, ASTM D3985 and ASTM E96

Determination of the water‑vapour transmission rate by the modulated‑infrared‑sensor method according to ASTM F1249 (Standard Test Method for Water Vapor Transmission Rate Through Plastic Film and Sheeting Using a Modulated Infrared Sensor) and ASTM E96 (Standard Test Methods for Water Vapor Transmission of Materials): the bag film is clamped in a diffusion cell, and the steady‑state WVTR in the grams per square metre per day is reported, providing the critical moisture‑barrier data that the food‑technologist uses to calculate the shelf‑life of the moisture‑sensitive snack, the biscuit and the powdered‑beverage product.
Oxygen‑transmission rate by the coulometric sensor method according to ASTM D3985 (Standard Test Method for Oxygen Gas Transmission Rate Through Plastic Film and Sheeting Using a Coulometric Sensor) and ISO 15105‑2: the film is mounted in a permeation cell, and the oxygen that diffuses through the film is detected by a coulometric sensor, yielding the OTR in the cubic centimetres per square metre per day. This plastic sealing bag inspection service is mandatory for the qualification of the barrier laminates that protect the oxygen‑sensitive coffee, the nuts, the processed‑meat and the pharmaceutical products from the oxidative degradation.
Carbon‑dioxide and the nitrogen transmission rates for the modified‑atmosphere‑packaging applications: the transmission rate of the CO₂ or the N₂ is measured by a gas‑chromatographic or a manometric method, supporting the design of the controlled‑atmosphere package for the fresh produce, the meat and the cheese.
Whole‑bag oxygen and the water‑vapour ingress testing according to ASTM F1307 (Standard Test Method for Oxygen Transmission Rate Through Dry Packages Using a Coulometric Sensor) and the internal procedures: the complete, sealed bag is attached to the permeation analyser, and the total‑oxygen or the moisture ingress through the bag walls, the seal and the closure is measured, providing the most direct, application‑relevant barrier‑performance data that includes the contributions of every component of the package.

Seal Leak Detection and Package Integrity Testing – Plastic Sealing Bag Inspection Service for Hermeticity and Sterility Assurance

Bubble‑emission and the vacuum‑leak testing according to ASTM D3078 (Standard Test Method for Determination of Leaks in Flexible Packaging by Bubble Emission) and ASTM F2096 (Standard Test Method for Detecting Gross Leaks in Packaging by Internal Pressurization – Bubble Test): the sealed bag is submerged in a water‑filled chamber, and a vacuum is applied or the bag is internally pressurised, and the formation of the continuous‑stream bubbles from the seal, the pinhole or the puncture is visually detected, providing the rapid, production‑line acceptance test for the gross‑leak detection.
Pressure‑decay and the vacuum‑decay leak testing according to ASTM F2338 (Standard Test Method for Nondestructive Detection of Leaks in Packages by Vacuum Decay Method) and the internal procedures: the bag is placed in a sealed test chamber that is evacuated or pressurised, and the rate of the pressure change is measured by a high‑precision transducer, detecting the micro‑leaks that are invisible to the bubble‑emission method and providing the quantitative leak‑rate data in the standard cubic centimetres per minute.
Helium‑mass‑spectrometer leak detection and the trace‑gas sniffer testing according to ASTM F2391 (Standard Test Method for Measuring Package and Seal Integrity Using Helium as the Tracer Gas) and the internal procedures: the bag is filled with a helium‑containing gas mixture, and the helium that escapes through the seal or the pinhole is detected by a mass‑spectrometer sniffer, achieving the detection limit as low as 10⁻⁶ mbar·L/s, which is the mandatory method for the certification of the sterile‑barrier pouches and the pharmaceutical‑blister packs. This plastic sealing bag inspection service is required by the ISO 11607‑1 for the validation of the medical‑device packaging.
Dye‑penetration and the seal‑groove leak testing according to ASTM F3039 (Standard Test Method for Detecting Leaks in Nonporous Packaging or Flexible Barrier Materials by Dye Penetration) and the internal procedures: a low‑surface‑tension dye solution is applied to the seal area, and the penetration of the dye through the seal‑channel is visually inspected, revealing the capillary‑leak paths that are the most common failure mode of the heat‑sealed bags.

Food Contact Compliance and Migration Testing – Plastic Sealing Bag Inspection According to EU 10/2011, FDA 21 CFR and the Pharmacopoeial Methods

Determination of the overall migration into the food simulants according to the Commission Regulation (EU) No 10/2011 (on plastic materials and articles intended to come into contact with food) and the EN 1186 series: the plastic sealing bag is exposed to the aqueous, the acidic, the alcoholic and the fatty‑food simulants under the standardised time‑and‑temperature conditions that represent the intended use, and the total mass of the non‑volatile substances that migrate into the simulant is gravimetrically determined and reported in the milligrams per square decimetre. The result must be below the statutory limit of 10 mg/dm², and the test is the primary regulatory‑compliance requirement for every food‑contact plastic bag that is placed on the European market.
Specific migration of the restricted substances – the primary aromatic amines, the phthalates, the bisphenol A, the heavy metals and the specific additives – by the liquid chromatography–tandem mass spectrometry and the inductively coupled plasma mass spectrometry according to the EN 13130 and the FDA 21 CFR § 175‑§ 178: the bag is extracted, and the concentration of each regulated substance in the simulant is measured and compared with the specific migration limit, providing the essential chemical‑safety data for the product‑registration dossier.
Organoleptic and the sensory‑taint testing according to the EN 1230‑1 (Paper and board intended to come into contact with foodstuffs – Sensory analysis – Part 1: Odour) and the DIN 10955 (Sensory analysis – Testing of packaging materials and packages for foodstuffs): a trained sensory panel evaluates the odour and the taste of the food simulant that has been in contact with the plastic sealing bag, and any detectable off‑flavour or off‑odour is reported, ensuring that the bag does not impart an unacceptable taint to the packaged food.
Residual‑solvent and the volatile‑organic‑compound content by the headspace gas chromatography–mass spectrometry according to the internal validated protocol and the principles of the USP ⟨467⟩ (Residual Solvents): the bag is heated in a sealed vial, and the concentration of the residual printing‑ink solvents, the lamination‑adhesive volatiles and the polymer‑degradation products is reported, verifying that the bag is safe for the direct food contact and the pharmaceutical use.

Environmental Stress, Accelerated Aging and Weathering – Plastic Sealing Bag Inspection Service for Long‑Term Performance

Accelerated weathering and the UV‑radiation resistance according to ASTM G154 (Standard Practice for Operating Fluorescent Ultraviolet Lamp Apparatus for Exposure of Non‑Metallic Materials) and ISO 4892‑2: the plastic sealing bag is exposed to a cycle of the UV‑A or the UV‑B radiation, the heat and the condensation, and the colour‑change, the tensile‑strength retention and the surface‑cracking are evaluated, predicting the outdoor‑storage and the exposed‑service life of the bag in the retail and the agricultural applications.
Thermal‑shock and the freeze‑thaw cycling according to the internal procedures and the relevant clauses of the ASTM D4332 (Standard Practice for Conditioning Containers, Packages, or Packaging Components for Testing): the sealed bag is cycled between -20 °C and +50 °C, and the post‑cycling seal‑strength, the barrier‑property and the visual integrity are measured, ensuring that the bag can survive the frozen‑food distribution and the tropical‑warehouse storage without the seal‑failure or the film‑embrittlement.
Resistance to the chemical agents – the oils, the greases, the detergents and the disinfectants – according to ASTM D543 (Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents) and the internal procedures: the bag is exposed to the representative household and the industrial chemicals, and the change in the mass, the tensile properties and the seal‑strength is reported, certifying the compatibility of the bag with the packaged product and the cleaning‑spills.
Real‑time and the accelerated shelf‑life testing according to the ASTM F1980 (Standard Guide for Accelerated Aging of Sterile Barrier Systems for Medical Devices) and the internal protocols: the filled and the sealed bags are stored under the controlled temperature and the humidity, and the critical performance parameters are measured at the pre‑defined time‑points, providing the data for the determination of the expiration‑date and the shelf‑life of the packaged product.

Report Acceptance and Global Regulatory Compliance

All measurements performed within our plastic sealing bag inspection service are executed under the fully accredited scope of our ISO/IEC 17025 quality management system. Each test report that carries the ILAC mark is therefore automatically recognised by regulatory authorities, notified bodies, customs offices and supply‑chain partners in all major economies. For flexible‑packaging converters, food‑processing companies, medical‑device manufacturers and industrial‑bag importers anywhere in the world, the report constitutes legally robust, internationally accepted evidence that the mechanical strength, the seal‑integrity, the barrier properties, the chemical‑migration safety and the long‑term durability of the plastic sealing bag have been determined in accordance with the applicable ASTM, ISO, EN, FDA and customer‑specified methods. The documentation can be directly used to support the CE marking under the EU Packaging and Packaging Waste Directive or the Medical Device Regulation, the FDA 510(k) clearance, the food‑contact compliance declaration, the issue of inspection certificates according to EN 10204 or equivalent national standards, and the resolution of commercial and technical disputes concerning the quality, the safety and the performance of any plastic sealing bag product.