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Jiangsu Adhesive Package International Co., Ltd.

JAPI is a high-tech enterprise committed to the development and production of two-component products, including mixing tubes and related items.Our comprehensive range of products finds widespread application across various sectors, including home improvement building materials, electronic adhesives, spraying, and automobile sealing.we focus on market demands and continuous development. We look forward to building long-term, mutually beneficial partnerships worldwide.

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Trust Seal, Credit Check, RoSH and Supplier Capability Assessment. company has strictly quality control system and professional test lab.

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Internal professional design team and advanced machinery workshop. We can cooperate to develop the products you need.

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Advanced automatic machines, strictly process control system. We can manufacture all the Electrical terminals beyond your demand.

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How to Choose the Right AB Cartridge: Mix Ratio, Capacity and Material

A two-component adhesive is only as good as the package it arrives in. The cartridge is not a bottle: it is a volumetric metering device. Its two chambers, its pistons and its outlet together decide how much resin and how much hardener reach the static mixer on every stroke of the gun. When a bond cures soft, leaks in transit or blocks a nozzle, the cause is often the packaging rather than the chemistry. This guide covers the four decisions that shape a cartridge order - mix ratio, capacity, material and the mechanical details most buyers never see - and closes with a specification routine and the questions worth asking before a sample is approved. Key takeaways The mix ratio is volumetric and fixed by chamber geometry; the gun only supplies force. Size the cartridge from bead cross-section and run length, then add a purge allowance. PP covers most 1:1 and 2:1 work; PBT is the usual choice for slim high-ratio chambers; PA suits aggressive solvents. Wall thickness, piston design, outlet interface and cap quality decide whether a cartridge survives pressure and transport. 1. Why the ratio comes before everything else Every 2K cartridge is built around a fixed volumetric ratio: 1:1, 2:1, 3:1, 4:1 or 10:1. The ratio is not set by the gun or by the operator. It is set by the cross-sectional area of each chamber and by the fact that both pistons are advanced by the same plunger or push-rod pair. If chamber A has twice the area of chamber B, the cartridge delivers twice the volume, on every stroke, without adjustment. That is also why the established industrial systems are organised by ratio and geometry rather than by brand name. The Sulzer Mixpac side-by-side C- and J-Systems cover 235 mL to 1500 mL in 1:1, 2:1, 3:1, 4:1 and 10:1, while its coaxial Q-System is built around 10:1 in 150, 310 and 380 mL. The choice between side-by-side and coaxial is really a choice about how to package a small B fraction: a 10:1 side-by-side cartridge needs a very slim hardener chamber, whereas a coaxial design places the hardener in an inner tube and keeps the outer body round and pressure-resistant. One warning that costs real money: confirm whether your adhesive's ratio is specified by volume or by weight. Resin and hardener rarely share the same density, so a formulation quoted 1:1 by weight is not 1:1 by volume. Filling a volumetric cartridge to a weight-based ratio shifts the mix before the product has even left the plant. Table 1. Standard mix ratios and how they are usually packaged Ratio Chamber geometry Typical chemistry Common pack sizes 1:1 Two equal chambers, side by side Epoxy, polyurethane, silicone, acrylic 50-600 mL 2:1 A twice the section of B Structural epoxy, PU 50-400 mL 3:1 A three times the section of B Construction and composite systems 365-585 mL 4:1 A four times the section of B Potting compounds, PU 200-600 mL 10:1 Slim B chamber, or a coaxial inner tube Chemical anchoring, low-hardener structural systems 75-490 mL 2. Match capacity to the job, not to the price list Capacity is usually chosen by habit, or by unit price. A more reliable method is to calculate the bead. For a triangular bead the cross-section is about 0.433 times the square of the width, so a 6 mm bead carries roughly 15.6 mm2 of adhesive - close to 15.6 mL per metre of run. A 400 mL cartridge, allowing a few millilitres of purge, therefore gives about 24 to 25 m of 6 mm bead. The same arithmetic shows that a 50 mL cartridge is a repair tool at roughly 3 m, while a 600 mL cartridge is a production tool at roughly 38 m. Capacity carries two hidden costs as well. The first is dead volume: at every cartridge change the mixer and outlet hold adhesive that will never be used, and that penalty is proportionally larger on small packs. The second is shelf life after opening. A capped cartridge can be stored and reused, but each opening exposes the material to air and moisture, so a two-week job does not always need the largest pack on the list. Table 2. Approximate bead length per cartridge (6 mm triangular bead, before purge) Nominal capacity Approx. 6 mm bead Typical use Usual dispensing 50 mL ~3 m Repair, sample kits, small assembly Manual 75 mL ~4.5 m Precision assembly, small batches Manual 200 mL ~12 m General bonding, electronics Manual or pneumatic 250 mL ~16 m Anchoring and 10:1 structural work Manual or pneumatic 400 mL ~25 m Structural bonding, mid-volume lines Manual or pneumatic 490 mL ~31 m High-ratio structural and anchoring Pneumatic 600 mL ~38 m Production bonding, long runs Pneumatic 1500 mL ~95 m Bulk dispensing, meter-mix feed Pneumatic or meter-mix 3. Material: PP, PBT and PA are not interchangeable Three thermoplastics dominate 2K cartridge barrels, and the difference appears under pressure rather than on a datasheet. PP (polypropylene). The default for 1:1 and 2:1 cartridges. Good resistance to most epoxy, PU and silicone systems, easy to mould, lowest cost. Its weakness is stiffness: thin PP walls deflect under load. PBT (polybutylene terephthalate). Higher stiffness and much better dimensional stability, with low moisture uptake. On a 10:1 cartridge the hardener chamber is small and thin, so keeping that section round under pressure is exactly what protects the ratio, which is why high-ratio cartridges are commonly moulded in PBT. PA (polyamide, nylon). The best choice against aggressive solvents and for moisture-sensitive fills, because it forms a tighter barrier. It is also hygroscopic, so PA cartridges must be stored dry and sealed. PE and LDPE. Not a barrel material. These are the standard grades for pistons, where a softer, self-lubricating polymer seals better against the bore. Table 3. Barrel material selection Material Stiffness Solvent resistance Moisture sensitivity Best fit PP Moderate Good for common epoxy, PU and silicone Low 1:1, 2:1 and 3:1 general purpose PBT High Good Low 10:1 and other slim-chamber, high-pressure work PA Moderate to high Very good High (hygroscopic) Solvent-rich fills, long shelf-life barrier 4. The parts you cannot see in a product photo Two cartridges can look identical in a catalogue and behave completely differently in the field. Four features account for most of that gap. Wall thickness and ribbing. Thin, unribbed cartridges deflect as the pistons advance; when chamber A deflects more than chamber B, the delivered ratio drifts rich in resin and the adhesive cures soft or tacky. Reinforced walls, typically 1.2 to 1.5 mm with ribs between the chambers, hold their section at working pressure. Piston design. A wiper-lip piston scrapes the bore clean, which reduces dripping and prevents a film of cured material behind the piston. Vented pistons are the other half of the story: they let air escape during filling instead of trapping it under the piston. Outlet interface. Bell-mouth with a retaining nut, coarse thread with an O-ring, or bayonet and interlock: each family has a different sealing surface and its own pressure ceiling. The interface must match the series of the mixer already on your shelf, not merely the ratio. Caps. A good tip cap has a knurled grip and a vent so it can be fitted without pressurising the cartridge; an end cap needs a precision fit and a positive seal. Cheap caps are the most common reason a cartridge leaks in a container rather than on a job site. 5. A six-step specification routine 1. Read the TDS and write down the ratio, and whether it is expressed by volume or by weight. 2. Screen the chemistry against the barrel material: solvents, acidity, amine content and filler loading all matter. 3. Calculate total volume from bead cross-section times run length, then add 5 to 10 percent for purge. 4. Set the pressure class from the dispensing method; manual guns are gentle, pneumatic guns and meter-mix lines are not. 5. Lock the outlet interface to the mixer family already in stock, or plan to change both together. 6. Check the filling and logistics side: nozzle or plug configuration, case pack, pallet pattern and container utilisation. 6. Before you approve a sample, ask for these A dimensional report covering bore diameter, wall thickness and chamber depth, not only overall height. A ratio verification, ideally by dispensing A and B separately into tared cups and comparing the mass ratio with the density ratio. Leak test data. A 48-hour water-fill test on every mould, as JAPI runs in-house, is a practical benchmark. A drop test and a transport trial, because the most expensive failure happens between the filling line and the customer's shelf. Batch traceability and a retained sample, so a complaint can be traced back to a mould and a material lot. JAPI moulds PP, PBT and PA cartridges from 30 mL to 1500 mL in 1:1, 2:1, 3:1, 4:1 and 10:1, and supplies the matching static mixers as one system, which is the simplest way to avoid an interface mismatch. For a closer look at how the gun side of the system works, see our article on how adhesive dispensing guns work. Specifying a new 2K pack? Send us the adhesive TDS, the target fill volume and the gun you intend to use. JAPI will match cartridge, piston and mixer as one set, and send filled samples for a line trial.

2026-03-19

PA Material Adhesive Cartridge: A Comprehensive Guide to High-Performance Packaging-3

III. Extensive Capacity Range: PA Cartridges for Every Application Scale To meet the diverse needs of professionals and hobbyists alike, PA material adhesive cartridges are available in an extensive spectrum of capacities, from micro-sized precision cartridges to large-volume industrial options. Each capacity is designed to optimize material usage and application efficiency: 1. Micro/Small Capacities (1ml – 50ml) Ideal for precision work, small-scale projects, and medical/dental applications, these compact PA cartridges offer unmatched control and minimal waste. · Key Sizes & Uses: o 1ml, 2ml, 5ml: Primarily dental cartridge for dental bonding, fillings, and orthodontic applications. Their small size allows for precise, micro-dispensing in tight oral spaces. o 10ml, 30ml, 50ml: Perfect for small DIY projects, small-batch silicone sealant application, and AB adhesive repairs. These empty cartridge are lightweight, easy to handle, and compatible with manual precision glue guns. 2. Medium Capacities (100ml – 400ml) The most versatile range, designed for general construction, automotive repairs, and medium-scale industrial applications. These PA cartridges balance capacity and portability, making them a staple for on-site work and workshop production. · Key Sizes & Uses: o 100ml, 200ml: Common for two-component AB adhesives, small epoxy projects, and silicone sealant for residential repairs. Compatible with both manual and pneumatic glue guns, they are ideal for contractors and handymen. o 300ml, 400ml: The industry standard for medium-volume adhesive packaging. Used for large epoxy bonding jobs, automotive structural repairs, and commercial sealant applications. PA’s strength ensures these dual barrel cartridges perform flawlessly even at maximum capacity. 3. Large Capacities (500ml – 2L+) Engineered for industrial mass production, high-volume construction projects, and automated dispensing systems. These large PA cartridges reduce downtime by minimizing cartridge changes and supporting continuous adhesive flow. · Key Sizes & Uses: o 500ml, 1L: Designed for industrial epoxy packaging, large-scale silicone sealant projects (e.g., building facade sealing), and bulk two-component adhesive applications. Fully compatible with automated dispensing systems, they boost production efficiency. 2L and above: Custom-sized PA empty cartridge for heavy-duty industrial use, such as manufacturing line bonding and large-scale infrastructure projects. The double cartridge design (dual barrel) ensures consistent mixing of large volumes of two-component adhesives, maintaining the highest bond quality. IV. Additional Key Features and Industry Compliance Beyond material performance and compatibility, PA adhesive cartridges are engineered to meet strict industry standards, ensuring reliability and safety across all applications: · Disposable and Hygienic: All PA-based Disposable Cartridge, Disposable Dual Glue Cartridge, and dental cartridge are manufactured to be sterile and single-use, eliminating cross-contamination risks and reducing cleanup time. · Customizable Designs: PA cartridges can be customized with different nozzle types, ratio options (for dual-chamber cartridges), and color coding to match specific adhesive brands and applications. · Eco-Friendly Options: Food-grade and recyclable PA materials are available, aligning with global sustainability goals while maintaining performance. · Global Certifications: PA adhesive cartridges comply with ISO, CE, and FDA certifications (for medical/dental use), ensuring they meet international quality and safety standards. In summary, PA material adhesive cartridges are the ultimate packaging solution for modern adhesive applications. From the precision of dental cartridge to the scale of industrial epoxy packaging, PA’s unbeatable chemical resistance, durability, and compatibility make it the superior choice over PP. Whether you need a small empty silicone cartridge for a DIY project or a large dual barrel epoxy cartridge for mass production, PA-based adhesive cartridges deliver consistent performance, minimal waste, and peace of mind.

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