How to specify injection moulding gloves for hot sprues, sharp plastic flash, mould-release oil and packing work, with EN388, EN407, gauge, coating, MOQ and inspection realities from a glove factory.
The Practical Spec Most Moulding Lines Start With
For most injection moulding gloves, the sensible first trial is not a thick heat glove. It is usually a 13 gauge or 15 gauge cut-resistant liner with a sandy nitrile palm, marked to EN388:2016+A1:2018 around 4X42B, 4X43C or 4X43D depending on yarn and coating weight. That one construction covers three common moulding jobs: taking warm ABS, PP, PC or PA parts from the press, trimming gates and flash, and gripping parts with silicone, wax or oil-based mould-release residue. A normal press-side spec might be 13 gauge HPPE-polyester-glass-spandex liner, black sandy nitrile palm, knitted wrist, EN388 target 4X43C, and optional EN407:2020 X1XXXX for short contact with warm runners. EN407 contact heat level 1 is tested at 100 °C for at least 15 seconds in the lab. It does not mean an operator can hold a hot sprue continuously through an 8-hour shift. If runners or inserts are regularly above 100 °C, ask for EN407 data and run a real line trial with measured contact time. Our factory can knit 13 gauge and 15 gauge seamless liners, dip nitrile, PU or latex coatings, add heat-transfer or screen-printed logos, and pack by 12-pair polybag, single pair polybag, vending pack or retail header card. We do not manufacture disposable nitrile examination gloves. We also do not make aluminised foundry gloves, welding gauntlets or gloves for molten plastic purging. Barrel purging, heater-band maintenance and hot-tool changeover need a different heat-risk specification.
Split the Line by Task, Not Job Title
A moulding plant often asks for one glove for operators, but the risk changes every few metres. At the injection press, the glove needs oily grip, moderate cut resistance and limited contact heat. At the trimming bench, the main problem is sharp flash, gate knives and puncture. At final inspection and packing, the glove must be clean, flexible and low-marking. One glove can sometimes cover press and trimming, but it rarely suits glossy packing work as well. For trimming PP and ABS flash, EN388 cut level B or C is a practical starting point. For glass-filled nylon, sharp PC edges, acetal gears or parts with thin ribs, ask for level C or D and check puncture rating as well. If your market uses North American markings, ANSI/ISEA 105-2016 or ANSI/ISEA 105-2024 cut A2 to A4 is common for light-to-medium plastics trimming. Do not compare an old EN388 4543 marking directly with a new 4X43C or 4X43D. The old Coup test and the newer ISO 13997 TDM letter rating are not the same measurement. For packing white ABS housings, clear PC covers or glossy appliance trim, a black sandy nitrile palm can leave rub marks, especially when the coating is new or the part is still warm. A 15 gauge grey nylon or polyester liner with grey PU palm gives better fingertip feel and lower marking risk. The trade-off is oil grip. PU is poor on silicone release agent and hydraulic mist, so many plastics plants end up with two SKUs: a nitrile-coated cut glove for press and trimming, and a PU inspection glove for clean packing.
Liner, Gauge and Coating Choices That Actually Matter
The liner drives comfort, cut rating and price. HPPE gives a cool hand feel and good cut resistance. Glass fibre helps raise the EN388 cut letter, but it can feel harsh if the covering yarn is poor or the liner is knitted too loose. Polyester improves shape stability and keeps the cost under control. Spandex improves fit, especially around the palm and thumb crotch. A common 13 gauge construction is HPPE, polyester, glass fibre and spandex. For finer handling, 15 gauge feels better, but reaching cut C or D in 15 gauge usually needs more expensive yarn. Coating is not just a catalogue choice. Sandy nitrile grips oily PP crates, mould-release residue and slightly wet parts better than smooth nitrile, flat nitrile or PU. Foam nitrile breathes better because the coating is more open, but sandy nitrile usually wins where operators handle oily moulded parts. PU gives excellent fingertip sensitivity for small clips, terminals and snap-fits, but it loses grip fast around silicone oil. Latex gives strong dry grip, but it is not our first choice for oily plastics lines and some buyers reject it because of latex-allergy policies. Cuff and colour also affect daily acceptance. A 7 cm knitted wrist is standard on most dipped gloves. Some moulding lines ask for 9 cm or longer cuffs to reduce plastic granules entering the glove, but this changes comfort in hot workshops. Black hides oil and carbon-black dust. Grey shows contamination earlier. Blue is useful where gloves must be visually separated from black plastic parts. Pantone-style matching can be attempted for cuff overlock or yarn, but nitrile palm colour has wider tolerance because pigments shift after oven curing.
Heat Claims Need Real Handling Conditions
Hot plastic is awkward because surface temperature drops quickly after ejection, while sprues, metal inserts and thick runners stay hot longer. EN407:2020 is the correct European standard for heat claims. For injection moulding gloves, contact heat level 1 or 2 is usually more realistic than a bulky level 3 construction. Level 2 is tested at 250 °C contact heat for at least 15 seconds, but the test uses a flat hot surface. Pinching a thin runner under pressure can feel hotter and can damage coating faster. Before sampling, collect three numbers from the moulding floor: part temperature at removal, normal contact time in seconds, and what the operator actually grips. Plastic housing, brass insert, steel jig and hot runner all behave differently. Also note whether the part is dry, oily or wet from cooling. A thicker nitrile palm gives more thermal buffer, but it reduces dexterity and can increase dropped parts on small components. A terry cotton heat glove may protect better from warmth, but it is usually clumsy for trimming gates or handling small PA66 clips. We can help arrange third-party EN388 and EN407 testing when a buyer needs reports under their own brand, but the timing and cost must be planned before purchase order. Standard development samples using existing yarn and coating normally take 7 to 10 days. New yarn, colour matching or special packaging can add another 1 to 2 weeks. Laboratory testing often adds 2 to 4 weeks depending on the standard scope and queue. Repeat bulk production is commonly 4 to 6 weeks after deposit, approved artwork and confirmed size ratio, not including sea freight.
Sizing, Packaging and MOQ for OEM Orders
Injection moulding plants consume gloves by real size mix, not tidy carton mathematics. A normal adult dipped-glove run is sizes 7 to 11, with sizes 9 and 10 often taking the biggest share on male-heavy press lines. Packing or inspection teams may need size 6 or 7 in meaningful quantities. Bad sizing causes more waste than a small unit-price saving: tight gloves split at the thumb crotch, while loose gloves catch on flash, fixtures or conveyor edges. For OEM dipped injection moulding gloves, a realistic MOQ is usually 3,000 to 5,000 pairs per colour and coating style when standard yarn is used. If the buyer wants custom liner colour, special cuff overlock, private-label heat transfer, individual barcode stickers or retail header cards, the practical MOQ can rise because each printing plate, colour change and packing setup has fixed labour. For a first trial, we prefer using existing yarn and coating colours so the buyer tests performance, not artwork complexity. Packing needs to be fixed before the PO, not after production. Bulk industrial packing is often 12 pairs per polybag and 120 pairs per export carton. Single-pair polybags suit PPE vending machines but add material and packing labour. Depending on liner weight and coating, a carton of dipped gloves may weigh around 8 to 14 kg. A 20 ft container may load roughly 700 to 900 standard cartons if cartons are not oversized. Mixed sizes, header cards and display packs reduce loading efficiency. For first orders, LCL under FOB Ningbo or Shanghai is common. DDP quotes need destination address, HS code treatment, duty rate, delivery type and whether the buyer needs Amazon-style carton labels.
What to Put in the Trial Order Specification
A useful trial specification should be short, measurable and tied to the task. Example: 13 gauge HPPE-polyester-glass-spandex liner, black sandy nitrile palm coating, knitted wrist, EN388:2016+A1:2018 target 4X43C, optional EN407:2020 X1XXXX, sizes 7 to 11, 12 pairs per polybag, 120 pairs per carton. Add any chemical restrictions clearly: DMF-free for PU coating, latex-free if required by policy, or silicone-free if the gloves are used before painting, printing, bonding or adhesive assembly. Quality requirements should also be written before mass production. Critical defects include broken needle contamination, wrong glove type, severe coating holes and unsafe foreign matter. Major defects include coating delamination, missed logo print, wrong size marking, visible liner contamination, hard coating lumps and serious pair mismatch. Minor defects include loose threads, small print position variation and light colour shade difference. Many importers inspect to ANSI/ASQ Z1.4 with AQL 2.5 for major defects and 4.0 for minor defects, but the buyer and factory should agree the exact sampling plan on the PO. The best trial is small but real. Send 5 to 10 pairs per size to the press, trimming bench and packing table for at least one full shift. Ask operators to record grip on oily parts, heat feel in seconds, cut damage at the thumb and index finger, sweating, smell, cuff comfort and marks on parts. After the trial, change only one variable at a time: 13 gauge to 15 gauge, PU to sandy nitrile, cut B to cut C, or black coating to grey. Changing yarn, coating, gauge and packing together makes the feedback almost useless for the next production run.
Talk to Someone Who Actually Makes Gloves
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