How to specify SMT PCB assembly gloves for ESD control, flux handling, solder mask protection and operator comfort, with real yarn, coating, MOQ and inspection points.
The Spec That Usually Works on an SMT Line
The safest starting spec for SMT PCB assembly gloves is a 15-gauge nylon and carbon conductive liner with white or grey PU on the fingertips. Use 13-gauge only when the work includes punched PCB panels, aluminium trays, sheet-metal brackets or sharp connector housings. A 15-gauge liner gives better finger shape for connector insertion, test jig loading, AOI rework handling and final visual inspection. A 13-gauge liner costs less and lasts longer, but it feels bulkier when operators handle 0603 and 0402 components. Most electronics gloves are not knitted from full conductive yarn. The usual construction is nylon or polyester base yarn with carbon yarn knitted in stripes every 8 to 10 mm. Full carbon content is possible, but it is stiffer, darker, more expensive and usually unnecessary for normal EPA work. For a buying spec, write the gauge, base yarn, conductive stripe spacing, coating area, colour, size range and resistance target. Do not write only anti-static glove. A practical resistance target is surface resistance in the 10⁶ to 10⁹ ohm range, tested using a method aligned with IEC 61340-5-1 control practice. If your plant is audited to ANSI/ESD S20.20, ask the ESD coordinator for the exact acceptance window and test conditions. Humidity, electrode pressure and pre-conditioning time can move the result. We can make ESD-style gloves, but we cannot promise that the glove alone makes a workstation compliant; grounding, flooring, wrist straps, packaging and ionisers still decide the system result.
PU, Nitrile and Bare Carbon Knit Are Not Interchangeable
PU fingertip coating is the normal choice for dry PCB handling because it is thin, clean-feeling and flexible. The knitted liner is put on ceramic or aluminium hand formers, dipped into water-based polyurethane, drained, then cured through an oven before stripping and pairing. Fingertip PU usually covers the thumb, index and middle fingertips, sometimes all five fingers. It keeps the palm breathable, which matters on 8 to 10 hour shifts where sweaty hands create rejection faster than abrasion failure. Palm PU gives more grip on trays and panels, but it also traps more heat and adds cost. A full palm dip is better when operators handle metal carriers, cut PCB edges or plastic bins. It is not automatically better for fine assembly. Too much coating can make operators push harder on solder mask, test pads or gold fingers. Nitrile coating gives better abrasion and light oil resistance than PU, especially on packing benches and frame assembly. The trade-off is thickness. Flat nitrile or micro-foam nitrile can feel clumsy for small connectors, flex cables and component tape handling. We make nitrile palm-coated electronics gloves, but we normally do not recommend them as the first sample for SMT placement or final board inspection. Bare nylon-carbon knit is cheaper and breathable, often 15-gauge or 18-gauge, but it is weak for fingerprint control. Skin oil can pass through the fabric, especially at the thumb and index finger. If the complaint is solder mask smudging, contact marks on HASL or ENIG pads, or contamination on gold fingers, approve bare knit only after a line trial with actual boards.
Flux, IPA and Chemical Limits
SMT PCB assembly gloves are not chemical gloves under EN ISO 374. PU coating handles dry boards, cardboard dividers, ESD trays and light flux residue, but it is not designed for repeated soaking in IPA, acetone, flux remover or aggressive no-clean activators. Rosin flux residue can make the fingertip tacky. Repeated IPA wiping can harden PU, weaken the coating edge and shorten service life from several days to one or two shifts. If operators clean boards for several hours per shift, test a disposable nitrile glove over the ESD glove or replace the glove type at that station. Do not assume the ESD result remains the same after layering gloves. Test resistance at the actual bench with the same wrist strap, mat, footwear and humidity condition used in your EPA. A useful approval trial is 20 pairs in one SMT cell for 5 working days. Record fingertip peeling, coating swelling, black-card lint, grip loss, odour, operator rejection and visible marks on solder mask. Keep one sealed counter sample at purchasing and one at IQC. When bulk arrives, compare coating edge height, fingertip coverage, carbon stripe spacing and liner colour against those retained samples. EN 388 abrasion numbers can help for general durability, but they do not prove flux resistance or low contamination.
Documents We Can Support and Claims We Will Not Make
GloveMark can produce nylon-carbon, polyester-carbon and mixed-yarn ESD-style knitted gloves with PU fingertip, PU palm or nitrile palm coating. For qualified orders, we can arrange third-party surface resistance testing and provide a material declaration, packing specification, carton label artwork and pre-shipment inspection report. Typical factory inspection uses ANSI/ASQ Z1.4 or ISO 2859-1 sampling, commonly AQL 2.5 for major defects and AQL 4.0 for minor defects unless the buyer sets a stricter plan. We will not invent ISO Class 5 cleanroom claims for a normal knitted glove. A standard Yiwu knitted ESD glove is not washed, double-bagged and packed in a cleanroom laundry process. If you need cleanroom-compatible gloves, particle and extractable requirements must be discussed before sampling, and the price route is different. For EU PPE buyers, CE marking under Regulation EU 2016/425 must be declared at the start. EN 16350 is often mentioned for electrostatic properties, but not every PCB glove carries that certification. If EN 388, EN 16350, REACH SVHC, RoHS-related material declarations or a specific DoC are required, list them in the RFQ. Certificates are not decoration; they affect lab cost, timeline, artwork and whether we can legally put marks on the glove or packaging.
Price, MOQ and Production Reality
The lowest-cost construction is 13-gauge polyester-carbon with PU fingertips. It is suitable for general PCB handling, packing and stores work where fine dexterity is less critical. The better SMT spec is 15-gauge nylon-carbon with tighter finger sizing, cleaner knitting and more even PU pickup. Nylon usually feels smoother than polyester and recovers better after stretching, but it costs more. For private-label orders, realistic MOQ is usually 3,000 to 5,000 pairs per colour and size mix for a standard style. A full size run from XS to XXL needs planning because XS and XXL may require separate machine setup and can raise the unit price. Counter samples normally take 2 to 3 weeks after artwork and spec confirmation. Bulk production is commonly 4 to 6 weeks after sample approval and deposit, longer if third-party testing, CE documentation or custom packaging is involved. Decoration should not interfere with the working face. Back-of-hand screen printing is possible, but keep ink away from PU fingertips and high-flex knuckle areas. Heat-transfer labels look retail-ready, but some EMS plants reject raised labels, loose threads and embroidery because they can catch on fixtures or trays. For most industrial buyers, a clean inner bag label with size, SKU, batch number, production date and coating type is more useful than a large logo.
Inspection, Packing and Shipment Controls
Incoming inspection should include more than carton count. For a shipment of safety-sensitive SMT PCB assembly gloves, many buyers check 125 or 200 pairs under an AQL plan. Major defects include missing conductive stripes, wrong coating area, mixed sizes, left-left or right-right pairs, open seams, skipped stitches between thumb and index finger, dirty fingertips, hard PU ridges and obvious coating bubbles. Minor defects include shade variation, small print misalignment or loose yarn tails outside the working area. Surface resistance should be checked on random samples using the buyer's normal method and conditioning. A glove tested at 12 percent RH can read differently from the same glove at 50 percent RH. If your audit requires records, define the test voltage, electrode type, conditioning time and pass range in the purchase order, not after the cartons arrive. Packing is usually 10 or 12 pairs per polybag and 120 to 240 pairs per export carton, depending on gauge and coating area. A 15-gauge PU fingertip glove packs far smaller than a sandy nitrile work glove, so sea freight is rarely the main cost driver. Lot mixing is the bigger risk. Ask for carton marks showing PO number, size, batch, quantity, gross weight, net weight and made in China origin. For FCA Yiwu, FOB Ningbo or FOB Shanghai, confirm carton dimensions before booking. If you need GS1 barcodes, bonded-warehouse labels or Amazon-style carton rules, provide the data before bulk packing starts. Relabelling after inspection wastes labour and creates mismatched carton records.
Quote Comparison Welcome
If you already have a quote from another supplier, send it over with the spec sheet - we will quote against it line by line and tell you where we are cheaper, where we are not, and why. Most useful for buyers on order #2 or #3.
Disclaimer: nothing here is legal or customs advice. For HS-code classification and duty rates, please verify with your customs broker.