CONDUCTIVE-YARN MEDICAL WORKWEAR: AN ELECTROSTATIC EVIDENCE CHECKLIST

Separate a uniform brief from an electrostatic safety claim

A buyer may ask for a comfortable staff uniform, clothing for an electronics-controlled area, or protective clothing in a workplace with an ignition hazard. Those are not interchangeable uses. Write down who wears the garment, what static-related consequence matters, whether the requirement applies to cloth or the assembled garment, and the destination-market specification owner. A hospital-related product category does not by itself make a fabric a medical device or a biological barrier. Likewise, a conductive stripe does not demonstrate that a garment is suitable for an explosive atmosphere. Obtain the applicable controlled requirement from the buyer's safety or compliance team before requesting a certificate. If the application is simply a non-protective uniform, do not market it as certified protective clothing.

Choose a method that answers the actual question

ISO's public summary of ISO 18080-1:2015 describes a fabric electrostatic-propensity method using corona charging and measuring peak voltage and charge-decay time. Importantly, its summary warns that the methods may not suit personnel-safety or electrostatic-discharge-sensitive-device protection assessments. BSI describes BS EN 1149-5:2018 as material-performance and design requirements for electrostatic-dissipative protective clothing used as part of an earthed system in a particular ignition-hazard context. These publications therefore should not be treated as equivalent badges for a hospital uniform. Ask a competent laboratory and the responsible buyer to specify the method, edition, specimen, conditioning, repeat measurements, units and pass rule appropriate to the actual claim. A method title alone supplies neither a product-specific result nor approval.

Freeze the specimen before comparing laboratories

Request an identified swatch from the exact offered article, not an anonymous piece of 'carbon fabric'. The record should include model, fibre and conductive-yarn description, weave, grid or stripe arrangement, colour, finishing state, roll or development-lot identity and specification revision. Record which face and direction are measured if the selected procedure calls for them, and document the conditioning and care state. Compare results only where the methods and conditions match. If the intended uniform will be repeatedly laundered, agree whether measurements are required before and after a defined care procedure; do not copy a cycle-life number from an unrelated construction. Sewing, closures, non-dissipative trims and the wearer's grounding route may affect a finished-clothing claim, so fabric-only evidence cannot silently become a garment approval.

• Identify the exact finished construction and sample revision.
• Separate as-supplied and agreed after-care evidence.
• Keep fabric and garment conclusions in different approval records.

Use the three published Med-Guard records as construction references

PA1/ROOOSO 60C is listed as a dyed and set 99% polyester-textured-yarn and 1% conductive-yarn 2/2 twill grid, with 135 gsm ±5 gsm and 150 cm cuttable width. PA11/ROOOSO is listed as 99% polyester and 1% conductive yarn in a 150D/48F × 32S 2/1 twill with a 10 mm carbon-stripe description, 150 gsm ±10 gsm and 148 cm cuttable width. PA15/ROOOSO is listed as 99% polyester and 1% conductive yarn in a 150D × 300D 2/2 twill with a 10 mm stripe description, 170 gsm ±10 gsm and 148 cm cuttable width. These are different weight, yarn and weave routes for sample comparison, not a ranking of charge dissipation. The public catalogue does not provide a project-specific measured electrostatic result for any of the three. Ask which construction can meet the actual brief before claiming suitability.

Read reports and certificates without extending their scope

A useful test report identifies the laboratory, tested item, sample date or traceable ID, method edition, conditioning, measured values, uncertainty or deviations where reported, and the customer's acceptance rule. Confirm whether the result represents the dyed, finished fabric actually quoted. A general company or substance-related certificate, if applicable, cannot replace an electrical test for a particular construction. If the customer needs protective-clothing conformity, the product owner must separately assess material, design, assembly, marking and any required conformity route; a roll-fabric listing cannot do that work. Keep untested targets labelled as targets. When a colour, conductive-yarn supplier, finish or manufacturing process changes, agree which evidence must be repeated instead of assuming the previous report transfers automatically.

Send a supplier brief that produces a useful quote

State the garment type, wearer and workplace; identify whether the request is for ordinary uniform comfort, controlled-area charge management or a specified protective claim. Attach the controlled performance requirement and intended test method if your organisation has selected one. Include desired fabric weight and usable width, colour, estimated sample and bulk quantity, care route, garment construction and approval schedule. Ask the supplier to return the proposed article code, any existing product-matched test evidence, evidence gaps and a realistic development or laboratory plan. Review a physical sample against the agreed reference before treating price as the only decision. If no competent owner has defined a numerical or classification limit, request a feasibility discussion rather than an invented 'anti-static pass' promise.

• Name the claim and responsible approval owner.
• Request method-matched, traceable results rather than a generic badge.
• List unknowns separately from verified catalogue facts.