{"id":2527,"date":"2026-08-22T00:00:00","date_gmt":"2026-08-22T00:00:00","guid":{"rendered":"https:\/\/swesd.com\/?p=2527"},"modified":"2026-08-20T06:57:23","modified_gmt":"2026-08-20T06:57:23","slug":"lifespan-smt-esd-supplies-replacement","status":"publish","type":"post","link":"https:\/\/swesd.com\/vi\/blog\/lifespan-smt-esd-supplies-replacement\/","title":{"rendered":"Th\u1eddi tu\u1ed5i th\u1ecd c\u1ee7a v\u1eadt t\u01b0 ch\u1ed1ng t\u0129nh \u0111i\u1ec7n SMT: Khi n\u00e0o c\u1ea7n thay th\u1ebf th\u1ea3m, d\u00e2y \u0111eo v\u00e0 trang ph\u1ee5c"},"content":{"rendered":"
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When an operations supervisor in Penang kept an ESD mat in service because it still looked clean, the next audit found an intermittent ground snap and resistance readings outside the site limit. The mat had not reached a universal expiration date; it had reached the end of verified service life. Appearance had replaced measurement.<\/p>\n

T\u00f3m t\u1eaft:<\/strong> SMT ESD supplies do not share one fixed lifespan. Replace consumables after their defined use, and replace reusable controls when inspection or verification fails, damage changes performance, calibration expires, or process risk changes. ANSI\/ESD S20.20 and IEC 61340-5-1 support a compliance verification plan; the organization must set intervals from risk, manufacturer guidance, and recorded performance.<\/p>\n

Why calendar age is not enough<\/h2>\n

A mat in a low-volume engineering cell and a mat on a three-shift PCBA line experience different abrasion, contamination, cleaner exposure, and connection cycles. The same is true for wrist straps, footwear, garments, and reusable containers. A date can trigger inspection, but it should not substitute for a pass\/fail criterion.<\/p>\n

The service-life record should include installation date, asset ID, location, baseline result, inspection history, repairs, and final disposition. This turns replacement from emergency purchasing into a planned smt supply<\/strong><\/a> decision.<\/p>\n

When mats and grounding hardware should be replaced<\/h2>\n

Replace or quarantine a mat when resistance-to-ground exceeds the approved limit, the ground connection is loose, the surface is cracked or swollen, or contamination cannot be removed without damaging the material. The installed mat should be verified rather than relying only on a supplier coupon.<\/p>\n

Wrist straps require a different check. Cord, resistor, snap, band, and skin contact all influence the path. Many sites test at each shift entry or use continuous monitors; a failed result means immediate investigation, not continued use until the next monthly inspection.<\/p>\n

\"Wrist
Wrist strap online monitor used for continuous ESD verification.<\/figcaption><\/figure>\n

How garments and footwear reach end of life<\/h2>\n

Garments degrade through laundering, seam damage, lost closures, embedded contamination, and conductive-fiber wear. Footwear changes with sole wear, contamination, insoles, and the person-flooring system. A visual inspection can find damage, but only the specified resistance test confirms the electrical path.<\/p>\n

For high-use V\u1eadt t\u01b0 ch\u1ed1ng t\u0129nh \u0111i\u1ec7n<\/strong>, maintain spare sizes and a controlled exchange process. The replacement stock must be qualified to the same specification; otherwise a failed garment can introduce an unreviewed substitute.<\/p>\n

Consumables: wipes, tapes, and rollers<\/h2>\n

Kh\u0103n lau ch\u1ed1ng t\u0129nh \u0111i\u1ec7n<\/strong> v\u00e0 Kh\u0103n lau khu\u00f4n in SMT<\/strong><\/a> are normally single-use or roll-limited consumables; the trigger is contamination, use completion, or printer roll depletion. Reusing a wipe moves paste and particles rather than removing them.<\/p>\n

B\u0103ng d\u00ednh ch\u1ed1ng t\u0129nh \u0111i\u1ec7n<\/strong> v\u00e0 rubberized tape<\/strong> should be replaced when adhesion, residue, wear, or floor condition no longer supports the intended marking or protection. A C\u00e2y l\u0103n b\u1ee5i<\/strong> needs a controlled peel or replacement rule so a saturated layer does not redeposit particles.<\/p>\n

Replacement Triggers for Mats, Straps, Garments, and Consumables<\/h2>\n
\n\n\n\n\n\n\n\n\n\n
Item<\/th>\nRoutine verification<\/th>\nReplace or quarantine when<\/th>\n<\/tr>\n<\/thead>\n
Bench\/floor mat<\/td>\nVisual inspection plus resistance-to-ground<\/td>\nFailed result, cracks, swelling, failed ground<\/td>\n<\/tr>\n
Wrist strap<\/td>\nDaily tester or continuous monitor<\/td>\nIntermittent\/failed path, damaged cord or snap<\/td>\n<\/tr>\n
Garment<\/td>\nInspection plus garment test where required<\/td>\nTorn seam, closure failure, failed resistance<\/td>\n<\/tr>\n
Footwear<\/td>\nPerson-footwear-flooring test<\/td>\nWorn sole, contamination, failed system result<\/td>\n<\/tr>\n
Wipes\/tape\/roller<\/td>\nLot check and use control<\/td>\nConsumed, saturated, residue, loss of function<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

How Replacement Frequency Changes by Work Area<\/h2>\n
\n\n\n\n\n\n\n\n\n
Risk level<\/th>\nSuggested control approach<\/th>\nPlanning implication<\/th>\n<\/tr>\n<\/thead>\n
High-volume production<\/td>\nFrequent automated or shift-based checks<\/td>\nKeep qualified spares at point of use<\/td>\n<\/tr>\n
Cleanroom process<\/td>\nLaundry\/particle controls plus electrical verification<\/td>\nTrack cycles and approved cleaners<\/td>\n<\/tr>\n
Low-volume lab<\/td>\nScheduled inspection and before-use checks<\/td>\nDo not extend intervals without evidence<\/td>\n<\/tr>\n
Mobile handling<\/td>\nPre-use checks for carts, straps, and containers<\/td>\nAssign ownership at handoffs<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

How S20.20 and IEC 61340 Address Replacement<\/h2>\n

ANSI\/ESD S20.20 and IEC 61340-5-1 require planned compliance verification but do not give one expiration date for every product. The organization defines test methods and intervals based on risk and performance. ISO 9001 supports asset records, corrective action, and supplier change control.<\/p>\n

\"ESD
ESD footwear inspected and tested as part of a person-flooring system.<\/figcaption><\/figure>\n

How to Set Evidence-Based Replacement Intervals<\/h2>\n