Product Catalog
ESD Wheels — Resistance Bands, the Grounding Path That Decides, and What to Verify Before You Buy
Updated 2026-11
An ESD wheel is specified by a number, and the number is only meaningful with its band and test method attached. The industry classification frame is ANSI/ESD S20.20-2021: conductive is ≤1×10^6 Ω, dissipative is >1×10^6 Ω and <1×10^9 Ω, measured per ANSI/ESD STM7.1. Suppliers quote different limits inside the same band — one offers conductive wheels at 10^4-10^6 Ω, which shares the 10^6 Ω ceiling but adds a floor the standard does not state — so a resistance figure without its limit and method cannot be compared across quotes.
The second thing buyers learn early: a conductive wheel touching the floor is not a grounding system. Effectiveness is system-level — the wheel must complete a conductive path from cart frame to floor connection, and every link in that path (frame, hardware, wheel, floor) either carries the charge or breaks the chain. We supply conductive and antistatic wheels as part of that path design; surface resistance is batch-measured and confirmed at quotation, never assumed from a material name.
Specifications
| Reference classification (industry) | ANSI/ESD S20.20-2021: conductive ≤1×10^6 Ω; dissipative >1×10^6 Ω and <1×10^9 Ω; measured per ANSI/ESD STM7.1 — the frame to write into an RFQ, not a supplier figure |
|---|---|
| Supplier-band variance (industry) | Suppliers quote different limits inside the same band (e.g. conductive at 10^4-10^6 Ω) — always demand the numeric limit and the test method with the figure |
| Application scope (manufacturer reference) | Conductive and antistatic wheels serve medical engineering, electrical and semiconductor industries, automotive, hospitals, pharmaceuticals and chemical sectors wherever discharge protection is required |
| Construction option (manufacturer reference) | Conductive treads are available in non-marking soft-cushion formulations — the historical trade-off between conductivity and floor marking is solved at the compound level, not by accepting black marks |
| Load de-rate (manufacturer reference) | Conductive/antistatic rubber wheel formulations carry approximately 60% of the standard model capacity — per-material line data, confirmed per configuration |
| Tenant policy | Surface resistance batch-measured per production batch; the numeric band for your order is stated on the quotation |
| Lead time | 15–20 days (custom configurations 30–40 days) |
| MOQ | 200 pieces (standard catalog items ship in smaller quantities) |
| Warranty | 18 months |
The ANSI bands are the published industry classification; the scope, construction and de-rate notes are published manufacturer references kept per-line. No resistance number on this page is a tenant rating — the tenant claim is batch measurement, and the band for your configuration is stated on the quotation.
Applications & Selection
Where ESD wheels earn their keep — and what they cannot do alone
The manufacturer scope is broad because the hazard is: electrostatic discharge protection is required wherever operators and sensitive goods meet — medical engineering, electronics and semiconductor production, automotive, hospitals, pharmaceuticals and chemical sectors. Wheels are one component of that protection; they make electrical contact between a moving cart and the ESD-control floor so charge generated by movement drains instead of accumulating.
The honest boundary is the path. A wheel that meets its resistance band on the bench does nothing if the conduction path breaks between the cart frame and the floor: a painted frame, a plastic spacer or an insulating floor each defeats it. Specifying ESD wheels is therefore a five-link exercise — conductive frame, conductive hardware, conductive wheel, floor, and the verification method that ties them together. Write the numeric band and the test method into the RFQ, not the words "anti-static".
Capacity shifts with the compound: the published conductive-rubber de-rate is roughly 60% of the standard model's rating, so an ESD conversion of an existing cart is a re-sizing exercise, not a like-for-like swap. Our supply path is own production plus outsourcing across conductive PU, conductive rubber and antistatic formulations; the conductive-casters family page covers the full casters (brake and mount) variants.
RFQ points that separate real ESD wheels from gray ones
State the band with its numbers (for example: dissipative, 1×10^6 to 1×10^9 Ω, measured per ANSI/ESD STM7.1), the floor and environment, the load per wheel after any de-rate, and whether the cart frame and hardware are part of the grounded path. Ask what the supplier's figure means: surface or volume resistance, which electrode configuration, what test voltage — two labs measuring the same wheel with different electrodes can return different numbers, and neither is wrong.
If your facility runs a formal ESD control program, the wheel spec belongs inside it: the program's qualification and periodic-verification discipline applies to carts and trolleys the same as workstations, and the quotation states the batch-measured value so your auditor sees the same number you bought.
Frequently Asked Questions
What is the difference between conductive and antistatic (dissipative) wheels?
The band, not the label. Per the ANSI/ESD S20.20-2021 frame, conductive wheels measure ≤1×10^6 Ω and dissipative wheels >1×10^6 Ω up to <1×10^9 Ω, measured per ANSI/ESD STM7.1. Suppliers quote different limits inside those bands, so insist on the numeric limit and test method in writing — "antistatic" alone is not a specification.
Do ESD wheels lose capacity compared with standard wheels?
The conductive/antistatic rubber formulations carry roughly 60% of the standard model's published capacity (manufacturer catalog data). Non-marking conductive polyurethane formulations recover more of it. Either way, an ESD conversion is re-sized, not swapped — and your configuration's rating is stated on the quotation.
Why is my ESD cart still building static charge with conductive wheels installed?
The path is broken somewhere else. A conductive wheel only works as part of a continuous conductive route from cart frame to floor — paint, plastic spacers, insulating floor finish or a missing floor-to-ground connection each break it. Verify the whole chain, not just the wheels, and match the wheel band to the ESD-control floor it rolls on.
Ordering & Documentation
Documents
Every order ships with a packing list and commercial invoice. The resistance band, test method and batch-measured value for your wheels are stated on the quotation and batch documentation; dimensional drawings are available on request.
Quotation
A quotation needs: the resistance band and test method your program requires, load per wheel (after de-rate), wheel diameter and mount, the floor type the wheels will roll on, and quantity. The confirmed quotation states the band your batch measures — published classes are the frame, the quotation is the commitment.
Sample & supply
Standard builds are produced to order with an MOQ of 200 pieces; smaller trial quantities of catalog items can ship in some sizes — ask with your RFQ. Lead time is 15-20 days standard, 30-40 days for custom compounds. The usual validation: measure sample wheels on your own floor with your own meter before the batch order — the same wheel reads differently on different floors.
Storage & shipping
ESD wheels ship in standard cartons; store away from silicone-containing products, which contaminate conductive compounds. Before installation, keep the tread clean — dirt films add resistance — and re-measure after the first week of service in your environment.