Moldex 6647 Goin Green PlugStation Dispenser NRR 33 500 Pairs Review (2026)

Is the Moldex 6647 Goin' Green PlugStation Dispenser NRR 33 the Right Earplug System for Your Facility?

Published June 12, 2026 · Last updated July 27, 2026

If your facility burns through earplugs at scale — manufacturing lines, food processing, chemical plants, construction yards — the Moldex 6647 Goin' Green PlugStation Dispenser NRR 33 500 Pairs is engineered to solve exactly that problem. With a maximum NRR 33 dB rating, a wall-mount bulk-dispenser format, and a clean-chemistry PVC-free foam that eliminates the most common workplace allergens, this is not a casual jobsite earplug. It is a purpose-built hearing conservation tool designed to keep a hearing conservation program running without constant restocking runs. The short answer: yes, for high-noise industrial settings where OSHA 29 CFR 1910.95 compliance and long-term cost control both matter, the Moldex 6647 earns a place on your wall.

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Moldex 6647 Goin' Green PlugStation Dispenser NRR 33 500 Pairs Review (2026)

Hearing loss is the most frequently recorded occupational illness in U.S. manufacturing — and the most preventable. OSHA 29 CFR 1910.95 mandates hearing conservation programs when 8-hour time-weighted average (TWA) noise exposures reach or exceed 85 dBA, and engineering controls alone rarely bring exposure below that threshold. That leaves administrative controls and PPE as the front line, which is where a high-NRR, bulk-dispenser earplug system like the Moldex 6647 earns its place.

Within the WC Safety Hearing Protection lineup, the 6647 sits at the top of the NRR scale — NRR 33 dB — alongside disposable foam competitors like the 3M 1100 and Howard Leight MAX series. What separates it is the Goin' Green material commitment: polyurethane foam free of PVC, chloroprene, latex, and diisocyanates, a formulation that matters in food processing, pharmaceutical, and chemical environments where material-safety audits are routine. The PlugStation dispenser format — a wall-mount unit holding 500 uncorded pairs — converts a compliance task into a passive infrastructure decision: mount once, refill quarterly, and let the dispenser do the behavioral nudge.

This review cross-references the ANSI S3.19-1974 test methodology that produced the NRR 33 rating, applies the OSHA-mandated 50% derating to derive a real-world attenuation estimate, and gives you a frank assessment of where the 6647 excels and where it falls short. If you are researching the broader category first, see our NRR Hearing Protection Guide and our Best Earplugs for Work roundup before returning here.

Overall Verdict: 4.7 / 5 — Best-in-class NRR with a dispenser format that pays for itself in compliance hours saved.

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Who Should Buy the Moldex 6647 Goin' Green PlugStation Dispenser?

The 6647 is purpose-built for high-volume industrial hearing conservation. These are the buyer profiles where it delivers clear value:

• Manufacturing EHS Managers overseeing OSHA 1910.95-mandated programs who need a dispenser that reduces compliance friction and keeps earplugs visible and accessible on the floor.
• Food and Beverage Processing Facilities where clean-chemistry PPE is part of supplier or regulatory audit scope — the PVC-free, allergen-free formulation checks those boxes without a separate approved-materials review.
• Chemical and Pharmaceutical Plants where material-safety data matters and contamination risk from conventional foam additives is a concern.
• Construction Site Safety Officers managing noise-exposed crews on compressor or concrete-cutting operations and needing bulk stock that fits a job-trailer supply cabinet.
• Shooting Range Operators who need maximum-rated hearing protection for customers and staff at counters exposed to muzzle blast, where NRR 33 is a defensible ceiling.
• Facility Managers who want to reduce per-unit earplug cost through bulk purchasing while simultaneously eliminating individual foil-pack waste from daily distribution.

If you are still comparing categories, see the full Hearing Protection collection or our Best Hearing Protection for Industrial Workers guide.

What the Moldex 6647 Does Well

Maximum NRR Performance

The NRR 33 dB rating was produced under ANSI S3.19-1974 test methodology — the standard OSHA accepts for hearing protector rating. Applied at the OSHA-mandated 50% derating, the effective attenuation is approximately 13 dB, meaning a worker in a 100 dBA environment would experience an effective exposure of about 87 dBA. At 103 dBA TWA, that same worker reaches 90 dBA, which is OSHA's PEL for an 8-hour shift. For most industrial settings in the 95–100 dBA range, the 6647 provides genuine, measurable protection margin. See our NRR Hearing Protection Guide for the full derating calculation.

Roll-Down Insertion and Fit Consistency

The 6647 uses a standard roll-down compression insertion method: compress the foam to a narrow cylinder with clean dry hands, insert into the ear canal, hold 20–30 seconds while the foam expands to seal. This technique is well-established, covered in most hearing conservation training programs, and produces consistent attenuation when done correctly. The bright green color also makes it easy for supervisors to confirm at a glance that earplugs are correctly inserted — an underrated compliance advantage in noisy visual-inspection environments. For insertion technique details, see our Best Foam Earplugs for Manufacturing guide.

Clean-Chemistry PU Foam

Moldex's Goin' Green formulation strips out the chemical families most commonly flagged by EHS and procurement teams: PVC, chloroprene, latex, and diisocyanates. In food processing and pharmaceutical settings, that list aligns with typical allergen-exclusion and REACH-adjacent sourcing requirements. It also simplifies SDS review for safety teams — fewer hazardous constituents mean a cleaner compliance file. For a broader look at earplug material tradeoffs, see our Reusable vs Disposable Earplugs guide.

PlugStation Dispenser Format

The wall-mount PlugStation converts earplug access from an active supply-room task into passive infrastructure. Workers pull a pair as they enter the noise hazard zone; the dispenser refill schedule is a single quarterly event rather than daily individual distribution. This format consistently improves compliance rates in facilities where the dispenser is mounted at the noise-zone entry point — a behavioral nudge backed by multiple NIOSH hearing conservation studies. Browse our full Hearing Protection collection for additional dispenser options.

Bulk-Pack Economics

At 500 pairs per dispenser, the 6647 delivers one of the lowest unit costs in the disposable earplug category. For a facility running 50 workers on a 250-day schedule at one pair per worker per day, a single dispenser covers four days of full deployment. Volume purchasing further reduces per-pair cost — see the TCO section below. Our Best Moldex Earplugs guide compares value across the full Moldex range.

Where the Moldex 6647 Falls Short

No Metal-Detectable Option in This SKU

Food processing lines running metal-detection or X-ray inspection equipment require metal-detectable PPE throughout the production zone — including earplugs. The Moldex 6647 is not metal-detectable. Facilities with that requirement need a different earplug SKU. Check the Ear Plugs collection for metal-detectable alternatives.

Single-Use Disposable Cost Profile

Disposable foam earplugs are the highest-attenuation option at the lowest upfront price, but their ongoing consumable cost accumulates. Over a 3-year TCO window, a reusable earplug program can undercut disposable cost substantially — though reusables require a hygiene-maintenance program and carry their own compliance overhead. See the TCO section and our Reusable vs Disposable Earplugs guide for the full comparison.

Uncorded Only

Some facility safety policies require corded hearing protection — particularly in environments where a dropped earplug risks falling into equipment or product. The 6647 is uncorded. Facilities with a corded-earplug requirement need to look elsewhere in the Hearing Protection collection.

Humidity and Storage Sensitivity

Polyurethane foam earplugs are sensitive to sustained humidity. Dispensers mounted in high-humidity zones — near wash-down stations, steam lines, or outdoor installations in wet climates — can allow foam to absorb moisture and lose recovery speed, which degrades attenuation. Indoor dry-environment mounting is the correct application for this product.

How the Moldex 6647 Compares to Competing Earplugs

Moldex Goin' Green Series: Which SKU Is Right for You?

• Choose the 6647 PlugStation if you need wall-mount dispenser infrastructure and maximum bulk-pack economics at 500 pairs.
• Choose the 6644 box format if you prefer to stock earplugs in a supply room or first-aid station without a mounted dispenser.
• Choose the 6645 corded if your site safety policy mandates a cord to prevent dropped earplugs from contaminating product or falling into machinery.

Compatible Products and Accessories

Hearing protection rarely works in isolation. The most effective hearing conservation programs pair high-NRR earplugs with supporting equipment and documentation systems:

• PlugStation refill packs — bulk refill bags of Moldex 6644 pairs to restock the 6647 dispenser without purchasing a new unit each cycle. See the Ear Plugs collection for available refills.
• Safety glasses combos — for environments requiring both eye and hearing protection, check the PPE collection for bundled options.
• Audiogram program resources — OSHA 1910.95 mandates baseline and annual audiograms for employees in hearing conservation programs. Our Hearing Conservation Program Guide covers audiogram requirements and vendor selection.
• Noise dosimeters — correct earplug selection starts with measured TWA exposure data. Our NRR Hearing Protection Guide covers how to use dosimeter data to select the right NRR class.

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NRR, OSHA 1910.95, and Why They Matter for Industrial Earplug Selection

The Noise Reduction Rating (NRR) is a single-number measure of a hearing protector's laboratory attenuation, calculated per ANSI S3.19-1974. It represents the decibel reduction achievable under ideal laboratory fit conditions. Because real-world fit is rarely ideal, OSHA requires a 50% derating when using the NRR to estimate effective employee exposure. The formula: Effective Exposure (dBA) = TWA Exposure (dBA) − [(NRR − 7) ÷ 2]. For the Moldex 6647 with NRR 33: effective attenuation = (33 − 7) ÷ 2 = 13 dB. A worker in a 103 dBA environment would have an estimated effective exposure of 90 dBA — OSHA's permissible exposure limit for an 8-hour shift.

OSHA 29 CFR 1910.95 establishes the hearing conservation program framework: engineering controls first, then administrative controls, then PPE. When 8-hour TWA exposures reach or exceed 85 dBA (the action level), employers must implement an HCP including audiometric testing, training, and provided hearing protection. At or above 90 dBA (the PEL), hearing protection must be used. The 6647's NRR 33 rating provides adequate coverage for most industrial noise environments up to roughly 103 dBA TWA when derated per OSHA guidance. For exposures above that threshold, dual protection (earmuff over earplug) is the appropriate control. See our OSHA Hearing Conservation Program Guide and NRR Hearing Protection Guide.

EPA 40 CFR Part 211 further governs NRR labeling on hearing protector packaging — the label on the Moldex 6647 box is a regulatory document, not marketing copy. For workers new to earplug selection, our Best Earplugs for Work guide is the right starting point.

Total Cost of Ownership: Moldex 6647 Dispenser Economics

For a facility running 50 workers in a noise-hazard zone on a 250-workday year, at one pair per worker per day:

• Annual consumption: 50 workers × 250 days = 12,500 pairs/year
• Dispensers needed: 12,500 ÷ 500 = 25 PlugStation refill cycles per year
• Estimated cost-per-pair: At a typical bulk price of approximately $0.25–$0.30/pair for 500-count dispensers, annual cost = ~$3,125–$3,750 for 12,500 pairs
• Vs. individually packaged earplugs: Pillow-pack individual earplugs typically run $0.40–$0.60/pair. Same 12,500-pair consumption = $5,000–$7,500/year — a 40–60% premium over bulk dispenser pricing
• Reusable alternative TCO: A reusable earplug at ~$2.00/pair with a 30-day service life = ~12 pairs/worker/year × 50 workers = 600 pairs × $2.00 = $1,200/year for consumables. However, add hygiene station cost, wash-time labor, and program management overhead before claiming that as a win. See our Reusable vs Disposable Earplugs guide for the full TCO model.

For large-facility or multi-site procurement, see the Hearing Protection collection for volume purchasing options.

Final Verdict: 4.7 / 5 — Industrial-Grade Hearing Protection That Earns Its Wall Space

Buy this if: you manage a formal OSHA 1910.95 hearing conservation program, need maximum NRR 33 performance, want clean-chemistry PVC-free foam that clears food, pharma, and chemical material-safety reviews, and need a dispenser format that drives passive compliance at the noise-zone entry point. The 500-pair bulk count gives you one of the best cost-per-pair economics in the disposable earplug category. See our Best Moldex Earplugs guide to compare across the full Moldex range.

Buy something else if: your facility requires corded earplugs (look at the Moldex 6645), metal-detectable earplugs (check the Ear Plugs collection), or if a long-term reusable program is a better TCO fit (see our Reusable vs Disposable Earplugs guide). Also consult the Best Hearing Protection for Industrial Workers guide if you are still narrowing format and protection level.

Overall Verdict: 4.7 / 5 — Best-in-class NRR with a dispenser format that pays for itself in compliance hours saved.

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Frequently Asked Questions: Moldex 6647 Goin' Green PlugStation NRR 33

What does NRR 33 mean on the Moldex 6647?

NRR 33 means the earplugs attenuate laboratory noise by 33 decibels under ANSI S3.19-1974 test conditions. After OSHA's mandatory 50% derating, effective real-world protection is approximately 13 dB. See our NRR Hearing Protection Guide for the full calculation.

Is the Moldex 6647 OSHA compliant for a hearing conservation program?

Yes. The Moldex 6647 meets ANSI S3.19-1974 requirements and is an acceptable hearing protector under OSHA 29 CFR 1910.95. Whether it provides sufficient attenuation for a specific worker depends on measured TWA exposure. See our OSHA Hearing Conservation Program Guide.

How do I correctly insert the Moldex 6647 earplugs for maximum attenuation?

Roll the foam down to a thin cylinder with clean, dry fingers. With the opposite hand reaching over the top of the head to pull the ear canal open, insert the compressed plug and hold 20–30 seconds while it expands. A proper fit will feel snug and reduce ambient sound noticeably. See our Best Foam Earplugs for Manufacturing guide for detailed insertion technique.

Are the Moldex 6647 earplugs reusable?

No. The Moldex 6647 is a single-use disposable foam earplug. Discard after each use. For reusable alternatives, see our Reusable vs Disposable Earplugs guide and the Ear Plugs collection.

Are the Moldex 6647 earplugs latex-free?

Yes. The Goin' Green formulation is free of latex, PVC, chloroprene, and diisocyanates — suitable for workers with latex or chemical sensitivities. Confirm with your occupational health team for individual allergy management protocols.

Are the Moldex 6647 earplugs metal-detectable?

No. The 6647 is not metal-detectable or X-ray detectable. Food processing lines with contamination-detection systems require a metal-detectable earplug SKU. Check the Ear Plugs collection for metal-detectable options.

How does the Moldex 6647 PlugStation dispenser mount?

The PlugStation is a wall-mount dispenser designed for screwed-in mounting at noise-hazard zone entry points. Moldex provides mounting hardware with the unit. The dispenser holds 500 pairs and is typically refilled using Moldex bulk-bag refill packs.

What is the effective noise protection level after the OSHA derating?

Using OSHA's 50% derating: (33 − 7) ÷ 2 = 13 dB effective attenuation. A worker in a 100 dBA environment would experience approximately 87 dBA effective exposure. A 103 dBA environment results in approximately 90 dBA — OSHA's PEL for an 8-hour shift.

Can I use the Moldex 6647 for shooting range hearing protection?

Yes. NRR 33 is the maximum single-device rating in the disposable foam class and is appropriate for shooting range applications. For sustained high-round-count sessions, dual protection (earmuff over earplug) is recommended. See our Best Hearing Protection for Industrial Workers guide.

How many earplugs does the Moldex 6647 dispenser hold?

The Moldex 6647 PlugStation holds 500 pairs (1,000 individual earplugs).

What material is the Moldex 6647 earplug foam?

Polyurethane (PU) foam, formulated without PVC, chloroprene, latex, or diisocyanates — the Moldex Goin' Green material specification.

How does the Moldex 6647 compare to the 3M 1100 earplug?

The Moldex 6647 has a higher NRR (33 vs. 29 dB) and a full clean-chemistry PVC-free formulation. The 3M 1100 is widely available in pillow-pack individual format but lacks the dispenser-station format and the Goin' Green allergen exclusions. For the full comparison, see our Best Earplugs for Work roundup.

Is the Moldex 6647 corded?

No. The 6647 is uncorded. For a corded Goin' Green option, see the Moldex 6645. Browse all corded options in the Ear Plugs collection.

What is the best earplug insertion technique for all-day comfort?

Fully compress the foam before insertion and allow complete expansion before removing your fingers. Under-compression is the most common cause of poor fit and reduced attenuation. See our Best Foam Earplugs for Manufacturing guide for a detailed walkthrough.

Do I need to wash or sanitize the Moldex 6647 earplugs?

No. The 6647 is single-use disposable. Do not attempt to wash and reuse. Washing degrades the foam structure and reduces attenuation. Discard after one use.

Where can I find the SDS for the Moldex 6647?

Moldex publishes SDS documentation at moldex.com. Contact WC Safety or Moldex directly for SDS access. The Goin' Green formulation's clean-chemistry profile means the SDS hazard classification is minimal for this product.

What TWA noise level is the Moldex 6647 appropriate for?

After OSHA 50% derating, the 6647 is appropriate for up to approximately 103 dBA 8-hour TWA as a single-protector solution. Above that level, dual protection is required. See our NRR Hearing Protection Guide.

What is the difference between OSHA and NIOSH NRR derating methods?

OSHA requires a 50% derating of the labeled NRR. NIOSH recommends 70–80% derating for foam earplugs based on subject-fit data, yielding approximately 9–10 dB effective attenuation for the 6647. Our NRR Hearing Protection Guide covers both methods side by side.