Moldex 6420 Rockets Review — NRR 27 Cloth-Cord Reusable Earplug, 50 pairs
Moldex 6420 Rockets Cloth Cord Reusable Earplug Review — NRR 27 for Outdoor and Warm-Environment Hearing Conservation
The difference between a plastic cord and a cloth cord on a reusable earplug might seem cosmetic. It is not. In warm manufacturing environments, outdoor construction sites, and agricultural settings where workers perspire continuously, a plastic monofilament cord can become slick with sweat, abrasive against sun-exposed skin, and prone to kinking and tangling when it thermally expands. The braided cloth cord on the Moldex 6420 Rockets addresses each of these contact points: it is softer against skin, absorbs minimal surface moisture without degrading, and maintains its flexibility across a wider temperature range than equivalent-diameter plastic cords.
Everything else about the 6420 is identical to the rest of the Rockets family — NRR 27 triple-flange TPE body, NIOSH approval under 29 CFR 11.57, push-in insertion compatible with gloves, and washable construction for weeks to months of reusable service. This review is for safety professionals deciding between the cloth-cord 6420 and other Rockets variants, or between the 6420 and competing corded reusable earplugs from other brands.
Editorial Verdict — 4.3 / 5
NRR 27 corded triple-flange TPE earplug with braided cloth cord. Best choice for warm-climate outdoor work or any setting where a plastic cord causes skin irritation or tangling problems. Effective real-world protection: 10 dB(A) per OSHA 50% derating.
Technical Specifications
| Specification | Detail |
|---|---|
| Model Number | Moldex 6420 |
| NRR | 27 dB |
| OSHA-derated protection | 10 dB(A) |
| Body material | Thermoplastic elastomer (TPE) |
| Flange design | Triple-flange, push-in insertion |
| Cord type | Braided cloth cord |
| Reusable | Yes — wash with soap and water |
| Service life | Weeks to months with proper cleaning |
| Quantity per pack | 50 pairs |
| NIOSH approval | 29 CFR 11.57 |
| Country of manufacture | USA (Covina, California) |
The Cloth Cord Advantage — When It Matters Most
Three distinct scenarios favor the cloth cord of the 6420 over the plastic cord of the standard 6405:
1. Warm and outdoor environments. Construction workers, landscaping crews, agricultural equipment operators, and outdoor maintenance personnel work in direct sun at ambient temperatures well above indoor factory norms. Plastic monofilament cords stiffen in cold and become more pliable in heat, but more importantly, they can feel abrasive against the back of a sunburned neck or sweat-soaked collar. The cloth cord's braided textile surface is consistently soft regardless of temperature and absorbs superficial sweat without retaining it (the cord can be rinsed and dried with the earplug bodies).
2. Tangling-prone environments. Workers who regularly don and doff hearing protection — such as those who alternate between loud machine operation and verbal communication tasks — frequently experience plastic cords kinking or tangling in their work clothing, tool harnesses, or personal protective equipment. Cloth cords, with their fibrous surface and greater flexibility, are significantly less prone to kinking and tend to drape naturally rather than coiling into tight loops.
3. Workers with plastic cord sensitivity. A minority of workers report contact dermatitis or localized irritation from extended daily contact with plastic monofilament cords. For these individuals, a cloth cord eliminates the irritant without requiring a complete change to a different earplug body or style.
Rockets Triple-Flange Body — Construction and Performance
The TPE triple-flange body of the 6420 is mechanically identical to all other Rockets variants. Three progressively sized flanges create a graduated seal: the innermost flange seals at canal entry, the mid flange provides the primary acoustic barrier, and the outer flange acts as a secondary seal and physical stop preventing over-insertion. This design is stable across a range of ear canal geometries — it does not rely on a precise canal diameter fit the way some banded or canal cap designs do.
The push-in insertion technique requires no rolling, no compression, and no waiting for foam re-expansion. Workers with gloves on can insert the 6420 as effectively as workers with bare hands. This is particularly relevant in outdoor construction and agricultural settings, where heavy leather gloves, rubber irrigation gloves, or thick work gloves are standard throughout the shift. Explore our safety gloves collection for compatible hand protection options.
Protection Analysis — NRR 27 in Outdoor Environments
Outdoor work environments present different noise exposure profiles than indoor manufacturing. Construction equipment noise is often impulsive or intermittent — jackhammers, concrete saws, and heavy equipment operate at 95–110 dB(A) at operator positions but may cycle on and off. The Rockets' 10 dB(A) OSHA-derated attenuation protects workers in time-weighted average exposures up to 100 dB(A). For intermittent exposures above 100 dB(A) TWA, dual protection (earplugs plus earmuffs) is necessary.
OSHA's construction noise standard (29 CFR 1926.52) uses the same action level and PEL thresholds as the general industry standard (29 CFR 1910.95): 85 dB(A) action level and 90 dB(A) PEL as 8-hour TWA. The 6420 satisfies both standards when TWA is at or below 100 dB(A). For a comprehensive look at hearing protection selection, read our in-ear hearing protection guide.
| Workplace TWA | Estimated Exposure with 6420 | Compliance Status |
|---|---|---|
| 85 dB(A) | 75 dB(A) | Below action level |
| 90 dB(A) | 80 dB(A) | Below PEL |
| 95 dB(A) | 85 dB(A) | Below PEL |
| 100 dB(A) | 90 dB(A) | At PEL — adequate |
| 105 dB(A) | 95 dB(A) | Above PEL — add earmuffs |
Cleaning the Cloth Cord
The cloth cord requires slightly different cleaning consideration than the TPE body. The braided textile can trap particulate contamination between fibers, particularly in dusty outdoor environments. For thorough cleaning:
- Rinse the entire assembly under warm running water, working the cord between fingers to dislodge particulate.
- Apply mild liquid soap and work a lather into the cord as well as the earplug flanges.
- Rinse thoroughly — soap residue in the cloth cord can be an irritant if it contacts the neck.
- Squeeze the cord gently between a clean cloth to remove excess water, then air-dry the complete assembly. Do not wring or twist the cord aggressively as this can fray the braid over time.
- Allow to dry completely before storing. Storing a damp cloth cord in a sealed container can promote mildew; air circulation is important.
Rockets Family Comparison — All Six Variants
- 6400 Uncorded — no cord; lowest cost per pair; workers who keep earplugs in all shift
- 6405 Standard Corded — plastic cord; general manufacturing with loss prevention
- 6415 Metal-Detectable Corded — metal-detectable compound; food/pharma
- 6420 Cloth Cord (this review) — braided cloth cord; outdoor and warm-climate environments
- 6480 Camo Uncorded — camouflage body; range and outdoor aesthetics
- 6485 Camo Corded — camo body with plastic cord; range with loss prevention
Who Should Choose the Moldex 6420
Choose the 6420 when your workers operate outdoors, in high-temperature indoor environments (foundries, bakeries, laundries), or in any setting where workers have complained about plastic cord discomfort. If your workforce is entirely indoor manufacturing with no temperature or cord-comfort complaints, the 6405 standard corded may be a more economical choice. If your facility requires metal-detectability, the 6420's standard TPE cord disqualifies it — specify the 6415 metal-detectable instead.
Browse our complete earplugs collection and hearing protection collection for the full range of options available to industrial safety programs.
Frequently Asked Questions — Moldex 6420 Rockets Cloth Cord
Q: Why choose a cloth cord earplug over a plastic cord earplug?
A: Cloth cords are softer against skin, less prone to kinking and tangling, and maintain flexibility in both warm and cool temperatures better than plastic monofilament. For outdoor workers and those in warm environments, this reduces irritation and improves compliance with cord-based hearing protection programs.
Q: Does the cloth cord affect the NRR of the Moldex 6420?
A: No. The NRR of 27 dB is a property of the earplug body geometry and fit — not the cord. The cloth cord attachment point does not alter the acoustic seal provided by the triple-flange TPE body.
Q: Is the Moldex 6420 NIOSH approved?
A: Yes. The 6420 is NIOSH approved under 29 CFR 11.57 at NRR 27, making it compliant for use in OSHA hearing conservation programs under 29 CFR 1910.95 and 29 CFR 1926.52.
Q: Can I wash the cloth cord?
A: Yes. Rinse the cord with warm water and mild soap, work the lather into the braided fibers, rinse thoroughly, and air-dry. Avoid wringing or twisting the cord aggressively to preserve the braid integrity. Allow the cord to dry fully before storing in a closed container.
Q: Is the Moldex 6420 metal-detectable?
A: No. The 6420 uses standard TPE and a standard cloth cord, neither of which contains metal-detectable compounds. For food processing or pharmaceutical applications requiring metal-detectability, specify the Moldex 6415 metal-detectable corded instead.
Q: How does the 6420 cloth cord differ from the 6405 plastic cord in practice?
A: The cloth cord is softer against skin, drapes more naturally, and resists kinking. In cool environments the difference is minimal. In warm or outdoor environments where the cord contacts perspiring skin all day, most workers report a clear preference for the cloth cord's texture.
Q: Are the Moldex 6420 earplugs one size fits all?
A: The 6420 is a one-size-fits-most adult design. Workers with very small or large canals may find better fit with the Jetz family, which uses extra-soft flanges and a foam-tipped stem. See our Jetz 6455 corded review for comparison.
Q: Can I use the Moldex 6420 with gloves on?
A: Yes. The push-in triple-flange design requires only a gentle push to insert — no rolling or compression. Workers wearing nitrile, latex, rubber, or light leather gloves can insert the 6420 correctly without difficulty.
Q: How many pairs per box for the Moldex 6420?
A: The 6420 is sold in a 50-pair bulk dispenser box, suitable for placement at facility entry points or tool crib stations where workers pick up their assigned pairs at the start of each shift.
Q: What is the OSHA derated protection of the Moldex 6420?
A: (27−7)÷2 = 10 dB(A) of effective noise reduction. This protects workers in environments up to 100 dB(A) TWA. For TWA above 100 dB(A), supplement with earmuffs from our hearing protection collection.
Q: How long does the cloth cord last?
A: With daily washing and careful drying, the cloth cord maintains integrity for the service life of the earplug bodies. Replace the pair when the cord shows fraying, significant fiber separation, or when the earplug flanges show signs of cracking or hardening.
Q: Where is the Moldex 6420 manufactured?
A: Moldex manufactures the 6420 in Covina, California, USA. The domestic manufacturing supports consistent quality and is relevant for facilities with Buy American or domestic-content procurement requirements.
Q: Is the 6420 appropriate for construction work?
A: Yes. The 6420 is well-suited for construction because it handles glove-on insertion, outdoor temperatures, and the push-in technique that is more reliable for intermittent use than roll-down foam. OSHA's construction noise standard (29 CFR 1926.52) is satisfied for TWA up to 100 dB(A).
Q: Can I use the 6420 for shooting range hearing protection?
A: The 6420 provides NRR 27 protection, which is adequate for some range scenarios, but impulse noise from firearms often benefits from higher-NRR options or electronic hearing protection. For range-specific guidance, see our best in-ear hearing protection for shooting guide.
Q: Where can I buy the Moldex 6420 cloth cord earplugs?
A: Purchase directly from WC Safety or find them on Amazon Check Price on Amazon →. WC Safety stocks the complete Moldex Rockets lineup for bulk industrial orders.
Related Resources
- Shop All Earplugs
- Shop All Hearing Protection
- Moldex 6405 Rockets Standard Corded Review
- Moldex 6415 Rockets Metal-Detectable Review
- Moldex 6480 Rockets Camo Uncorded Review
- Moldex 6450 Jetz Uncorded Review
- Best In-Ear Hearing Protection Guide
- Understanding NIOSH Approval Standards
Disclosures & editorial standards
WC Safety participates in the Amazon Services LLC Associates Program. Outbound Amazon links are affiliate links. We accept no manufacturer payment, sponsorship, or product samples. This content is not medical, legal, or regulatory advice. Safety equipment selection is governed by applicable OSHA standards and your facility's safety program.
WC Safety participates in the Amazon Services LLC Associates Program. Outbound Amazon links are affiliate links. We accept no manufacturer payment, sponsorship, or product samples. This content is not medical, legal, or regulatory advice. Safety equipment selection is governed by applicable OSHA standards and your facility's safety program.