Moldex 6940 Glide Review — NRR 30 Uncorded Twist-In Foam Earplug, 100 pairs

Moldex 6940 Glide Review: Does No-Roll Twist-In Insertion Make the Difference in Your Hearing Conservation Program?

The Moldex 6940 Glide is an NRR 30 disposable foam earplug with a distinctive twist-in insertion system that eliminates the roll-before-insert step required by traditional foam earplugs. The smooth, tapered polyurethane foam surface allows a gentle twisting motion to insert the plug directly into the ear canal — addressing the #1 failure mode in foam earplug programs: under-rolling leading to shallow insertion and dramatically reduced protection.

Specifications

Feature	Details
Model	6940
NRR	30
Insertion Type	Twist-in (no rolling required)
Corded	No (uncorded)
Package Count	100 pairs
NIOSH Approval	29 CFR Part 11.57
Made In	USA — Covina, CA
Effective Protection	11.5 dB(A) per OSHA 50% derating

Twist-In Insertion: Why Elimination of Rolling Matters

Traditional foam earplugs require rolling into a tight cylinder before insertion. Workers in a hurry, in cold temperatures, or in environments where glove removal is inconvenient often under-roll — inserting a partially expanded plug that sits shallower in the canal and provides much less than labeled NRR. Studies of real-world earplug use show some workers achieve as little as 5-8 dB of protection with NRR 33 foam earplugs due to improper insertion.

The Glide's smooth tapered surface can be inserted with a gentle rotation without any preliminary rolling. Inserting a Glide with proper twist-in technique consistently achieves deeper canal insertion than even correct roll-and-insert technique in many users. Industrial hygiene professionals increasingly favor twist-in designs for programs where training compliance with rolling technique has been chronically difficult.

Food, Pharmaceutical, and Cleanroom Advantage

In food processing, pharmaceutical manufacturing, and cleanroom environments, rolling foam earplugs with bare hands creates a hygiene issue — the act of rolling concentrates skin oils and any residual contamination onto the earplug surface that then contacts the ear canal. Glide earplugs minimize hand-contact with the foam surface during insertion, reducing this concern. Many food safety programs have specifically adopted Glide-type earplugs for this reason.

Glide vs. Glide Corded vs. Glide Jar

Model	Description
6940 Glide (this)	100 pairs, uncorded, individually wrapped
6945 Glide Corded	100 pairs, with connecting cord
6686 Glide Jar	50 pairs in dispenser jar

OSHA Hearing Conservation Requirements: When Are Earplugs Mandatory?

OSHA 29 CFR 1910.95 (General Industry) requires employers to take action when workers are exposed to noise at or above specific thresholds:

Noise Level (TWA)	Required Action
85 dB(A) or above	Action Level: Establish Hearing Conservation Program; provide hearing protection; audiometric testing
90 dB(A) or above	PEL: Engineering/administrative controls required first; hearing protection mandatory
100 dB(A) or above	2-hour daily limit without protection; must use hearing protection
115 dB(A) or above	15-minute limit; double protection often required

The action level (85 dB(A)) triggers the full hearing conservation program requirement: noise exposure monitoring, baseline and annual audiometric testing, hearing protection provision, employee training, and recordkeeping. Many employers issue hearing protection to all workers in any area above 85 dB(A) regardless of measured TWA.

Understanding NRR: The Noise Reduction Rating Explained

Every NIOSH-approved earplug carries an NRR — the Noise Reduction Rating tested per ANSI S12.6 Method A (experimenter-supervised fit). Understanding how NRR translates to real-world protection is critical for compliance:

• OSHA method (50% derating): Effective dB = (NRR − 7) ÷ 2. For NRR 30: (30 − 7) ÷ 2 = 11.5 dB effective attenuation
• NIOSH method (75% derating for foams): Even more conservative — NIOSH recommends assuming only 25% of labeled NRR in real programs
• Maximum TWA with NRR 30 (OSHA method): 90 dB(A) PEL + 11.5 dB = 101.5 dB(A). At exposures above 101.5 dB(A), NRR 30 alone is insufficient; double protection or higher-NRR devices are needed

The gap between labeled NRR and real-world protection exists because laboratory testing uses trained subjects and careful supervised insertion. In the field, workers insert earplugs quickly, sometimes in poor light, without supervision — resulting in significantly less attenuation than the label suggests. This is why NIOSH derates foam earplugs more aggressively than other protection types.

Foam Earplug Insertion Technique: The Difference Between Full and Half Protection

Improper insertion is the single largest cause of earplug underprotection in hearing conservation programs. Studies have shown that workers who believe they are properly wearing foam earplugs often achieve only 50-60% of labeled NRR. Proper technique:

• Step 1 — Clean hands: Dirty hands introduce bacteria into the ear canal; always insert with clean hands
• Step 2 — Roll (for roll-and-insert types): Roll the earplug into a tight, thin cylinder — tighter is better for deep insertion and proper expansion
• Step 3 — Pull the ear: Reach over your head with the opposite hand and pull the top of your ear back and upward; this straightens the ear canal for deeper, more sealed insertion
• Step 4 — Insert deeply: Insert the rolled earplug deep enough that the end sits at or below the ear canal entrance; deep insertion is critical for achieving labeled NRR
• Step 5 — Hold: Keep holding the earplug in place for 20-30 seconds while the foam expands and fills the canal
• Step 6 — Check fit: Cup both hands over your ears and release — properly seated earplugs will produce a noticeable hollow, muffled sound change. If you hear little difference, reinsert

Hearing Conservation Program: What OSHA Requires Beyond Just Providing Earplugs

Simply handing out earplugs does not satisfy OSHA 1910.95. A compliant Hearing Conservation Program requires:

• Noise monitoring: Initial survey to identify exposures above 85 dB(A); remeasure when operations change significantly
• Audiometric testing: Baseline within 6 months of hire for noise-exposed workers; annual retest; professional review of test results; follow-up when Standard Threshold Shift (STS) is detected
• Hearing protection selection: Provide at least two types of hearing protection; ensure adequate attenuation for measured exposures using NRR calculations; replace worn or damaged devices
• Training: Annual training on effects of noise on hearing, purpose of audiometric testing, use and care of hearing protection
• Recordkeeping: Audiograms retained for duration of employment; noise measurement records retained 2 years; audiogram records retained 2 years

Browse all Moldex earplugs or see the full earplug selection at WC Safety including foam, banded, and reusable options.

Frequently Asked Questions

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