Met-L-Chek — Fluorescent Penetrant Inspection Kit 4016-4

Methods A & C | Level 3 Sensitivity | 1× FP-923 | 2× E-59A | 1× D-70 | Heavy-Duty Metal CaseSKU: 29807 | Kit No.: 4016-4

Overview

The Met-L-Chek Fluorescent Penetrant Inspection Kit 4016-4 is a professional-grade, fully self-contained fluorescent liquid penetrant inspection (FPI/LPI) kit designed for high-sensitivity surface flaw detection in field, shop, and aerospace maintenance environments. Combining three of Met-L-Chek's most trusted aerosol inspection products — a Level 3 fluorescent penetrant, a non-halogenated penetrant remover/cleaner, and a non-aqueous developer — in a robust, heavy-duty metal carrying case, this kit provides everything needed to perform a complete, code-compliant fluorescent penetrant inspection from start to finish.

Engineered for Methods A (water washable) and C (solvent removable) penetrant inspection techniques, the 4016-4 kit is equally at home on the aircraft maintenance hangar floor, the fabrication shop, the pipeline construction site, and the pressure vessel inspection station. Every product in this kit is low in sulfur and halogens, safe for use on all metal surfaces including titanium and high-nickel alloys, and approved to AMS-2644 and other major industry standards — making this the kit of choice wherever material safety and inspection sensitivity are both non-negotiable.

Kit Contents

Box Dimensions & Shipping Weight (Estimated)

Dimensions and weight are estimates based on typical packaging for 4-can aerosol penetrant inspection kit configurations of this class. Please verify with your freight forwarder prior to shipping.

Component Descriptions

Met-L-Chek FP-923 — Level 3 Fluorescent Penetrant (Type 1, Methods A & C)

FP-923 is Met-L-Chek's highest-performance water washable fluorescent penetrant and the core of this kit. As a Level 3 sensitivity penetrant, it is designed for the detection of extremely fine surface discontinuities — fine cracks, micro-porosity, and through-leaks — that lower sensitivity penetrants would miss entirely.

Key properties:

• Type 1 Fluorescent — produces brilliant yellow-green fluorescence under UV-A (365 nm) illumination, providing maximum contrast against the dark inspection background
• Level 3 Sensitivity — the highest sensitivity level available in the water washable (Method A) penetrant category
• Methods A & C Compatible — can be removed by water washing (Method A) or solvent wiping (Method C) depending on the inspection procedure and access conditions
• Clear, yellow-green liquid — no sediment; smooth washing and non-gel-forming for clean removal from rough surfaces
• VOC free — environmentally responsible formulation
• Low in sulfur and halogens — safe for use on titanium, high-nickel alloys, and all common aerospace and industrial metals
• Application methods — immersion, spray-on, electrostatic spray, wipe-on, and brush-on
• AMS-2644 Qualified Products List — approved for high-sensitivity aerospace applications

Met-L-Chek E-59A — Non-Halogenated Penetrant Remover/Cleaner (Method C)

E-59A is a Class 2 (non-halogenated), Method C solvent penetrant remover that serves a dual role in this kit — as both a pre-inspection surface cleaner and a post-penetrant excess remover for solvent wipe (Method C) technique applications.

Key properties:

• Class 2 Non-Halogenated — free of chlorine, fluorine, and other halogens; safe for use on all metals including titanium and high-nickel alloys
• Dual Function — suitable for both pre-inspection surface cleaning and post-penetrant solvent wipe removal; unlike E-59, E-59A is approved for use as a pre-inspection cleaner
• Moderate dry rate — allows adequate working time for thorough surface preparation and excess penetrant removal without evaporating too quickly
• Used in metalworking, welding, nuclear, aerospace, and automotive applications
• Two cans included — the extra can of E-59A in this kit reflects the dual-use nature of the product — one can typically dedicated to pre-inspection cleaning and one to post-penetrant removal

Met-L-Chek D-70 — Non-Aqueous Wet Developer (Form D/E)

D-70 is a non-aqueous wet developer that pulls residual penetrant from surface discontinuities to the inspection surface by capillary action — making indications visible and interpretable under UV-A illumination. Applied after excess penetrant has been removed and the surface has been dried, D-70 is compatible with all penetrant inspection Methods A, B, C, and D.

Key properties:

• Non-aqueous wet developer — Form "d" with fluorescent penetrants (Form "e" with visible penetrants)
• Compatible with Methods A, B, C & D
• Removable with water — easy post-inspection cleanup
• Safe for use on all metals — low in sulfur and halogens
• Aerosol application — fast, even coating for consistent developer layer across all inspection surfaces
• Applied after drying — optimizes bleed-out from tight surface-breaking discontinuities for maximum indication visibility

The Fluorescent Penetrant Inspection Process — Step by Step

The complete FPI process using the 4016-4 kit follows these steps:

1. Pre-clean — spray E-59A onto the inspection surface and wipe clean with a lint-free cloth to remove oil, grease, scale, and other contaminants that could mask or produce false indications
2. Apply penetrant — spray FP-923 evenly onto the inspection surface and allow adequate dwell time (typically 5–60 minutes depending on the defect type, material, and applicable procedure)
3. Remove excess penetrant — for Method A, rinse with water; for Method C, wipe the surface with a lint-free cloth moistened with E-59A — never flood the surface with remover
4. Dry — allow the surface to dry completely before applying developer
5. Apply developer — spray D-70 evenly across the inspection surface from a distance of approximately 30 cm (12 inches) to achieve a thin, uniform coating
6. Inspect — after the recommended developer dwell time, examine the surface under UV-A illumination (minimum 1,000 µW/cm² at the surface) in a darkened environment. Surface-breaking discontinuities will appear as brilliant yellow-green fluorescent indications against a dark background
7. Evaluate and document — evaluate all indications against the applicable acceptance criteria and document findings

Compliance & Standards

All products in the 4016-4 kit meet the requirements of the following codes and standards:

• AMS-2644 — Inspection Material, Penetrant (Qualified Products List)
• AMS-2647 — Fluorescent Penetrant Inspection — Aerospace Applications
• ASTM E165 — Standard Practice for Liquid Penetrant Examination
• ASTM E1417 — Standard Practice for Liquid Penetrant Testing
• ASME Boiler & Pressure Vessel Code — Section V, Article 6
• MIL-PRF-25135 — Inspection Materials, Penetrant

Ideal Applications

• Aerospace component maintenance and overhaul — airframe, engine, and landing gear inspection
• Weld inspection — detection of surface-breaking cracks, porosity, and lack of fusion
• Pressure vessel and piping fabrication quality control
• Casting and forging acceptance inspection — shrink cracks, cold shuts, seams, and laps
• In-service inspection of rotating machinery, shafts, and structural components
• Field inspection requiring a self-contained, portable, ready-to-use kit
• Any application requiring Level 3 sensitivity fluorescent penetrant inspection per AMS-2644, ASTM E1417, or ASME Section V

About Met-L-Chek

Met-L-Chek, a brand of McGean, is one of the most established and trusted names in penetrant inspection materials — with a heritage spanning over 70 years of developing and manufacturing high-quality liquid penetrant testing products for the aerospace, defense, oil and gas, power generation, and industrial manufacturing sectors. Met-L-Chek products appear on the Qualified Products Lists of the world's leading aerospace OEMs and are trusted by NDT professionals on every continent.