Product Data SheetZL-37
Level 4 Post Emulsifiable Fluorescent Penetrant
Essential for critical component applications, ultra-high sensitivity ZL37 post-emulsifiable penetrant is designed for detecting fine, tightdiscontinuities in safety-critical components, such as titanium turbinecomponents, and in high-stress parts, such as investment castings.
This Type 1 penetrant is non-water-soluble so there is minimal risk ofwashing ZL-37 penetrant from a fine or shallow defect which makes thispenetrant inspection the most reliable, dependable form of PT testing.
ZL-37 has a high flash point and provides long tank life when used inopen dip tanks, but this penetrant can also be applied in a variety of other ways, including electrostatic
spray.
ZL-37 can be removed with ZE-4E Method B lipophilic emulsifier or ZR-10E Method D hydrophilic emulsifier.
ZL-37 is listed on the QPL SAE AMS 2644 Qualified Product List and is approved for use by Pratt & Whitney.
BENEFITS
Improve indication detection in the most criticalapplications• Creates the clearest, brightest indications foreven the finest flaws due to very strong UVand thermal stability• Highest fluorescent brightness of any Level 4

penetrant for high-contrast indications that areeasy for inspectors to see – even when theindications are very small• Indications stand out more since background

fluorescence is minimized; emulsifiers only remove
surface penetrant without the risk of over-washing

Wide range of inspections• Inspect a wide range of high-value
components without fear of corrosion or
specification non-conformance• Meets all major industry and NDT specification
requirements, including Aerospace Prime andOEM specs, AMS 2644 and ISO 3452
Revised: December 2020

Maximize penetrant inspection process control• Prevents over-washing since ZL-37 cannot beremoved with water (unless combined with anemulsifier)• PE penetrant system is less susceptible tohuman error since only surface penetrant isremoved in the final rinse stage
Maximize operator comfort and safety• Promotes better inspection quality byproviding the operator with a more
comfortable work environment• Reduces discomfort from strong odors• Exceeds all EHS requirements

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Product Data SheetFEATURES••••
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Level 4 ultra-high sensitivity
Post emulsifiable
Bright, high-contrast indications
Resists over-washing or over-removalHigh flash point
Wide range of application methods
Low odor
Very low toxicity
Alloy compatibility
Very high thermal resistance
Very high UV stability
High dye content
QPL SAE AMS 2644 Qualified Product List
Approved for use by Pratt & Whitney

SPECIFICATION COMPLIANCE

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AECLAMS 2644
ASME BPVCASTM E1417
ASTM E165
Boeing BAC 5423 PSD 6-46 or 8-4Boeing PS-21202
ISO 3452
MIL-STD-2132
MIL-STD-271
Navsea T9074-AS-GIB-010/271
Pratt & Whitney PMC 4354
QPL SAE AMS 2644

PACKAGING
1 gal / 3.78 L, case of 4
5 gal / 18.9 L pail		
20 gal / 75.7 L drum		
55 gal / 208 L drum		

01-3188-35
01-3188-40
01-3188-30
01-3188-45

APPLICATIONSDefect location: open to surface
Ideal for:• Detecting fine to very-fine discontinuities• Precision components• Safety-critical components• Investment castings• High-stress parts• Smooth, machined surface finish• Non-porous surfaces
Defect examples:• Finished surface cracks• Seams• Porosity• Scratches
PROPERTIES
Flash Point> 200°F / 93°CDensity

0.98 g/cc / 8.15 lb/gal

Viscosity (at 100°F/38°C) 13.71 cs
NPE-FreeYes

USE RECOMMENDATIONSNDT Method

Penetrant Testing,Fluorescent

Type

1Method(s)B/C/DSensitivity Level4, ultrahigh sensitivity

Required Equipment

UV light source

Usage Temperature

40 to 125°F / 5 to 52°C

Storage Temperature

50 to 86°F / 10 to 30°C

HEALTH AND SAFETY
Review all relevant health and safety information
before using this product. For complete health andsafety information, refer to the product Safety Data
Sheet, which is available at www.magnaflux.com.
Revised: December 2020

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