PartsTable
Technical Data Sheet
MIL-B-121 ✓ Verified by PartsTable
· COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

BARRIER MATERIAL,GREASEPROOFED,F. Key specifications include width: 36.000 INCHES NOMINAL IN, length: 300.000 FEET NOMINAL FT, physical_form: ROLL, moldable_feature: NOT INCLUDED, performance_type: HEAVY DUTY, surface_condition: SMOOTH. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 8135-00-132-9589, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MIL-B-121
NSN: 8135-00-132-9589
FSC: 8135
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
width36.000 INCHES NOMINAL IN
length300.000 FEET NOMINAL FT
physical_formROLL
moldable_featureNOT INCLUDED
performance_typeHEAVY DUTY
surface_conditionSMOOTH
supply_package_typeROLL
identification_code_colorANY ACCEPTABLE
nondefinitive_spec/std_dataI TYPE AND A GRADE AND 2 CLASS
self-adhering_material_locationNONGREASEPROOF SIDE
NSN8135-00-132-9589
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available BARRIER MATERIAL,GREASEPROOFED,F TITLE COMPONENT PN MIL-B-121 MFR BARRIER MATERIAL,GREAS
KEY FEATURES
SURFACE CONDITION: SMOOTH
SUPPLY PACKAGE TYPE: ROLL
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 2 CLASS AND A GRADE
SELF-ADHERING MATERIAL LOCATION: GREASEPROOF SIDE
MOLDABLE FEATURE: NOT INCLUDED
IDENTIFICATION CODE COLOR: RED
WIDTH: 3.000 FEET NOMINAL FT
LENGTH: 600.000 FEET NOMINAL FT
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE CONDITIONSMOOTH
SUPPLY PACKAGE TYPEROLL
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 2 CLASS AND A GRADE
SELF-ADHERING MATERIAL LOCATIONGREASEPROOF SIDE
MOLDABLE FEATURENOT INCLUDED
IDENTIFICATION CODE COLORRED
WIDTH3.000 FEET NOMINAL FT
LENGTH600.000 FEET NOMINAL FT
PERFORMANCE TYPEMEDIUM DUTY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
MIL-B-121Interchangeable
interchangeable cross-reference
interchangeable
8135-00-222-4027Interchangeable
interchangeable cross-reference
interchangeable
MS20998Interchangeable
interchangeable cross-reference
interchangeable
PK-18Interchangeable
interchangeable cross-reference
interchangeable
MIL-PRF-121GInterchangeable
interchangeable cross-reference
interchangeable
8135PL0907957Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-B-121?
MIL-B-121 is a BARRIER MATERIAL,GREASEPROOFED,F.
What parts can replace MIL-B-121?
There are 23 known substitutes for MIL-B-121: MIL-B-121, 8135-00-222-4027, MS20998 and 20 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-B-121?
MIL-B-121 is cataloged in the Federal Logistics Information System (FLIS) under NSN 8135-00-132-9589. This indicates validated use in U.S. government and defense supply chains.
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