semi-conductive shielding material

semi-conductive shielding material, Total:140 items.

The international standard classification for "semi-conductive shielding material" includes: Properties of surfaces , Plastics and rubber insulating materials , Thermoplastic materials , Cables , Other standards related to electricity and magnetism , Radiation measurements , Occupational safety. Industrial hygiene , Electricity. Magnetism. Electrical and magnetic measurements , Electromagnetic compatibility(EMC) .

The Chinese standard classification for "semi-conductive shielding material" includes: Special carbon material , Electrical insulating material and its products , Synthetic resin and plastic , Cable and its accessory , Basic standards and general methods , Radiation protection detection and evaluation , Electromagnetic compatibility , Industrial automation and control device in general , Technical management .

Jiangsu Provincial Standard of the People's Republic of China

DB32/T 3874-2020 General requirements for graphene composite semi-conductive shielding compound for power cables of rated voltages up to and including 35 kV

Military Standard of the People's Republic of China-General Armament Department

GJB 2606-1996 General specifications for military light-transmitting shielding materials
GJB 8820-2015 Method for measuring shielding effectiveness of electromagnetic shielding materials
GJB/Z 158-2011 Data handbook of shielding performance of electromagnetic materials for military equipments
GJB 9258-2017 Specification for conductive fabric for electromagnetic shielding

Military Standard of the People's Republic of China-Commission of Science,Technology and Industry for National Defence

GJB 6190-2008 Measuring methods for shielding effectiveness of electromagnetic shielding materials

Professional Standard - Machinery

JB/T 13536-2018 Measuring method of permeability of electromagnetic shield-absorbing materials
JB/T 13538-2018 Metal coated conductive powder for electromagnetic shielding
JB/T 10738-2007 Semi-conductive shielding compound for power cables of rated voltages up to and including 35kV

Group Standards of the People's Republic of China

T/SHPTA 089-2024 Semi-conductive shielding compound for crosslinked polyethylene insulated cable of rated voltage form 66kV up to 500kV
T/CPCIF 0231-2022 Semi-conductive shielding compound for thermoplastic polypropylene insulated power cables of rated voltage ranges from 6 kV（Um＝7.2 kV）to 35 kV（Um＝40.5 kV）
T/SHPTA 014.2-2021 Modified polypropylene compounds for power cables of rated voltages from 6 kV up to 35 kV―Part 2:Semi-conductive shielding compounds
T/SDAS 243-2021 Semi-conductive shielding material for extruded insulated cables with rated voltage 35kV and below
T/ACCEM 180-2024 Electromagnetic shielding material Carbon nanotube film
T/CSRE 16001-2018 Gadolinium zirconate for nuclear shielding and thermal-insulating
T/SHPTA 032.2-2022 Cross-linkable polyethylene cable compounds for AC 500 kV and below submarine cable for offshore wind power―Part 2:Semi-conductive shielding compounds

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

GB/T 35033-2018 Measurement method on conductive properties of electromagnetic shielding material and bonding impedance of metal material for 30 MHz to 1 GHz
GB/T 26667-2021 Terminology for electromagnetic shielding materials
GB/T 26667-2011 Terminology for electromagnetic shielding materials
GB/T 44645-2024 Measurement method for shielding effectiveness of electromagnetic shielding materials under the excitation of high power microwave
GB/T 25471-2010 Measuring methods for electromagnetic shielding effectiveness of coating
GB/T 30142-2013 Measuring Methods for Shielding Effectiveness of Planar Electromagnetic Shielding Materials
GB/T 34938-2017 General technical requirements for planar electromagnetic shielding materials

Professional Standard - Electron

SJ 20524-1995 Measuring methods for shielding effectiveness of materials
SJ 20673-1998 General specification for military electromagnetic shielding elastomer for gaskets
SJ 20673A-2016 Specification for rubber gasket of electromagnetic shielding

U.S. Military Regulations and Norms

ARMY A-A-52440 A VALID NOTICE 1-2004 COMMERCIAL ITEM DESCRIPTIONS (CIDS) CONDUIT, METAL, FLEXIBLE: ELECTRICAL SHIELDED
ARMY A-A-52440 A-1994 CONDUIT, METAL, FLEXIBLE: ELECTRICAL SHIELDED

Military Standards (MIL-STD)

MIL MIL-DTL-83528/15-2017 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, SHEET STOCK
MIL MIL-DTL-83528/2D-2012 Gasketing Material, Conductive Shielding Gasket, Electrical, O-Ring, Standard
MIL MIL-DTL-83528/2C-2012 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRICAL, O-RING, STANDARD
MIL MIL-DTL-83528/2F-2018 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRICAL, O-RING, STANDARD
MIL MIL-DTL-83528/13G-2019 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, Electrical, EMI/RFI, Waveguide
MIL MIL-DTL-83528/13F-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, Electrical, EMI/RFI, Waveguide
MIL-G-83528B/AMENDMENT-1 Conductive Shielding Gasket Material, Electronic Elastomer, EMI/RFI
MIL MIL-DTL-83528/8F-2019 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Hollow P-Strip
MIL MIL-DTL-83528/4F-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, EMI/RFI, Connector Flange Mount
MIL MIL-DTL-83528H-2018 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, GENERAL SPECIFICATION FOR
MIL MIL-DTL-83528/4G-2018 Gasketing Material, Conductive, Shielding Gasket, Electronic, EMI/RFI, Connector Flange Mount
MIL MIL-DTL-83528/8E-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Hollow P-Strip
MIL MIL-DTL-83528/11E-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Hollow O-Strips
MIL MIL-DTL-83528/7F-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Hollow D-Strip
MIL MIL-DTL-83528/9F-2019 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Solid Rectangular-Strip
MIL MIL-DTL-83528/11F-2018 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Hollow O-Strips
MIL MIL-DTL-83528/9E-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Solid Rectangular-Strip
MIL MIL-DTL-83528/9G-2019 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Solid Rectangular-Strip
MIL MIL-DTL-83528/7G-2018 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Hollow D-Strip
MIL MIL-DTL-83528/3F-2019 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Solid "D" Shaped Strip
MIL MIL-DTL-83528/3E-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Solid "D" Shaped Strip
MIL MIL-DTL-83528/13E-2001 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, ELECTRICAL, EMI/RFI, WAVE GUIDE (SUPERSEDING MIL-G-83528/13D)
MIL MIL-DTL-83528/5E-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, O-Ring, Non-Standard
MIL MIL-DTL-83528/5F-2018 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, O-Ring, Non-Standard
MIL MIL-DTL-83528/2E-2016 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRICAL, O-RING, STANDARD (SUPERSEDING MIL-G-83528/2D)
MIL MIL-DTL-83528/12D-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, Electrical, EMI/RFI, Flat Circular Washer
MIL MIL-DTL-83528/12E-2019 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, Electrical, EMI/RFI, Flat Circular Washer
MIL MIL-DTL-83528/6E-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Rectangular, D-Cross Section
MIL MIL-DTL-83528/6F-2018 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Rectangular, D-Cross Section
MIL MIL-DTL-83528/16-2020 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, CONTINOUS CURED EXTRUSION AND CONTINOUS ROLL SHEETS STOCK
MIL MIL-DTL-13486G-2017 Cables, Special Purpose, Electrical: Low-Tension, Heavy-Duty, Single Conductor and Multiple Conductor, Shielded and Unshielded, General Specification for
MIL MIL-G-83528/2A-1988 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRICAL, EMI/RFI O-RING STANDARD (S/S BY MIL-G-83528/2B)
MIL MIL-DTL-83528/1E-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Circular Strip, .040 through .250 Diameter
MIL MIL-DTL-83528C-2001 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI GENERAL SPECIFICATION (SUPERSEDING MIL-G-83528B)
MIL MIL-DTL-83528G-2017 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, GENERAL SPECIFICATION FOR (SUPERSEDING MIL-DTL-83528F)
MIL MIL-DTL-83528/1F-2019 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Circular Strip, .040 through .250 Diameter
MIL MIL-DTL-83528/4E-2001 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, EMI/RFI, CONNECTOR FLANGE MOUNT (SUPERSEDING MIL-G-83528/4D)
MIL MIL-DTL-83528/8D-2001 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, HOLLOW P-STRIP (SUPERSEDING MIL-G-83528/8C)
MIL MIL-DTL-83528/7E-2001 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, HOLLOW D-STRIP (SUPERSEDING MIL-G-83528/7D)
MIL MIL-G-83528/13D-1994 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, ELECTRICAL, EMI/RFI, WAVEGUIDE (SUPERSEDING MIL-G-83528/13C) (S/S BY MIL-DTL-83528/13E)

American Society for Testing and Materials (ASTM)

ASTM D3004-02 Standard Specification for Extruded Crosslinked and Thermoplastic Semi-Conducting, Conductor and Insulation Shielding Materials
ASTM D3004-08(2020) Standard Specification for Crosslinked and Thermoplastic Extruded Semi-Conducting, Conductor, and Insulation Shielding Materials
ASTM D3004-97 Standard Specification for Extruded Crosslinked and Thermoplastic Semi-Conducting, Conductor and Insulation Shielding Materials
ASTM D6095-05 Standard Test Method for Volume Resistivity for Extruded Crosslinked and Thermoplastic Semiconducting Conductor and Insulation Shielding Materials
ASTM D6095-12(2023) Standard Test Method for Longitudinal Measurement of Volume Resistivity for Extruded Crosslinked and Thermoplastic Semiconducting Conductor and Insulation Shielding Materials
ASTM F763-99 Standard Practice for Short-Term Screening of Implant Materials
ASTM D6095-12(2018) Standard Test Method for Longitudinal Measurement of Volume Resistivity for Extruded Crosslinked and Thermoplastic Semiconducting Conductor and Insulation Shielding Materials

Defense Logistics Agency

DLA MIL-DTL-83528/13 F-2013 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, ELECTRICAL, EMI/RFI, WAVEGUIDE
DLA MIL-DTL-83528/8 E-2013 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, HOLLOW P-STRIP
DLA QPL-83528-QPD-2011 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, GENERAL SPECIFICATION FOR
DLA QPL-83528-QPD-2009 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, GENERAL SPECIFICATION FOR
DLA QPL-83528-41 NOTICE 1-2008 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, General Specification for
DLA MIL-DTL-83528 D SUPP 1-2011 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, GENERAL SPECIFICATION FOR
DLA MIL-DTL-83528/4 F-2013 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, EMI/RFI, CONNECTOR FLANGE MOUNT
DLA QPL-83528-2013 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, General Specification for
DLA MIL-DTL-83528 E SUPP 1-2012 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, GENERAL SPECIFICATION FOR
DLA QPL-83528-2012 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI General Specification for
DLA MIL-DTL-83528 D-2011 GASKETlNG MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI GENERAL SPECIFICATION FOR
DLA MIL-DTL-83528/11 D-2001 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, HOLLOW O-STRIP
DLA MIL-DTL-83528/11 D VALID NOTICE 1-2007 Gasketing Material, Conductive, Shielding Gasket, Electronic, Elastomer, EMI/RFI, Hollow O-Strips
DLA MIL-DTL-83528/9 E-2013 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, SOLID RECTANGULAR-STRIP
DLA MIL-DTL-83528/11 E-2013 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, HOLLOW O-STRIP
DLA MIL-DTL-83528/3 E-2013 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, SOLID 揇?SHAPED STRIP
DLA MIL-DTL-83528/5 E-2013 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, O-RING, NON-STANDARD
DLA MIL-DTL-83528/6 E-2013 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, RECTANGULAR, D-CROSS SECTION
DLA MIL-DTL-83528/12 D-2013 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, ELECTRICAL, EMI/RFI, FLAT CIRCULAR WASHER
DLA MIL-DTL-13486 E-2006 CABLES, SPECIAL PURPOSE, ELECTRICAL: LOW-TENSION, HEAVY-DUTY, SINGLE CONDUCTOR AND MULTIPLE CONDUCTOR, SHIELDED AND UNSHIELDED, GENERAL SPECIFICATION FOR
DLA QPL-83528-41-2005 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, GENERAL SPECIFICATION FOR
DLA MIL-DTL-83528/1 E-2013 GASKETING MATERIAL, CONDUCTIVE, SHIELDING GASKET, ELECTRONIC, ELASTOMER, EMI/RFI, CIRCULAR STRIP, .040 THROUGH .250 DIAMETER
DLA QPL-13486-QPD-2010 Cables, Special Purpose, Electrical: Low-Tension, Heavy-Duty, Single Conductor and Multiple Conductor, Shielded and Unshielded, General Specification for
DLA QPL-13486-30-2006 CABLES, SPECIAL PURPOSE, ELECTRICAL: LOW-TENSION, HEAVY-DUTY, SINGLE CONDUCTOR AND MULTIPLE CONDUCTOR, SHIELDED AND UNSHIELDED, GENERAL SPECIFICATION FOR

ICEA - Insulated Cable Engineers Association Inc.

T-32-645-2012 Test Method for Establishing Volume Resistivity Compatibility of Water Blocking Components With Extruded Semiconducting Shield Materials

Insulated Cable Engineers Association （ICEA)

ICEA T-32-645-2012 TEST METHOD FOR ESTABLISHING VOLUME RESISTIVITY COMPATIBILITY OF WATER BLOCKING COMPONENTS WITH EXTRUDED SEMICONDUCTING SHIELD MATERIALS

ESD - ESD ASSOCIATION

STM11.31-2012 Evaluating the Performance of Electrostatic Discharge Shielding Materials – Bags

American National Standards Institute （ANSI)

ANSI/ESD STM11.31-1994 Evaluating the Performance of Electrostatic Discharge Shielding Materials: Bags
ANSI/ASTM D6095:2012 Test Method for Longitudinal Measurement of Volume Resistivity for Extruded Crosslinked and Thermoplastic Semiconducting Conductor and Insulation Shielding Materials
ANSI/ESD STM11.31-2006 For evaluation the performance of electrostatic discharge shielding materials - Bags
ANSI/ANS 6.4.2-2006 Radiation Shielding Materials, Specification for

American Nuclear Society (ANS)

ANS 6.4.2-2006(R2021) Specification for Radiation Shielding Materials
ANS 6.4.2-1985 Specification for Radiation Shielding Materials
ANS 6.4.2-1985(R2004) Specification for Radiation Shielding Materials
ANS 6.4.2-2006 Specification for Radiation Shielding Materials

ANS - American Nuclear Society

6.4.2-2006 Specification for Radiation Shielding Materials
6.4.2-1985 Specification for Radiation Shielding Materials

Korean Agency for Technology and Standards (KATS)

KS C 0304-1998 Method of measurement for the electromagnetic shielding effectiveness of planar materials
KS C 0304-2014 Method of measurement for the electromagnetic shielding effectiveness of planar materials
KS C 0304-2019 Method of measurement for the electromagnetic shielding effectiveness of planar materials

Australian/New Zealand Standard (AU-AS/NZS)

AS/NZS 1660.2.3:1998/AMD 1:2000 Test methods for electric cables, cords and conductors - Insulation, extruded semi-conductive screens and non-metallic sheaths - Methods specific to PVC and halogen free thermoplastic materials
AS/NZS 1660.2.3:1998(R2017) Test methods for electric cables, cords and conductors - Insulation, extruded semi-conductive screens and non-metallic sheaths - Methods specific to PVC and halogen free thermoplastic materials
AS/NZS 1660.2.3:1998 Test methods for electric cables, cords and conductors - Insulation, extruded semi-conductive screens and non-metallic sheaths - Methods specific to PVC and halogen free thermoplastic materials
AS/NZS 1660.2.2:1998/AMD 1:2001 Test methods for electric cables, cords and conductors - Insulation, extruded semi-conductive screens and non-metallic sheaths - Methods specific to elastomeric, XLPE and XLPVC materials
AS/NZS 1660.2.2:1998 Test methods for electric cables, cords and conductors - Insulation, extruded semi-conductive screens and non-metallic sheaths - Methods specific to elastomeric, XLPE and XLPVC materials
AS/NZS 1660.2.4:1998(R2001) Test Methods for Electric Cables, Cords and Conductors Method 2.4: Insulation, Extruded Semi-Conductive Screens and Non-Metallic Sheaths - Methods Specific to Polyethylene and Polypropylene Materials
AS/NZS 1660.2.2:1998(R2001) Test methods for electric cables, cords and conductors - Insulation, extruded semi-conductive screens and non-metallic sheaths - Methods specific to elastomeric, XLPE and XLPVC materials
AS/NZS 1660.2.4:1998/AMD 1:2001 Test Methods for Electric Cables, Cords and Conductors Method 2.4: Insulation, Extruded Semi-Conductive Screens and Non-Metallic Sheaths - Methods Specific to Polyethylene and Polypropylene Materials
AS/NZS 1660.2.1:1998 Test methods for electric cables, cords and conductors - Insulation, extruded semi-conductive screens and non-metallic sheaths - Methods for general application
AS/NZS 1660.2.1:1998(R2001) Test methods for electric cables, cords and conductors - Insulation, extruded semi-conductive screens and non-metallic sheaths - Methods for general application
AS/NZS 1660.2.1:1998/AMD 1:2001 Test methods for electric cables, cords and conductors - Insulation, extruded semi-conductive screens and non-metallic sheaths - Methods for general application

Institute of Electrical and Electronics Engineers (IEEE)

IEEE 998-2012 Guide for Direct Lightning Stroke Shielding of Substations
IEEE 998-1996 Guide for Direct Lightning Stroke Shielding of Substations

VN-TCVN

TCVN 6730-1-2000 X-Rayshield material.Lead rubber sheet

Society of Automotive Engineers (SAE)

SAE AS25064 Conduit, Flexible, Radio Frequency Shielding
SAE AS25064B Conduit, Flexible, Radio Frequency Shielding
SAE AS25064A Conduit, Flexible, Radio Frequency Shielding
SAE AS25064-1999 Conduit, Flexible, Radio Frequency Shielding FSC 5975
SAE AS25064A-2011 Conduit, Flexible, Radio Frequency Shielding
SAE AS25064A-2016 CONDUIT, FLEXIBLE, RADIO FREQUENCY SHIELDING

U.S. Air Force

AIR FORCE MS20998-1959 BARRIER MATERIAL, GREASEPROOFED-WATERPROOFED, FLEXIBLE

Aerospace Industries Association

AIA NAS52 Conduit/or Assembly/ Electrical, Shielded, Flexible

Electrostatic Discharge Association (ESDA)

ESD STM11.31-2018 For Evaluating the Performance of Electrostatic Discharge Shielding Materials - Bags

IPC - Association Connecting Electronics Industries

IPC FC-222-1980 Specification for Flat Cable@ Round Conductor@ Unshielded

Standard Association of Australia （SAA）

AS 1660.2:1986 Methods of test for electric cables, cords and conductors, Part 2: Insulation, extruded semi-conductive screens and non-metallic sheaths

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