ANSI ESD-S20.20-2021-EN.pdf - 第18页

ANSI/ESD S20.20- 2021 10 8.4 Packaging A packag ing pla n shall be established to define packaging requ irements, both inside and outside the EPA, per ANSI/ESD S 541 or the contract, purchase ord er, draw ing , or other …

ANSI/ESD S20.20-2021

Technical

Requirement

ESD Control

Item

Product Qualification

Compliance Verification

Test Method

Required

Limit(s)

(8)

Test Method

Required

Limit(s)

EPA

Ionization

ANSI/ESD

STM3.1

Discharge Time

User-defined

ESD TR53

(11)

Ionization

Section

Discharge Time

User-defined

Offset Voltage

(Peak)

-35 volts <

Voffset

< 35 volts

Offset Voltage

(Peak)

-35 volts< Voffset

< 35 volts

Shelving

(9)

(When used

to store

unprotected

ESDS items)

ANSI/ESD

STM4.1

Point to Point

< 1.0 x 10

ohms

ESD TR53

Worksurface

Section

Point to Ground

< 1.0 x 10

ohms

Point to

Groundable Point

< 1.0 x 10

ohms

Mobile

Equipment

(9)

(Working

Surfaces)

ANSI/ESD

STM4.1

Point to Point

< 1.0 x 10

ohms

ESD TR53

Worksurface

Section

Point to Ground

< 1.0 x 10

ohms

Point to

Groundable Point

< 1.0 x 10

ohms

Electrical

Soldering/

Desoldering

Hand Tools

ANSI/ESD

S13.1

Tip to Ground or

Groundable Point

< 2.0 ohms

ESD TR53

Electrical

Soldering/

Desoldering

Hand Tools

Section

Tip to Ground or

Groundable Point

< 10 ohms

Tip Voltage

< 20 millivolts

Tip Leakage

< 10 milliamps

Static Control

Garment

ANSI/ESD

STM2.1

Point to Point

< 1.0 x 10

ohms

ESD TR53

Static Control

Garment

Section

Point to Point

< 1.0 x 10

ohms

Groundable

Static Control

Garment

ANSI/ESD

STM2.1

Point to Point and

Point to

Groundable Point

< 1.0 x 10

ohms

ESD TR53

Groundable

Static Control

Garment

Section

Point

to Groundable

Point

< 1.0 x 10

ohms

For additional information on periodic testing of Ionizers, see ANSI/ESD SP3.3.

ANSI/ESD S20.20-2021

8.4 Packaging

A packaging plan shall be established to define packaging requirements, both inside and outside

the EPA, per ANSI/ESD S541 or the contract, purchase order, drawing, or other documentation

necessary to meet customer requirements. Test methods and test limits required for the various

types of ESD protective packaging used by the Organization per ANSI/ESD S541 are summarized

in Table 4.

Packaging considered 'single use' shall be subjected to the same product qualification and

compliance verification requirements outlined in Sections 7.3 and 7.4 and shall meet the

corresponding test method and test limit requirements of Table 4.

Table 4. Packaging Requirements

Technical

Requirement

ESD

Control

Item

Product Qualification

Compliance Verification

Test Method

Required

Limit(s)

(8)

Test

Method

Required

Limit(s)

Packaging

Conductive

Packaging

ANSI/ESD STM11.11

ANSI/ESD STM11.12

ANSI/ESD STM11.13

< 1.0 x 10

ohms

ESD TR53

Packaging

Section

< 1.0 x 10

ohms

Dissipative

Packaging

ANSI/ESD STM11.11

ANSI/ESD STM11.12

ANSI/ESD STM11.13

≥1.0 x 10

<1.0 x 10

ohms

ESD TR53

Packaging

Section

≥ 1.0 x 10

< 1.0 x 10

ohms

Discharge

Shielding

(Bags Only)

ANSI/ESD STM11.31

< 20 nJ

ESD TR53

Packaging

Section

≥1.0 x 10

<1.0 x 10

ohms

When ESDS items are placed on packaging materials, and the ESDS items have work being

performed on them, then the packaging materials become worksurfaces. The worksurface

requirements for resistance to ground shall apply.

8.4.1 United States Department of Defense (DoD) Packaging Requirements

Department of Defense (DoD) organizations or those performing work under DoD contracts shall

comply with MIL-STD-2073-1 for packaging requirements unless other contractual requirements

apply or are exempt from this requirement based upon application-specific requirements.

8.5 Marking

ESDS items, system, or packaging marking shall be per customer contracts, purchase orders,

drawings, or other documentation. When the contract, purchase order, drawing, or other

documentation does not define ESDS items, system, or packaging marking, the Organization

developing the ESD control program plan should consider the need for marking. If it is determined

that marking is required, it shall be documented as part of the ESD control program plan. If it is

determined that marking is not required, it does not have to be documented as part of the ESD

control program plan.

NOTE: See ANSI/ESD S8.1 for symbols that can be used.

ANSI/ESD S20.20-2021

(This annex is not part of ESD Association Standard ANSI/ESD S20.20-2021)

ANNEX A (INFORMATIVE) – ADDITIONAL PROCESS CONSIDERATIONS

The following sections provide guidance and outline documents available to help the users evaluate

additional control products and equipment. Users need to develop their acceptance and compliance

verification criteria as the industry has not yet defined the required limits for these items.

1. Automated Handlers (ANSI/ESD SP10.1, Automated Handling Equipment [AHE]). To

demonstrate ESD control in automated handling equipment, it may be necessary to measure

resistance to ground of machine components and monitor or verify electrostatic charge on a

product as it passes through the equipment. This can provide both continuous verification of

ESD countermeasures and a method for locating sources of charge generation. This standard

practice covers resistance-to-ground of machine components and sources of charge in

automated handling equipment. For more information on assessing equipment and processes,

see ANSI/ESD SP17.1, Process Assessment Techniques.

2. Gloves (ANSI/ESD STM15.1, Standard Test Method for In-Use Resistance Testing of Gloves

and Finger Cots). This standard test method is intended to provide test procedures for

measuring the intrinsic electrical resistance of gloves and finger cots and electrical resistance

of gloves or finger cots and personnel together as a system. This standard test method applies

to all gloves and finger cots used to control ESD. This standard test method provides data that

is relevant to the user's specific environment and application.

3. Conveyor systems often move unprotected ESD-sensitive items from station to station or

through various process stages such as surface mount technology (SMT) lines, wave solder

machines, and reflow ovens. Currently, no standard exists that addresses the various types of

conveyor systems. Some of the more common systems are flat belt systems, narrow belt

systems (often seen on SMT equipment), roller systems, and brush driven systems. While the

single flat belt systems can often use the same test methods as worksurfaces, the other

systems require different evaluation techniques.

4. ESD Handbook (ESD TR20.20). The ESD Association Standards Committee produced the

ESD Handbook for individuals and organizations faced with controlling ESD. It provides

guidance that can be used for developing, implementing, and monitoring an electrostatic

discharge control program per ANSI/ESD S20.20. This Handbook applies to activities that

manufacture, process, assemble, install, package, label, service, test, inspect, or otherwise

handle electrical or electronic parts, assemblies, and equipment susceptible to damage by

electrostatic discharges greater than or equal to 100 volts human body model (HBM). Charged

device model (CDM) and machine model (MM) factory issues are also addressed.