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Anti-static Bag

Anti-static bag used in laboratory

1. What is anti-static bag?
    1.1 What is static electricity?
    1.2 What is ESD?
    1.3 Feature of anti-static bag
2. Classification of anti-static bag
3. Anti-static packaging bag selection principles
4. How to buy anti-static bag?

What is anti-static bag?

Usually, ordinary plastic bags for daily use are generally made of insulating materials. The bag containing sensitive devices are designed to be made of anti-static substances, generally called anti-static bag. It can also be called anti-static shielding bag, silver gray transparent static bag, and anti-static moisture-proof bag.

Anti-static shielding bag has composite product performance. It is widely used in all kinds of pc boards, computer motherboards, sound cards, graphics cards, network cards, and electrostatic-sensitive high-tech electronic products packaging. Anti-static packaging material is made of multi-layer material by compound coating. The inner layer is the heat-sealing layer, the sealing strength of the product is twice as high as the general material sealing strength. The middle layer is the high-strength mechanical layer, with excellent mechanical function. The outer layer is the conductive layer. The material is compatible with the relevant chemical products and has good performance. It does not react chemically with the packaged products during the packaging and storage process and can be used directly in the contact packaging of related products.

Anti-static bags can maximize the protection of electrostatic sensitive components from potential electrostatic hazards. Their unique Faraday electric cage structure forms an "induction shield" effect to achieve a shielding and anti-static effect on the contents of the bag. Wear-resistant metal coating on the outside and vinyl on the inside. It has been processed by a complex process to achieve the best possible electrostatic shielding protection. The translucent heat-sealed bag type process allows clear identification of bag contents.

Anti-static bags are suitable for packaging various circuit boards, electronic products, precision machinery parts, consumer goods, industrial products, etc. For example, PC boards, IC integrated circuits, electronic components, precision hardware, auto parts, and another packaging.

What is static electricity?

Static electricity is a static charge, which is the result of uneven distribution of electrons and is mainly generated by friction. It can also be generated by electric field induced, direct charging, etc. So the generation of static electricity is divided into friction-induced and induction-induced electricity.

The electric charge is stable under two conditions as follows.

a. When static electricity passes through objects that are electrically conductive but are electrically insulated. For example, a screwdriver with a plastic handle that is metal.

b. When static electricity adheres to an insulating surface (such as plastic) and cannot flow over it. However, if an electrically insulated conductor (screwdriver) with a sufficiently high charge is close to an integrated circuit (IC) with an opposite potential, it will cause an electrostatic discharge (ESD). At very high intensities, ESD occurs very rapidly. Typically, ESD will generate enough heat to melt the internal circuitry of a semiconductor chip, resembling a small bullet hole blown outward under an electron microscope, causing immediate and irreversible damage. And more seriously, only one in ten cases of this hazard is bad enough to cause the failure of the entire component in the final test. In the other 90% of cases, ESD damage causes only partial degradation. It can pass the final test unnoticed, with only premature field failures occurring after shipment to the customer.

What is ESD?

Electro-static discharge (ESD) usually refers to the phenomenon of discharge after the energy of the electrostatic field reaches a certain level and breaks through the medium between it. The principle is the transfer of electrostatic charge between objects with different electrostatic charge potentials due to direct contact or electrostatic induction caused by the objects.

Feature of anti-static bag

a. Prevention of the generation of electricity by friction.

b. Protection from electrostatic fields.

c. Prevent direct discharge from contact with the charged human body or with charged objects.

Note: It is difficult to make a material with all the above properties, and often requires a combination or compound of different materials to achieve the required purpose. Any material that can limit electrostatic charge build-up or can be protected from external electrostatic charges by safely dissipating electrostatic charges or shielding parts can be used as ESD protective packaging materials.

Classification of anti-static bag

A. Different anti-static bags according to the material cited classification

a. PE anti-static bags
b. Shielding anti-static bags
c. Aluminum foil anti-static bags
d. Grid anti-static bags
e. Bubble anti-static bags
f. Pearl cotton anti-static bags
g. Composite anti-static bags

B. Different anti-static bags classification by structure

a. Anti-static PE bags

Anti-static PE bags are inexpensive products, which are made of low-density polyethylene (LDPE) + linear low-density polyethylene (LLDPE) + anti-static masterbatch + color masterbatch + stabilizer mix blow molding, and then cut off and heat seal molding. It has all the characteristics of ordinary PE bags and anti-static function. The material has a softer feel and the thickness can be freely adjusted. It is widely used in printed circuit boards and other general electronic products. As an external packaging, it can save costs and protect electronic products will not due to mutual friction between insulators and electrostatic damage to electronic components.

b. Anti-static bags

Anti-static bags can effectively isolate the items and the external electrostatic field, to prevent static electricity generated inside the bag, protect household goods from electrostatic hazards, and also anti-electromagnetic interference.

Anti-static bags can be subdivided into shielding anti-static sealed bags, PE red anti-static bags, anti-static shielding bags, anti-static bubble bags, and anti-static moisture-proof bags.
a) Shielding anti-static sealed bag
Shielding anti-static sealed bag is made of polyethylene-based and anti-static agent, and then blow-molded by special machinery. It is easy to pack and close together with a pinch of a finger. The surface resistance value is 109-1011Ω.
b) PE red anti-static bag
The anti-static bag is the best packaging material for printed circuit boards so that the electrostatic generation of printed circuit boards can be reliably released to avoid damage.
c) Anti-static shielding bag
To make the plastic shield electromagnetic waves, it is necessary to use an antistatic agent to metalize the plastic, which has a good shielding effect. Surface resistance: 106Ω-109Ω.
d) Anti-static bubble bags
Both anti-static bubble bags and bubble sheets can prevent products from damage caused by collision or static electricity during production, handling, and transportation. These bags are suitable for packaging electronic products that are sensitive to static electricity.
e) Anti-static and moisture-proof bags
Anti-static and moisture-proof bags are a kind of silver-white packaging bags suitable for the transportation and packaging of PCB, IC, and other static-sensitive high-tech electronic products with anti-static and moisture-proof functions. Their inner and outer layers are composed of transparent anti-static material, and the middle layer is aluminum foil with excellent barrier and conductivity. Thus, this kind of bag has good anti-static, moisture-proof, and electromagnetic shielding properties. Anti-static moisture-proof bags are mainly used in the packaging of electronic products that are static sensitive and need moisture-proof and electromagnetic interference at the same time.

C. Anti-static aluminum foil bag

Anti-static aluminum foil bags are referred to as aluminum foil bags. This anti-static bag has the unique physical properties of aluminum. It has a light and shiny formation and strong reflectivity. It can be used as thermal insulation packaging, with a good barrier, impervious to gas and water vapor, strong adaptability to temperature, stable shape at high or low temperature, excellent light shielding, fragrance preservation, and other characteristics. After laminated with other high-barrier materials in multiple layers, aluminum foil bags have good moisture resistance, barrier, light avoidance, permeability resistance, and beautiful appearance.

D. Anti-static grid bag

Anti-static grid bag is made of LDPE blown film and printed black conductive polyethylene material, so it has a very good static discharge performance. Black conductive bags and the accumulated charge on the workpiece can be well discharged through the bag, so it will not generate static electricity due to friction during production and transportation.

Anti-static packaging bag selection principles

The selection of anti-static packaging materials should be based on the product's electrostatic protection principle, product characteristics, and the use of different methods and focus.

A. Prevention of charge dissipation and frictional charging

If contact with ESDS products is required, packaging materials (including fillers) should be static dissipative or materials that are less likely to generate static electricity.

B. Measures for electrostatic shielding

When handling and storing products outside the ESD protection work area, ESD products should be encapsulated in a conductive and electrostatic shielding packaging container. The outer packaging box should generally be well shielded and surface conductive metal box, the shell can be the solid-core type or non-solid-core type (such as metal mesh).

C. Grounding the package

When wrapping or encapsulating ESDS products, all indirect packaging materials should be able to dissipate electrostatic charges in the ESD protection work area (with grounding measures).

D. Maintain the anti-static properties of materials

In the delivery, packaging, storage, and transportation stages of ESDS products, packaging materials that are often used or reused should be checked frequently for their antistatic properties such as static dissipation, shielding properties, and frictional charging properties to keep them unchanged.

How to buy anti-static bag?

ANTITECK provide lab equipment, lab consumable, manufacturing equipment in life sciences sector.
If you are interested in our anti-static bag or have any questions, please write an e-mail to [email protected], we will reply to you as soon as possible.

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