Welcome to Conductivebags2u.co.uk
If you want to know what conductive bags are, what it is used for and where to buy conductive bagsyou came to the right place answer to all your questions about conductive bags and static sheilding bags are here.
What are conductive bags?
Transparent pink bag that protects sensitive electronics from damage caused by the harmful effects of static electricity. Static travels around the bag and dissipates before it has a chance to damage contents when shipping or storing. These bags are usually plastic and have a distinctive color: silver for metalized Mylar and other similar plastics and pink or black for polyethene.
Types of conductive bags
Flat Anti-Static Poly Bags
Protect electronic components from static build-up. Constructed from pink anti-static polyethylene film. Keeps products clean and moisture free.
Anti-Static Poly Tubing
Make your own anti-static poly bags. Excellent resistance to static discharge. Static dissipative, non-corrosive pink polyethylene is heat sealable. Seal with Poly Tubing Sealers.
Gripseal/Zipper conductive bags
The same properties as the Open Top(Flat) Pink Poly Bag plus the security and convenience of a zipper top. The zipper top closes securely to protect against damage from dust and moisture.
Anti-Static Bubble Bags or Bubble pouchesProvides maximum protection against static discharge for circuit boards, relays, switches, resistors, controls and other static sensitive electronic components - Apply your own labels. 3/16" bubble coated with a nylon barrier provides outstanding cushioning. 1" pressure sensitive lip covered with release paper allows for easy closing.
Features & Benefits of Conductive Bags
- Perfect for packging, storing and shipping non-sensitive and sensitive electronic components
- Simple design and practical construction
- Conductive agent or material on/in film
- Eliminates the hazard of static damage - prevents the generation of static electricity
Question & Answer on conductive Bags
Question. I have two questions about one material. Anti-stat bags.
1. How effective are anti-stat bags with a relative humidity of less than 20 % and temperatures as high as 110 degrees Fahrenheit.
2. How do you put a spec on an anti-stat (ohms/sq. etc.) bag to ensure maximum protection and re-use?
Answer.The clear static dissipative polyethylene (PE) that high quality vendors use in their bags is far superior than the "topically treated washed" pink poly products.
Dissipative and metallized shielding bags are made with volume loaded polyethylene which cannot be washed off and is inherent in the film. The PE resin that we use and all the additives are developed to minimize contamination.
The conductive dissipative clear bags are pre-conditioned and tested at both 50% and 12.5% RH levels to have a surface resistivity of less than 1x10^11 ohms. (old nomenclature = ohms/square)
You can perform two test to ensure the proper operation of the bags:
1. perform a resistance test on the bag film to < 1x10^11 ohms @100 volts [using two five pound electrodes and megohmeter per esd s11.31-1994 and esd ds20.20-1998]
2. perform a tribocharge test, yielding static decay of less than or equal to 140 milliseconds, per FTMS 101C, Method 4046
Question. What is the recommendation or guidelines in determining when conductive shielded bags are no longer any good, i.e. crinkled or have small puncture holes, and put out of service?
Answer.All your answers are in the MIL-B-81705C Standard document. Specifically, an anti-static shielding bag (type III) can be considered no good if it meets any of the following conditions:
- the bag delaminates as defined in section 22.214.171.124 in MIL-B-81705C
- has a static decay rate exceeding 2.0 seconds
- does not attenuate EMI at least 10 dB
- punctures over 6.0 lbs
- doesn't shield an ESD event under 30 kilovolts
- and has a surface resistivity greater than 1x10^12 ohms/sq both inside and out and less than 1x10^5 ohms/sq on the inside.
In general, a metallized shielding bag may still shield if it has crinkled or acquired small holes because of the Faraday affect, but it is safer to discard these bags and err on the conservative side. It would probably cost more to test and qualify the bag then to replace it.
Question. In my company many rolls of bubble wrap, plastic bags, and PCB boxes (plastic cases) are listed as "Anti-static". While we all understand that these items will not produce serious static, many think that they will also protect the components inside from a static charge. My contention is that a significant amount of charge would pass through the bag/box and damage any ESDS item inside. Only a shielded bag would guarantee complete protection from ESD. The question really arises because a well-known and respected PCB manufacturer sends their PCBs� to us in anti-static plastic cases. The clear plastic case only lists "Anti-Static and we can not see any conductor strands within the plastic. What are your thoughts?
Answer. There are two ways to protect ESDS PCBs. One way is by shielding. The use of metallized shielding bags is a good way to protect the contents from external ESD. Another way to protect ESDS PCBs is to isolate them from external ESD with an air gap. There are "clam shell" packaging and other anti-static plastic packages that will give a spacing of about an inch of air between the outside plastic shell and the ESDS part inside. This "air gap" spacing can be an effective way to protect ESDS parts from external ESD as a 1" air gap acts as a dielectric to prevent discharges up to 30 kilovolts.
How to measure conductive bags?
Types of ESD bags
There are essentially three types of ESD bags: conductive bags, dissipative bags and metallized bags. The latter two categories are typically the high-end of ESD bag product offerings and tend to have three combined properties of protection, (1) conductive, (2) dissipative and (3) shielding.
- Conductive Bags
Conductive bags are usualy coated with a topical antistatic agent that helps minimize the generation of a static imbalance from triboelectric generation or contact and separation (i.e., definition of conductive). Conductive bags are made with an antistat built into the films layers. A good bag has conductive properties on both the inside and outside of the bag�s film construction.
- Dissipative Bags
Bags with the films surface resistance in the dissipative range are preferred because charge dissipates across the surface at a controlled rate. Most dissipative bags also have the property of being conductive. These are good general bags to be used in non-critical environments.
- Shielding Bags
Metal-In static shielding bags offer superior durability at a low cost. Enhanced durability is obtained with the metallized layer buried between the polyester and the polyethylene layers of the metal-in shielding. The metal-in layer prevents the penetration of damaging electrostatic fields. Tribocharging is minimized by specially processed, non-static-generating polyethylene. This type of bag is recommended when packaging static sensitive components.
Please visit www.antistatic-bags.co.uk for antistatic bags.