Ströbel » FAQ

Glossary, FAQs and useful information

Please do not hesitate to get in touch if you have any further queries or requests. Just call us or use our contact form.


» Shipping costs

We use the least expensive shipping method. Shipments weighing up to 30 kilograms are sent via a parcel service, for which the charge is €5.90 per carton. If necessary, shipments are divided into two or three boxes. Palettes are shipped via a freight forwarder, whose charges are passed on to the customer. Shipping is free for orders amounting to more than €260.

LDPE film

» LDPE film

LDPE is low density (LD) polyethylene (PE) film that is softer than HDPE film. This makes it easier to process, and it is more commonly used for industrial applications.


Stands for Deutsches Institut für Normung e. V., which is Germany’s national standards organization. Our 100 and 200 micron LDPE films meet TL 8135-0019 requirements. They are tested in accordance with TL guidelines and thus meet TL and DIN 55530 requirements, which call for maximum strength tolerance of plus or minus 5 percent.

» TL

TL stands for the technical shipping conditions of the German military. Our 100 and 200 micron LDPE films meet TL 8135-0019 requirements. They are tested in accordance with TL guidelines and thus meet TL and DIN 55530 requirements, which call for maximum strength tolerance of plus or minus 5 percent.

» Regenerated film

Regenerated film is composed of recycled PE granulate and in most cases is colored by adding red or green granulate. This has no impact on the film’s technical properties. Regenerated film is mainly used for covering or dust protection purposes.


» What is the shelf life of desiccants?

Approx. 1 year if stored in a cool and dry place in their original packaging.

Aluminum composite film

» “Starry sky”

A “starry sky” results from crimping aluminum composite film. The aluminum in the composite is fractured at various places, and these fractures catch the light. This phenomenon has no impact on the barrier layer properties of the product.

» Thermal transfer printing

In thermal transfer printing, the image is printed by generating heat at various points via mechanical force or pressure. Thus the bags can only be printed in monochrome. Maximum image size: 10 x 15 cm.

» Heat embossing

In heat embossing, the bag is imprinted mechanically using a heated printed plate and an ink ribbon. Thus the bags can only be printed in monochrome. Maximum image size: 6 x 8 cm.

» How long can I store my products which are packaged in aluminum composite film?

If properly packaged in aluminum composite film, desiccants protect the packaged goods for up to ten years. It is of utmost importance that the packaging remains completely watertight and water vapour resistant throughout the transit and storage phase. It should be noted in this regard that if the packaging is opened by customs officials or the like and is not resealed properly, the packaging completely loses its protective effect.


» Is it necessary to use desiccant bags with VCI methods?

Inasmuch as VCI film does not protect against moisture, external moisture is constantly absorbed. As a result, desiccant bags would become saturated very quickly and would lose their moisture absorption properties. Hence there is no protective effect.

» Can carriers be used more than once?

 No, because there is no way of telling how many active substances are present.

» How long does the VCI protection last?

Moisture protection lasts for up to six months for products stored out of doors, and for up to 24 months for indoor storage.

» Can VCI packaging be reopened?

Yes, briefly. The protection regenerates once the package is re-closed.

» How long does it take for a protective VCI atmosphere to form?

It takes a maximum of 24 hours for a fully functional protective atmosphere to form.

» How much VCI agent is needed?

The VCI agent exerts its effect in a radius of around 30 cm. Additional VCI products such as impregnated paper or Daubrite VCI disk emitters must be added to larger packages. Rule of thumb: One square meter of VCI film provides protection for one to three square meters of metal surface or one cubic meter of packaging space. For optimal effect, the metallic elements should be as close as possible to the VCI film.

» How does VCI corrosion protection work?

The anti-corrosion effect of a VCI kicks in once the VCI agent that is incorporated into the carrier begins volatilizing. The agent deposits an anti-corrosion film on the packaged products – which must, however, be ultra clean. Hence packaging workers should wear gloves at all times, since any residue on the products will severely impair the formation of a protective atmosphere.

» Which materials are protected by VCI films?

VCI films provide protection for virtually all metallic elements. However, for certain special alloys it is advisable to conduct tests to ensure that these films do in fact provide the requisite protection.

» Can two or more VCI agents be used in conjunction with each other?

No, as this could potentially impair the protective effect. Manufacturers accept no responsibility for any damage resulting from such use.

» Do parts need to be cleaned after being unpacked?

No, because the VCI agent vaporizes once the package has been opened and leaves no residue.

» Are VCI carriers effective on one side or both sides?

Normally they are effective on both sides. Unilaterally effective carriers are normally imprinted with the following advisory: “Other side facing the metal.”

» What is the shelf life of VCI products?

Up to five years, in their unopened original packaging.


» Volume conductive film

Black-colored volume conductive films acquire their properties from the use of carbon additives (soot). The surface resistance of these films ranges from 104 to 105 ohms. Hence these films should only be used for low-sensitivity components, as they are permeable to voltage spikes.

» Which types of ESD protective packaging are available?

  • Shielding packaging (tosphield, EMI-Shielding), marked "S" (Shielding)
  • Dissipative packaging (low charging or pink antistatic), marked "D" (Dissipative)
  • Conductive packaging, marked "C" (Conductive)

» Electrostatic discharge (ESD)

ESDs can provoke considerable damage in microelectronic components. For example, a static discharge in a semiconductor can provoke as much damage as a lightning strike in a tree.


ESDS stands for electrostatic sensitive devices.

» What’s the difference between shielding and EMI shielding film?

Shielding film is a metallicised product that is coated with aluminum and is thus slightly transparent. EMI shielding film is opaque and impermeable to moisture and provides outstanding protection against moisture and electrostatic charging. The use of desiccants in combination with humidity indicator cards allows for the adsorption of humidity. EMI shielding film can be vacuumized and complies with IPC/ JEDEC.

» "topshield" metallicised shielding bags

Metallicised shielding bags shield against and dissipate electrostatic discharges, and are particularly suitable for shipping and storing highly sensitive electronic components and circuit boards. These bags provide Faraday Cage protection against voltage spikes. Surface resistance: 1010 to 1011 ohms. Energy bag test <0,5nJ.

» What is the shelf life of shielding and EMI shielding bags?

Under normal storage conditions in the original packaging, up to 12 months without any loss of protective properties.

Origin of goods and trade preferences

» What is the advantage of exporting preferential products that come from the European Union?

These products are subject to economic advantages over so called third-country goods.

Does this mean that preferential law provides a competitive edge?

For sure! These advantages take the form of customs tariff preferences, which means that the import duties on the relevant products are reduced to a low level or to zero. This in turn lowers the price for the purchaser, thus providing a competitive advantage.

» Long Term Supplier Declaration

The long term supplier declaration represents formal proof of a product’s having originated in the European Union. For further information concerning the origin of goods and trade preferences, see:

» Issuance of certificates of preferential origin and associated risks

Any failure to comply with the so called “origin rules” that come into play here, or making a false statement on a certificate of preferential origin, results in the purchaser’s import duties being unduly low. Any such nonconformance will come to light during a customs audit and constitutes a violation of tax regulations on the part of the party that issued the certificate in question. Customs tariff preferences are only granted if the relevant requirements are met.

Should such a high risk be incurred even though it’s unnecessary? Absolutely not.

The customs duties in many importing countries are already so low (or are nil) that no preference is necessary or comes into play. For further information in this regard, see: » Market Access Database (external Link)

» Import duties to be paid by the receiving State of your export goods

Due to the risks entailed by false statements concerning the origin of goods, we recommend that you assess the requisite expenditures from an economic standpoint.

The customs duties in many importing countries are already so low (or are nil) that a certificate of preferential origin is not required and does not lead to an additional economic advantage for your customer.

Look up your product in the » Market Access Database which is an extremely useful tool for mapping out European Union market access strategies. (external link to the official website)