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You are here: EPA Home » DfE » Bulletin 4 - Traditional Screen Reclamation System vs Alternative System

Bulletin 4 - Traditional Screen Reclamation System vs Alternative System


Chemical Composition
Traditional System Alternative System Chi

Ink Remover

100% Lacquer thinner, consisting of:
30% Methyl ethyl ketone
20% Naphtha light aliphatic
20% Toluene
15% n-butyl acetate
10% Isobutyl isobutyrate
5% Methanol

Diethylene glycol series ethers
Propylene glycol series ethers
N-methyl pyrrolidone
Ethoxylated nonylphenol

Emulsion Remover

1% Sodium periodate
99% Water

Sodium periodate
Water

Haze Remover

10% Xylene
30% Acetone
30% Mineral spirits
30% Cyclohexanone

Diethylene glycol series ethers
Propylene glycol series ethers
N-methyl pyrrolidone
Ethoxylated nonylphenol
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Health Risks1
Traditional System Alternative System Chi

If you use the ink or haze remover on a regular basis, there is a clear concern for harmful health effects from inhaling the chemicals (specifically toluene, methyl ethyl ketone, and acetone).

There is also a clear concern for adverse health effects if your skin contacts the ink or haze remover on a daily basis (also from toluene, methyl ethyl ketone, and acetone). The concern is marginal for contact with cyclohexanone in the haze remover. If gloves and safety goggles are worn, the risk is negligible.

There is a clear concern that regular, unprotected contact with the emulsion remover will cause skin and eye irritation and tissue damage. If gloves and safety goggles are worn, the risk is negligible.


Inhalation risks of the ink and haze removers are negligible.

If you use the ink or haze remover on a daily basis without wearing gloves, there is a clear concern for harmful effects from diethylene glycol series ethers absorbed through your skin. If gloves are worn, the risk is negligible.

If your skin regularly contacts the ink or haze removers, there is a concern for reproductive toxicity risk from absorbing N- methyl-pyrrolidone. If gloves and safety goggles are worn, the risk is negligible.

There is a clear concern that regular, unprotected contact with the emulsion remover will cause skin and eye irritation and tissue damage. If gloves and safety goggles are worn, the risk is negligible.

  1Clear concerns > Marginal concerns > Negligible concerns. Concerns were identified because exact risks were not calculated. The information in this table is based on the September 1994 draft Cleaner Technologies Substitutes Assessment: Screen Printing Technical Report.
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Performance
Traditional System Alternative System Chi

Ink Remover

With solvent and UV inks, it removed the ink with moderate scrubbing effort. A gray haze remained on the entire screen. With water-based ink, the ink solidified.

In on-site demonstrations, removed ink well. One of the facilities found it worked very well on metallic inks. In lab testing, dissolved UV-curable ink well. Two applications were needed to remove the solvent-based ink.

Emulsion Remover

Not demonstrated2

Quickly and easily removed the stencil during facility demonstrations and lab tests.

Haze Remover

Not demonstrated2

At Facility C, the haze remover lightened moderate stains, but was not effective on heavy stains. At Facility D, haze remover was not needed. In lab testing, the haze remover lightened the ink stain.
  2The ink remover was demonstrated during laboratory tests as a component of a different reclamation system.

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Cost
Traditional System Alternative System Chi

$6.27/screen or $9,399/year

Facility C: $3.89/screen or $5,829/year

Facility D: $3.25/screen or $4,879/year


[ Back to Bulletin 4 ] [ Back to Top ] [ Chemical Composition ] [ Health Risks ] [ Performance ] [ Cost ]

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