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Ink characteristics

Water-soluble ink and water-insoluble ink

MEK inks are water-insoluble while MEK free inks are water-soluble.

Differences between water-soluble and non-water-soluble ink

The risk of fire for water-soluble ink is half the risk for non-water-soluble ink.

Specified quantity
Non-water-soluble (MEK ink) 200L
Water-soluble (MEK free ink) 400L

This is because particles with a small relative weight are difficult to dissolve in water. Particles with a low relative weight can then rise to the surface of the liquid, easily flowing out and spreading when water is used to put out a fire on this ink.
* The information shown above is an example of equally hazardous volumes of ink.

Inkjet inks are not subject to the PRTR system

Inkjet inks contain trivalent chromium alloy and toluene, both of which are chemicals listed in Class 1 under the Pollutant Release and Transfer Register (PRTR) law. However, the amount of each of these chemicals is below 1% of the product (ink) mass, which exempts them from being subject to PRTR guidelines.

What are PRTR laws?

(Pollutant Release and Transfer Register)
These are laws related to the necessity of understanding, collecting, and making public data on harmful chemical substances. This data includes the origins of chemical substances, the amount of these substances that have been released into the environment, and whether they have been carried out of industrial facilities as components of waste material.

Inkjet inks are not poisonous or toxic substances under law

MEK (methyl ethyl ketone) is specified as a deleterious substance, but this is not an active ingredient, so the ink is not treated as a deleterious or poisonous substance under the same law.
* Active ingredient refers to substances that are only composed of MEK, so MEK is judged to not be an active ingredient for mixtures such as ink and solvent.

Poisonous and Deleterious Substances Control Law of Japan

This law is aimed at performing the required control of poisonous and deleterious substances in order to maintain sanitation.

Ink ingredients

View the SDS (Safety Data Sheet) for each ink and solvent.

What is an SDS (Safety Data Sheet)?

This is a document that provides information regarding the characteristics and handling of chemical substances that may be hazardous. It is presented when transferring control to another user or when providing a user with a product that includes these chemical substances.
* These were previously referred to as MSDS (Material Safety Data Sheets). However, the name was unified to SDS, which is the abbreviation prescribed by the UN GHS (Globally Harmonized System of Classification and Labeling of Chemicals), in April 2012.

SDS (example)

SDS (example)

SDS contents

    1. 01 Identification of the substance/mixture and of the company/undertaking
      Product identifier as well as the name, address, and telephone number of the supplier of the SDS
    2. 02 Hazards identification
    3. 03 Composition/information on ingredients
      Names of included designated chemical substances as well as classification and content by percentage of designated chemical substances (two significant digits)
    4. 04 First aid measures
    5. 05 Firefighting measures
    6. 06 Accidental release measures
    7. 07 Handling and storage
    1. 08 Exposure controls/personal protection
    2. 09 Physical and chemical properties
    3. 10 Stability and reactivity
    4. 11 Toxicological information
    5. 12 Ecological information
    6. 13 Disposal considerations
    7. 14 Transport information
    8. 15 Regulatory information
    9. 16 Other information

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