SELECTION 21  600-680℃ High resistant, heat-resistant (borosilicate) glass colors

1. General Information and Color chart

Features!
・Intermixable and high resistant colors. 
・Wide color range for heat-resistant (borosilicate) glass.

SELECTION 21  600-680℃ Intermixable and high resistant heat resistant (borosilicate) glass colors for bottles and glass tableware.

2. Firing Conditions

Normal firing is from 580-650℃ in a cycle of 60-150 minutes, cold-to-cold, with 10 minutes for soaking. The best firing condition depends on firing speed and type of ware and kiln.

3. Application

SELECTION 21 colors are suitable for screen-transfer printing, direct printing, spraying, pad printing and hand painting. SELECTION 21 colors contain lithium oxide. Therefore, it cannot be denied that the internal pressure resistance of the substrate decreases due to the diffusion of lithium.

4. Coefficient of Thermal Expansion (C.O.E.)

If SELECTION 21 colors are applied in very thick layers, the colors could crack or chip off, depending on the type of ware and thickness of the colors. We recommend testing the application of the colors under your conditions before mass production use.

5. Particle size of Distribution (P.S.D.)

6. Printing

【6.1 Mesh size】

We recommend mesh sizes that are 195-305 mesh/inch (77-120 thread/cm) for all screen applications.

【6.2 Medium ratio】

Screen-transfer printing： We recommend PM2 flowing medium, PMT8 thixotropic medium for dot printing. We recommend C12 cover coat by printing 70 mesh/inch (27 thread/cm).
To avoid glass colors absorb any moisture easily. Therefore, keep powder colors in a dry place. We recommend drying the color powder before using.

7. Color and Mixability

SELECTION 21 colors can be mixed with each other in any proportions. However, we recommend testing the stability of mixing colors and overprinted flux colors under end-user’s firing conditions before mass production. Please note following points and refer to Table 1.

Underlay white： 21212 white is suitable as underlay white for all colors.

Mixing white： To obtain pastel-color tone, it is suitable to mix 21212 white.

Mixing flux： 21111 flux is suitable for mixing all colors. After mixing with flux, the color is lighter and glossier.

Overprinting flux： Overprinting 21111 flux can improve color gloss and chemical durability, such as heavy metal release, alkali durability and dishwasher resistance.

AcE flux： To obtain acid etch effect, 21150 AcE flux is suitable.

Iron red： 21601 iron red is not recommended for mixing with cadmium-containing colors.

Cadmium-containing colors *1： 21313 yellow, 21318 orange, 21628 red and 21634 red can be mixed with any other SELECTION 21 colors except 21601 iron red.

Precious metal containing colors ： 21979 purple, 21977 pink, 21973 blue marron and 21974 red marron contain precious metals and they can be mixed with any other SELECTION 21 colors.

8. Chemical durability (refer to the Table 1)

Chemical durability of SELECTION 21 colors depends on type of ware, kiln, color deposit and firing conditions. The following are the results of tests on heat-resistant (borosilicate) glass bottle, fired at 620℃, with 10 minutes of soaking time and 90 minutes of cold-to-cold firing conditions of gas kiln in production.

【8.1 Lead and cadmium release】

According to the DI EN 2188-1-2 test, SELECTION 21 colors show less than lead 0.8 mg/dm2 and cadmium 0.07 mg/dm2 releases.

【8.2 Acid resistance】

According to the DI EN 2188-1-2 test, SELECTION 21 colors do not show any visible attack after immersion in a 4% acetic acid solution for 24 hours at a room temperature of 22±2℃.

【8.3 Alkali resistance】

According to the ASTM C556-88 test, SELECTION 21 colors do not show any visible attack for up to 6 hours.

Overprinting 21111 flux can improve color gloss and chemical durability, such as lead and cadmium release, acid and alkali durability and dishwasher resistance.

9. Safety Data Sheet (SDS)

Safety data sheet (SDS) of SELECTION 21 colors are available on request.

The above information and statements are unsolicited. IZAWA PIGMENT CO., LTD. provides them to promote its products. The above information and statements are also believed to be accurate at the time of publication under their laboratory conditions. Use of them is at the sole discretion of the user and IZAWA PIGMENT CO., LTD. does not give any warranty with respect to any test results. In no event shall IZAWA PIGMENT CO., LTD. be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use of the above information.

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