Technical Information

35M51 Gray and 35M52 Black

Revised: 6/4/2012

800-880℃

Lead- and cadmium-free onglaze metallic colors
1. General Information and Color chart
New development of 35M51 gray and 35M52 black (SELECTION 35M series) are lead-and
cadmium-free, intermixable, intensive onglaze metallic colors for hard porcelain, porcelain, bonechina, earthenware, vitreous china and enamel ware.
These color shade cannot be achieved by mixing onglaze gray or black and silver metallic.
They show very unique color tone especially on colored glaze and look iron and platinum shade.
Options for this series: Please refer to their individual technical information.
SELECTION 35M: Metallic and interference metallic colors.
SELECTION 35 and 36: Lead-and cadmium-free colors.
SELECTION 34: Lead- free cadmium containing colors.
SELECTION 35 Relief: Relief flux and white.

Features!
・Very intensive gray and black tone
・Low C.O.E.
・Lead and cadmium free・Can overprint and mix with other normal colors and metallic colors

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Revised: 6/4/2012

2. Firing Conditions
Type of ware

35M51, 35M52

Hard porcelain

820-880℃

Porcelain820-880℃

Bone china

800-880℃

Earthenware

760-840℃

Vitreous china

800-880℃

Enamel ware

800-830℃

35M51 gray and 35M52 black are suitable for both normal firing of 3-10 hours and fast firing of 60-120
minutes, cold-to-cold conditions. They should also be only used with lead-and cadmium-free colors andglazes. They must be fired only under lead-and cadmium-free conditions to avoid heavy lead and cadmium
release.
Interference metallic colors are recommended to fire fast-fire condition and lower temperature than theother metallic colors to avoid losing the interference effect.

3. Application
35M51 gray and 35M52 black are suitable for screen-transfer printing, direct printing, spraying, pad printing
and hand painting.
Both of the 35M51 gray and 35M52 black show interesting effect not only color itself but also show
excellent effect by mixing with other colors, overprinting on relief and underlay colors.

4. Coefficient of Thermal Expansion (C.O.E.)
Product
35M51, 35M52

Thermal Expansion (C.O.E.)(average)

35103 overprinting flux

between 6.8-7.3×10-6/℃
4.3×10-6/℃

35M51 gray and 35M52 black are carefully developed and tested under optimum conditions to minimize
cracking or chipping problems. The maximum thickness of the color layer should be bellow 20μm (approx. by
200 mesh/80T, double printing) for porcelain glaze (C.O.E. 4.0-5.0×10-6/℃).
Thicker printing of more than 25μm could be allowed for bone china, earthen ware and vitreous china (C.O.E.
5.5-7.5×10-6/℃) However, it is necessary to test the cracking or chipping before mass production. The
results will depend on the end-user’s conditions.

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Revised: 6/4/2012

5. Particle size of Distribution (P.S.D.) and Printing【5.1 Mesh size】
35M51, 35M52
Appearance

Intensive and high metallic effectParticle size

Average 12-18μm, biggest 60μm

Mesh size (polyester)

100-200 mesh/40-80T【5.2 Medium ratio】
35M51, 35M52 : Medium PM2

10 : 11-13

35103 overprinting flux : Medium PM2

10 : 9-11

Screen-transfer printing： We recommend PM2 flowing medium for printing 35M51 gray and 35M52 black.
We recommend PM2 flowing medium for printing 35103 flux. We recommend C12 cover coat by printing 70
mesh (27T).
We recommend adding a little more medium for fine particle-color range to get a better homogenous of paste
because the gravity of fine-particle colors is lighter than rough-particle colors. If the ink is not a good
homogeneous paste, the color will dry on the screen during printing and, after firing, the gloss will becomeworse.
Lead-and-cadmium free onglaze colors absorb any moisture easily. Therefore, keep powder colors in a dryplace. We recommend drying the color powder before using6. Color and Mixability
35M51 gray, 35M52 black and the other SELECTION 35M can be mixed with each other in any proportions.
Mixing with other SELECTION 35 colors can be developed a wide range of metallic effect colors. Please notethe following recommendations.
Mixing white silver： To obtain lighter gray tone, mixing 35M51 gray, 35M52 black with 35M11 or 35M12
white silver are recommended. 35M13 is not recommended because after mixing the tone become redder.
Underlay colors： Any of SELECTION 35 colors and 35M metallic colors can be printed as underlay colors.
35703 black is recommended as underlay black. If the underlay colors are over fired they lose the metallic
effect. In this case, we recommend firing lower.

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Revised: 6/4/2012

Relief effect： Mixing 35M51 gray and 35M52 black with 35180 relief flux or 35286 relief white can be
developed relief metallic colors. Overprinting 35M51 gray and 35M52 black on 35180 relief flux or 35286
relief white show unique effect of relief metallic. In this case two time firing, firing relief first then apply
additional metallic colors, shows better results.
Mixing flux： 35101 low firing temperature flux or 35104 high firing temperature flux is recommended to mix
with 35M51 gray and 35M52 black to lighten the colors. To choose 35101 flux or 35104 flux depend on firingconditions and type of ware. According to our experience, maximum 30% of additional flux is allowed. 35103
flux is not suitable for mixing.
Overprinting flux： Only 35103 flux is suitable as overprinting flux for35M51 gray and 35M52 black.
Overprinting flux improves color gloss, increase metallic effect but this flux does not improve chemicaldurability, such as acid, alkali and dishwasher resistance. This flux can be overprinted on all of theSELECTION 35M metallic colors and SELECTION 35 colors. 35101 flux and 35104 flux are not suitable foroverprinting on 35M metallic colors
We recommend testing the stability of mixing colors, overprinted flux and colors under the end-user’s firingconditions before mass production.

7. Chemical durability
Chemical durability of 35M51 gray and 35M52 black depends on type of ware, glaze, kiln, color deposit andfiring conditions. The following are the results of tests on porcelain, fired at 830℃, with 10 minutes of soaking
time and 120 minutes of cold-to-cold firing conditions of gas kiln in production.

【7.1 Residual lead and cadmium content】
35M51 gray and 35M52 black contain less than 300 ppm residual lead and less than 100 ppm residual
cadmium and are therefore in compliance with Californian Proposition 65, FDA, EU and Japaneserequirements.

【7.2 Lead and cadmium release】
According to the DI EN 1388-1-2 test, 35M51 gray and 35M52 black show lead and cadmium releases arebelow AAS limits.

【7.3 Acid resistance】
According to the DI EN 1388-1-2 test, 35M51 gray and 35M52 black do not show any visible attack after
immersion in a 4% acetic acid solution for 24 hours at room temperature of 22±2℃.
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Revised: 6/4/2012【7.4 Alkali resistance】
According to ASTM C556-88 test, 35M51 gray does not show any visible attack up to 4 hours but 35M52

black shows slightly visible attack.
8. Material Safety Data Sheet (MSDS)
Material safety data sheet (MSDS) of 35M51 gray and 35M52 black are available on request.
The above information and statements are unsolicited. IZAWA PIGMENT CO., LTD. provides them topromote its products. The above information and statements are also believed to be accurate at the time ofpublication under their laboratory conditions. Use of them is at the sole discretion of the user and IZAWAPIGMENT CO., LTD. does not give any warranty with respect to any test results. In no event shall IZAWAPIGMENT CO., LTD. be liable for any direct, indirect, special, incidental, or consequential damages arising outof the use of the above information.

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