Sicomin

Technical Information 

EVP 008505 e, November 2005 

supersedes TI/P 3128 d,e, January 1996 

® 

= registered trademark of 

BASF Aktiengesellschaft, 

unless otherwise indicated 

Page 1 of 10 

Sicomin ® 

pigments for coatings 

lead chromate pigments 


is BASF’s trademark for lead chromate and lead molybdate 

pigments respectively. 

The letter L preceding the numerical color code indicates that the 

pigments undergo an exit inspection specific to the coatings industry. 

An S following the numerical code indicates improved resistance 

to SO 2 . 

The individual pigments differ from each other in shade, chroma, 

hiding power and color strength, dispersion behavior, fastness to 

light and weathering as well as resistance to SO 2 and other acidic 

industrial emissions. Also a criterion is a particularly low fraction of 

lead that is soluble in hydrochloric acid. 

Different from other pigment ranges from BASF (e. g., Heliogen ® , 

Paliogen ® 

etc.), the last two digits of the numerical color code indicate 

the property profile: 

XX22 

e. g., Sicomin ® 

Yellow L 1622 

XX22 Type U 

e. g., Sicomin ® Yellow L 1622 

Type U 

XX25 


Red L 3025 

XX25 Type U 


Red L 3025 

Type U 

XX30 


Red L 3030 S 

XX35 


Red L 3035 S 

standard grades, particularly high 

chroma 

standard grades, properties like those 

of XX22, lead fraction soluble in hydrochloric 

acid < 5 % 

improved resistance to weathering 

properties like those of XX25, lead 

fraction soluble in hydrochloric acid < 

5 % 

resistant to weathering and SO2 like XX30 S, reduced lead fraction 

soluble in hydrochloric acid 

The first two digits (denoted “XX” in the table above) indicate, just 

as with any other chromatic pigment from BASF, the shade: 

15 → 21 chrome yellow, greenish → reddish 

29 → 33 molybdate red, yellowish → bluish

EVP 008505 e, November 2005 Page 2 of 10 Sicomin ® 


Range 

table 1 nature 
























Colour Index 

part 1 part 2 

Yellow L 1522 lead chromate Pigment Yellow 34 77 603 


Yellow L 1622 Type U lead chromate Pigment Yellow 34 77 603 


Yellow L 1630 S lead chromate Pigment Yellow 34 77 603 




Yellow L 1922 Type U lead chromate Pigment Yellow 34 77 603 




Red L 2922 lead chromate/lead molybdate Pigment Red 104 77 605 


Red L 3025 Type U lead chromate/lead molybdate Pigment Red 104 77 605 

Red L 3030 S lead chromate/lead molybdate Pigment Red 104 77 605 



Red L 3125 Type U lead chromate/lead molybdate Pigment Red 104 77 605 





Physical form powder 

Shelf life According to our experience, Sicomin ® 

pigments can be stored for 

at least 10 years from the date of delivery when they are kept dry 

and in their original unopened packaging. 

In Germany, lead chromate pigments must be stored in such a way 

that only authorized persons have access to them (§ 24.3 of the 

German Gefahrstoffverordnung (GefStoffV, ordinance on dangerous 

substances). They are not subject to the German Störfallverordnung 

(major hazard prevention ordinance; 12 th 

BimschV of 

May 19, 1988, amended August 31, 1991). 

Properties of the pigment powders 

Data are listed in table 2 and have been determined based on 

these conditions: 

Density determination according to ISO 787-10 

Bulk volume determination following ISO 787-11 

Specific surface determination according to DIN 66132 (Haul and Dümbgen)



pH 1 determination following DIN ISO 787-9 

Oil absorption determination according to ISO 787-5 

Resistance to acids and alkalis A cured film (alkyd/melamine) is exposed for 24 hours to a 2 % hydrochloric 

acid solution or a 2 % caustic soda solution; assessment 

on the gray scale described in ISO 105-A02: 5 = no change of 

shade, 1 = strongest change of shade. 

Fastness to solvents The pigment powder is elutriated in the solvent, the filtrate is assessed 

according to ISO 105-A03. All Sicomin ® pigments are insoluble 

in organic solvents and thus fast to overspraying. 

Fastness to lime and cement Determination according to DIN 55907; the Sicomin ® pigments are 

not suitable to color or coat cement or lime. 

density bulk 

volume 

specificsurface 

g/cm³ l/kg m²/g 

pH 

value 

oil 

absorp 

tion 

g/100 g 

resistance to 

acids alkalis 


Yellow L 1522 5.0 2.4 11 5.0–7.0 22 4 2 


Yellow L 1622 5.2 2.0 10 5.0–7.0 22 4 2 


Yellow L 1622 Type U 5.2 2.0 10 5.0–7.0 22 4 2 


Yellow L 1625 5.5 2.4 8 5.0–7.0 19 4 4 


Yellow L 1630 S 5.3 2.1 7 6.0–8.0 25 4 4 


Yellow L 1635 S 5.3 2.4 8 6.0–8.0 27 4 4 


Yellow L 1835 S 5.5 2.0 16 5.0–7.0 20 4 4 


Yellow L 1922 5.4 2.0 12 5.0–7.0 20 3 3 


Yellow L 1922 Type U 5.4 2.0 12 5.0–7.0 20 3 3 


Yellow L 1925 5.8 1.8 13 6.0–8.0 25 4 4 


Yellow L 1930 S 5.0 1.9 8 6.0–8.0 25 4 4 


Yellow L 2135 S 5.4 1.5 10 6.0–8.0 25 4 4 


Red L 2922 5.6 2.0 11 5.0–7.0 20 2 3 


Red L 3025 6.0 1.8 10 5.0–7.0 20 3 3 


Red L 3025 Type U 6.0 1.8 10 5.0–7.0 20 3 3 


Red L 3030 S 5.8 1.4 11 6.0–8.0 22 4 4–5 


Red L 3035 S 6.0 1.3 12 5.0–7.0 22 4 4–5 

Sicomin ® Red L 3125 5.4 2.0 12 5.0–7.0 25 3 3 

Sicomin ® Red L 3125 Type U 5.4 2.0 12 5.0–7.0 25 3 3 

Sicomin ® Red L 3130 S 5.8 1.3 8 6.0–8.0 22 4 4–5 




1 

part of the quality control testing for Sicomin ® 

pigments for coatings



Properties of the pigments in coatings 

Coloristics The data listed in table 3 were determined on an alkyd/melamine 

baking finish. The terms used are defined below: 

Hue angle h evaluated according to the CIELAB system (DIN 5033), the color 

cycle is divided into 360° (h = angular position in the cycle). 

In the rectangular a*b* coordinate system, H° increases in anticlockwise 

direction from purple (0°/360°) through red, yellow, green 

and blue to violet. 

Chroma C* evaluated according to the CIELAB system: a greater value of C* 

means greater distance from the achromatic point, indicating 

higher chromaticity or purity of shade in samples of standard depth 

of shade 

Lightness L* evaluated according to the CIELAB system (DIN 5033), the larger 

the number, the brighter the shade 

Reduction ratio RR The RR indicates how many parts of white pigment (titanium dioxide) 

must be mixed with one part of chromatic pigment to obtain 

1/3 standard depth of shade (SDS). The higher the RR, the greater 

the color strength of the chromatic pigment. 

Hiding power The values quoted were determined with a Grindopac ®2 

Type 422 

at a PVC common to paint systems, but less than the critical value. 

The reference value for the hiding power is that of stabilized rutile 

titanium dioxide (= 100). 

Dispersibility With the exception of Sicomin ® 

Red L 2922, all Sicomin ® 

pigments 

can be dispersed with a dissolver. With common equipment such 

as sand mills, roller mills or bead mills, Sicomin ® 

Red L 2922 can 

be dispersed relatively easily to produce fine particles and thus 

high-gloss coating compounds. 

Heat stability Temperature above which significant discolorations must be expected 

in baking finishes (test conditions: baking schedule 30 minutes, 

alkyd/melamine system at temperatures below 200 °C 

(392 °F) or silicon resin at temperatures above 200 °C); the heat 

stability depends on the binder and solvent system used. 

2 

registered trademark of Erichsen GmbH & Co. KG



table 3 hue 

angle h 

chroma 

C* 

lightness 

L* 

reduction 

ratio 

RR 

hiding 

power 

heat 

stability 3 

°C 

Sicomin ® Yellow L 1522 83 93 84 1.2 50 200 


Sicomin ® Yellow L 1622 Type U 81 93 83 1.2 50 200 


Sicomin ® Yellow L 1630 S 81 90 81 1.1 60 250 




Sicomin ® Yellow L 1922 Type U 76 92 80 1.4 55 200 




Sicomin ® Red L 2922 39 70 51 1.3 170 200 


Red L 3025 38 66 50 1.2 180 250 


Red L 3025 Type U 38 66 50 1.2 180 250 


Red L 3030 S 38 66 49 1.2 180 250 


Red L 3035 S 38 66 49 1.2 200 250 


Red L 3125 36 64 48 0.7 160 250 


Red L 3125 Type U 36 64 48 0.7 160 250 


Red L 3130 S 36 66 48 0.7 160 300 


Red L 3135 S 36 65 48 0.7 180 250 


Red L 3230 S 34 63 46 0.4 130 200 


Red L 3330 S 33 60 45 0.4 100 200 

3 

Celsius to Fahrenheit conversion: 200 °C = 392 °F, 250 °C = 482 °F, 300 °C = 572 °F



Fastness to weathering, 

southern Germany 

air-drying alkyd resin 

The ratings given refer to test panels (inclined 45° facing south) 

exposed for periods of 12 and 24 months in southern Germany. 

The pigments were tested in an air-drying alkyd resin system and 

an alkyd/melamine baking finish (30 minutes at 130 °C [266 °F]). 

The assessment is based on the ISO 105-A02 gray scale. 

12 months 24 months 

full 1:1 1:10 full 1:1 1:10 


Yellow L 1625 4d 4 4 3d 3 3 


Yellow L 1630 S 4d 4 4 3–4d 3–4 3–4 


Yellow L 1635 S 4d 4 4 3–4d 3–4 3–4 


Yellow L 1835 S 4d 4 4 3–4d 3–4 3–4 


Yellow L 1925 3–4d 3–4 3–4 2d 2 2 


Yellow L 1930 S 4d 4 4 3–4d 3–4 3–4 


Yellow L 2135 S 4d 4 4 3–4d 3–4 3–4 


Red L 2922 2 2 2 2 2 2 

Sicomin ® Red L 3025 4 4 4 3 3 3 

Sicomin ® Red L 3025 Type U 4 4 4 3 3 3 

Sicomin ® Red L 3030 S 4 4 4 3 3 3 

Sicomin ® Red L 3035 S 4 3–4 3–4 3–4 3 3 

Sicomin ® Red L 3125 4 4 4 3 3 3 

Sicomin ® Red L 3125 Type U 4 4 4 3 3 3 


Sicomin ® Red L 3135 S 4 3–4 3–4 3–4 3 3 



alkyd/melamine system 

12 months 24 months 

full 1:1 1:10 full 1:1 1:10 

Sicomin ® Gelb L 1522 3–4d 3–4 3–4 3d 3d 3h 

Sicomin ® Yellow L 1622 3–4d 3–4 3–4 3d 3d 3h 

Sicomin ® Yellow L 1622 Type U 3–4d 3–4 3–4 3d 3d 3h 

Sicomin ® Yellow L 1625 5d 4–5 4–5 4–5d 4–5 4–5 

Sicomin ® Yellow L 1630 S 4–5d 4–5 4–5 4–5d 4–5 4–5 



Sicomin ® Yellow L 1922 3–4d 3–4 3–4 3d 3d 3h 


Yellow L 1922 Type U 3–4d 3–4 3–4 3d 3d 3h 


Yellow L 1925 4–5d 4–5 4–5 4d 4 4 


Yellow L 1930 S 4–5d 4–5 4–5 4–5d 4–5 4–5 


Yellow L 2135 S 4–5d 4–5 4–5 4–5d 4–5 4–5 


Red L 2922 3–4 3–4 3–4 3–4 3–4 3–4 


Red L 3025 4–5 4–5 4–5 3–4 3–4 3–4 


Red L 3025 Type U 4–5 4–5 4–5 3–4 3–4 3–4 


Red L 3030 S 4–5 4–5 4–5 3–4 3–4 3–4 


Red L 3035 S 4–5 4–5 4–5 3–4 3–4 3–4 


Red L 3125 4–5 4–5 4–5 3–4 3–4 3–4 


Red L 3125 Type U 4–5 4–5 4–5 3–4 3–4 3–4 

Sicomin ® Red L 3130 S 4–5 4–5 4–5 3–4 3–4 3–4 



Sicomin ® Red L 3330 S 4–5 4–5 4–5 3–4 3–4 3–4



Fastness to weathering 

Florida, USA 

The ratings given refer to test panels (inclined 5° facing south) 

exposed for over 18 months in Florida, USA. The pigments were 

tested in two baking systems: alkyd/melamine (30 minutes at 

130 °C) and acrylic-melamine (30 minutes at 140 °C [284 °F]). 

Again, the assessment is based on the ISO 105-A02 gray scale. 

18 months 

alkyd/melamine system acrylic/melamine system 

full 1:5 full 1:5 


Yellow L 1630 S 3–4 3–4 4 4 


Yellow L 1635 S 3–4 3–4 3–4 3–4 


Yellow L 1835 S 3–4 3–4 3–4 3–4 


Yellow L 1930 S 3–4 3–4 3–4 3–4 


Yellow L 2135 S 3–4 3–4 3–4 3–4 


Red L 3030 S 4 3–4 


Red L 3035 S 4 3–4 

Sicomin ® Red L 3130 S 4 3–4 



Sicomin ® Red L 3330 S 4 3–4



Resistance to SO 2 

Fastness to light 

Here a pigment is said to be resistant if the discoloration is no 

greater than 3– 4 on the ISO 105-A02 gray scale after 10 exposure 

cycles (2 liters of SO 2 per cycle). The pigments were tested in an 

alkyd/melamine system (130 °C at 30 minutes). The test method is 

described in DIN 50018. 

Exposure to light, testing and assessment were carried out following 

DIN 53952, using the eight-step wool scale (1 = very poor, 8 = 

outstanding). 

resistance to fastness to light 

SO2 full 1:1 1:10 

Sicomin ® Yellow L 1522 6–7 7 7 

Sicomin ® Yellow L 1622 6–7 7 7 

Sicomin ® Yellow L 1622 Type U 6–7 7 7 

Sicomin ® Yellow L 1625 8 8 8 


Yellow L 1630 S yes 8 8 8 






Yellow L 1922 6–7 7 7 


Yellow L 1922 Type U 6–7 7 7 


Yellow L 1925 8 8 8 






Red L 2922 5 6 7 


Red L 3025 7 8 8 


Red L 3025 Type U 7 8 8 


Red L 3030 S yes 7 8 8 


Red L 3035 S yes 7 8 8 


Red L 3125 7 8 8 


Red L 3125 Type U 7 8 8 


Red L 3130 S yes 7 8 8 


Red L 3135 S yes 7 8 8 


Red L 3230 S yes 7 8 8 


Red L 3330 S yes 7 8 8 

Notes on individual pigments 

XX22 series These pigments are used when the emphasis is on economy rather 

than fastness to light and weathering and resistance to SO 2 . They 

are particularly suitable as the sole colorant present, either in the 

full or reduced shades, and in combination with other pigments for 

producing oranges and greens. 

XX25 series These pigments, whose shade is somewhat duller, their fastness to 

light and weathering good enough for high-quality automotive 

paints. 

XX30 S series Apart from having very good light and weathering fastness, these 

pigments exhibit high resistance to SO 2 and other acidic gases 

emitted by industry.



XX35 S The coloristic and fastness properties of the XX35 S series correspond 

to those of the XX30 S series. However, an additional characteristic 

of the XX35 S series is very low solubility in dilute 

hydrochloric acid. Their properties are therefore of particular interest 

when the coating material has to comply with specific public 

health and industrial hygiene regulations. 

Type U Type U grades contain less than 5 % lead that is soluble in hydrochloric 

acid. Apart from that, Type U grades have roughly the same 

coloristic and performance properties as the standard grades. They 

therefore represent an economical alternative to the XX35 S series 

pigments (which are also low in soluble lead) in cases where it is 

unnecessary to have XX35 S series fastness properties. 

Dispersion 

Application 

Their economy, heat stability, resistance to solvents, chromatic 

shades with good hiding power and gloss and – particularly with 

the XX25, XX30 S and XX35 S series – excellent fastness to weathering 

in full shades and white reduction are the typical property 

profile of Sicomin ® 

pigments. They have been used for decades in 

all sorts of air-drying and baking finishes in applications where their 

lead content can be tolerated. 

Performance in water-based paints is very good, particularly with 

the XX22 series pigments. For casein systems, the XX25, XX30 S 

and XX35 S series pigments are recommended. Paint formulators 

should carry out their own tests to determine which Sicomin ® 

grades are suitable for emulsion, electro deposition, epoxy and 

acid-catalyzed coatings; here, the multiplicity of systems involved 

does not permit a blanket recommendation. 


pigments can be dispersed with the usual dispersion 

equipment found in the coatings industry. Given optimal mill-base 

composition, dispersing by high-speed impeller mill is particularly 

economical. 


Yellow L 1630 S 

27.0 parts short-oil alkyd resin 60 % in xylene 

65.0 parts pigment 

92.0 parts approx. 20 minutes on impeller mill 

(mill base temperature approx. 70 °C 

[158 °F], 10-30 minutes depending on 

batch size), then 

8.0 parts add xylene/butanol 4:1, 

100.0 parts one quick passage on pearl mill 

Slight adjustments to the composition of the mill base are necessary, 

depending on the pigment grade, its wettability or the viscosity 

of the binder. The peripheral speed of the disperser’s disc 

should be higher than 19 m/s.



The mill base should be filtered to remove any residual agglomerates; 

these can be recognized as nibs in the determination of particle 

size. Filtration does not cause any measurable decrease in the 

hiding power and tinting strength or a change in gloss. 

Limitation of use Many countries regulate the manufacture, use and labeling of pigments 

containing lead or of coatings based on them. These regulations 

must be adhered to. More information is available from the 

Data sheet on product safety of the individual Sicomin ® pigment. 

Safety 

When handling these products, advice and information given in the 

safety data sheet must be complied with. Further, protective and 

workplace hygiene measures adequate for handling chemicals 

must be observed. 

Note 

The data contained in this publication are based on our current 

knowledge and experience. In view of the many factors that may 

affect processing and application of our product, these data do not 

relieve processors from carrying out their own investigations and 

tests; neither do these data imply any guarantee of certain properties, 

nor the suitability of the product for a specific purpose. Any 

descriptions, drawings, photographs, data, proportions, weights, 

etc. given herein may change without prior information and do not 

constitute the agreed contractual quality of the product. It is the 

responsibility of the recipient of our products to ensure that any 

proprietary rights and existing laws and legislation are observed. 

BASF Aktiengesellschaft 

Performance Chemicals for 

Coatings, Plastics and Specialties 

67056 Ludwigshafen, Germany 

www.basf.com/pigments 

www.basf.com/resins 

www.basf.com/lightstabilizers

Sicomin

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