Product Specifications

Viscosity:	Flash Point:	Density (lb/gal):	Solid (% by weight):	Solid (% by volume):	Shelf Life (months):
Zahn #2 signature cup 30 sec at 77°F	-4° F (-20°C)	7.96	33.5%	21%	12

Product Description

Chembase 550 Black is a single component nitrocellulose basecoat/primer that provides good build and hide. Chembase 550 Black is a quality coating designed for the professional applicator who requires an easy to handle product. Chembase 550 Black is supplied at a ready to spray viscosity.  This coating will dry quickly and sand easily. Chembase 550 Black may be used for many interior wood applications.

Recommended:  Architectural Woodwork Institute Nitrocellulose Lacquer System (8^th Ed).

 

Uses

Chembase 550 Black is a recommended primer for Chemcraft Chemlack 550 Black nitrocellulose lacquer. This system is designed for millwork, household furniture, decorative items as well as many other interior wood applications.

Environmental Data (as supplied)

VOC less exempt lb/gal:	VOC lb/gal:	VOC less exempt g/l:	VOC g/l:	VOC lb/lb Solid:	VHAPs lb/lb Solid:
<4.60	<2.30	<550	<275	<0.90	<0.20

Note:

N/A

Application Data

Suggested Uses:	Mixing Ratio:	Pot Life:	Application Viscosity:	Reducer:	Retarder:	Clean-up Solvent:	Recommended Wet Film:	Coverage:
Wood Primer	N/A	N/A	Zahn #2 signature cup 22 – 30 seconds	800-5500	800-5742	800-5500	3 – 5 mils	Coverage is 336 sq. ft/gal at 1 mil dry and at 100% transfer efficiency. Coverage will vary depending on method of application or coating thickness.

Note:

N/A

Surface Preparation

Substrate must be sanded using 120, 150 or 180 grit stearated paper prior to coating. Chembase 550 Black should be sanded prior to being topcoated with 280/320 grit stearated paper. Appropriate topcoats are Chemlack 550 Black 230-27XX. Chembase 550 Black cannot be used on metal or old oil finishes.

General Information

Agitate material before use. Chembase 550 Black must be agitated thoroughly at all times to ensure product consistency and consistent gloss. 

Apply at 3-5 mils wet on sanded substrate. A further coat may be applied after complete drying followed by sanding with 280/320 grit stearated paper. 

Maximum film build of Chembase 550 Black should not exceed 3 mils dry.  Maximum film build of total coating system must not exceed 4 mils dry.

Chembase 550 Black should not be used and dried at temperatures below 64°F or relative humidity above 65%.

THE CUSTOMER IS RESPONSIBLE FOR FOLLOWING THE RECOMMENDED APPLICATION PROCEDURES. FAILURE TO ADHERE TO THE RECOMMENDATIONS GIVEN IN THIS DATA SHEET WILL LIKELY RESULT IN UNSATISFACTORY FILM APPEARANCE OR FILM FAILURE. THE COMPLETE COATING SYSTEM SHOULD BE CHECKED FOR REQUIRED PROPERTIES PRIOR TO THE START-UP OF PRODUCTION.

Drying Times

Room Temperature (68°F)

Tack Free Time:	Dry to Sand:	Dry to Stack:
15 minutes	30 – 45 minutes	2 – 3 hours

Forced Drying Schedule (122°F)

Tack Free Time:	Dry to Sand:	Dry to Stack:
Flash off before entering oven	20 – 30 minutes	60 – 90 minutes

Note:

N/A

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Dry times are greatly affected by film build, porosity of substrate, air movement as well as heat and humidity. Temperatures are based on actual board temperature. This may vary depending on length of time for boards to reach these temperatures. Minimum curing temperatures of 64°F/18°C must be maintained throughout the curing cycle to achieve the film integrity as stated in product features.