The BGD 521-S Solvent Rub Resistance Tester is designed to evaluate the solvent rub resistance of coatings. The BGD 521-S moves a cloth saturated with a suitable solvent, commonly methyl ethyl ketone (MEK), back and forth across a coating under a fixed load to assess its solvent resistance.
The rubbing speed and number of cycles are adjustable, and the instrument automatically counts the completed cycles. One forward stroke and one backward stroke constitute one double rub. Depending on the applicable procedure, the coating is assessed after a specified number of double rubs or when a defined endpoint is reached.
Standards
ASTM D4752 — Standard Practice for Measuring MEK Resistance of Ethyl Silicate (Inorganic) Zinc-Rich Primers by Solvent Rub
ASTM D5402 — Standard Practice for Assessing the Solvent Resistance of Organic Coatings Using Solvent Rubs
NCCA Technical Bulletin 4.2.11 — Evaluation of Solvent Resistance by Solvent Rub
ASTM D4752 covers the MEK resistance of ethyl silicate (inorganic), whereas D5402 covers the solvent resistance of organic coatings. NCCA Technical Bulletin 4.2.11 relates to solvent resistance testing in the coil-coating industry.
Technical Specification
Intelligent microcontroller-based operation with stepless speed adjustment and automatic counting
Touchscreen interface displaying rubbing speed, completed cycles, and preset test cycles
Wide input voltage range: 110–220 V AC, 50/60 Hz
Freely adjustable settings retained for future use
