Exceval™ is the trademark of Kuraray's novel water soluble polymer, specially designed for ’Äúhigh water resistance’Äù. It is commonly known that fully hydrolyzed polyvinyl alcohol shows higher water resistance based on the higher crystallinity than that of partially hydrolyzed polyvinyl alcohol, but ’Äúviscosity stability’Äù is the critical problem. Exceval™ achieves the compatibility of both performances, ’Äúhigh water resistance’Äù and ’Äúviscosity stability’Äù based on Kuraray's accumulated technology.

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	Grade	Viscosity1 DIN 53015 [mPa x s]	Degree of hydrolysis (saponification) [mol.-%]	Max Ash content2 [%]	Max Volatile content3 [%]
Super hydrolyzed grades	HR-3010	12.0-16.0	99.0-99.4	0.4	5.0
Fully hydrolyzed grades	RS-2117	23.0-30.0	97.5-99.0	0.4	5.0
	AQ-4104	3.5- 4.5	98.0-99.0	0.4	5.0
Medium hydrolyzed grades	RS-1717	23.0-30.0	92.0-94.0	0.4	5.0

¹ of a 4% aqueous solution at 20¬† C determined by Brookfield synchronized rotary-type viscometer.
² calculated as Na2O.
³ after 3 hours' drying time at 105¬† C. Methanol content less than 3%.

• Wood adhesives
• Packaging adhesives
• Top coat for thermal-sensitive paper
• Release paper
• Gas barrier coating