Technical indexes :

Type	JF-45	JF-43
Appearance	Yellow amber solid
Epoxide value (eq/100g)	0.40-0.50	0.40-0.48
Unhydrolytic chlorine (eq/100g)	≤0.008	≤0.005
Hydrolytic chlorine(eq/100g)	≤0.02	≤0.02
Volatile %	1	1
Softening point °C	55-65	65-75

Cresol-formaldehyde epoxy resins made from a mixture containing meta- and paracresol or ortho-, meta- and paracresol in a ratio selected from a given range for use in fast positive photoresist compositions together with one or more sensitizing compounds. When dissolved in a mixture of organic solvents, the photoresist compositions are suitable for application as a thin coating to a substrate.