Provides excellent penetration for embedding biological tissues and rapid infiltration. Easy to prepare. The hardness is adjusted by changing the proportion of the flexibilizer (DER 736). The blocks have good trimming and sectioning qualities. Thin sections are tough under the electron beam.
Spurr, A.R., (1969) J. Ultrastruct. Res. 26, 31-42
450 ml NSA
225 mL ERL 4221
225 mL DER 736