ERL 4221 has replaced ERL 4206. ERL 4221 has a higher viscosity than the previously used ERL 4206. Spurr AR, 1969. A low-viscosity epoxy resin embedding medium for electron microscopy. J Ultrastruc Res, 26, p. 31. Ellis, E Ann, Solutions to the Problem of Substitution of ERL 4221 for Vinyl Cyclohexene Dioxide in Spurr Low Viscosity Embedding Formulations, Microscopy Today, V 14, No 4, July 2006 The Spurr Kit gives excellent penetration for tough materials particularly in the studies of botanical, mineral and other hard biological specimens. When the mixture is kept at room temperature for 24 hours its viscosity will increase to 140cP, as is the case with other resins. When fully formulated, the Spurr’s resin will store in a deep-freeze for two months and at room temperature for two days. Curing is done at 70ºC for about 8 hours (see our Microwave system for significant time saving during epoxy processing). PELCO® Technical Notes for Low Viscosity Kit (1.54MB PDF) Low Viscosity "Spurr" Kit includes: Cg ERL 4221 (replaces ERL 4206), 225ml (18306-4221) SDS (95KB PDF) I DER® 736, 250g (18310) SDS (104KB PDF) I NSA, 450g (18301) SDS (100KB PDF) C DMAE, 25g (18315) SDS (138KB PDF) Note: This product is hazardous. An extra shipping charge is required by the Carriers when hazardous goods are transported. Hazard Warning Guides Used in Product Listings Cg = Suspected Carcinogen C = Corrosive E = Environment F = Flammable H = Health I = Irritant L = Lachrymator O = Oxidizing R = Radioactive S = Sensitizer T = Toxic U = Unlisted as hazard; unknown hazard if any An extra shipping charge is required by the Carriers when hazardous goods are transported.
