ASTM D3306 – Standard Test Method for Thermal Diffusivity by the Flash Method
Description:
Scope
1.1 This specification covers the requirements for ethylene glycol or propylene glycol or ethylene glycol containing glycerin base engine coolants used in automobiles or other light-duty service cooling systems. When concentrates are used at 40 % to 60 % concentration (allowance to 70 % concentration agreement between manufacturer and user) by volume in water, or when prediluted glycol base engine coolants 50 volume % or higher engine coolant concentrate are used without further dilution, they will function effectively to provide protection against freezing, boiling, and corrosion.
1.2 The coolants governed by this specification are categorized as follows:
| Coolant Type | Description |
| I | Ethylene glycol base concentrate |
| II | Propylene glycol base concentrate |
| V | Ethylene glycol base concentrate containing glycerin |
| III | Ethylene glycol predilute 50 volume % or higher engine coolant concentrate |
| IV | Propylene glycol predilute 50 volume % or higher engine coolant concentrate |
| VI | Ethylene glycol base predilute containing glycerin 50 volume % or higher engine coolant concentrate |
Note 1: This specification is based on the knowledge of the performance of engine coolants prepared from new or virgin ingredients. This specification shall also apply to engine coolants prepared using glycol generated from recycled or reprocessed used coolant or reprocessed industrial-source glycol, provided that said glycol meets the requirements of Specification E1177. Separate specifications (D6471 and D6472) exist for engine coolants prepared from recycled or reprocessed used coolant or reprocessed industrial-source glycol that does not meet the requirements established in Specification E1177. This specification shall also apply to glycol based engine coolants prepared using fully refined glycerin provided that said glycerin meets the requirements for Specification D7640.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
ASTM D3302