ASTM D7715 Standard Specification for Fully-Formulated Glycerin Base Engine Coolant for Heavy-Duty Engines
1. Scope
1.1 This specification covers the requirements for fully-formulated glycerin base coolants for cooling systems of heavy-duty engines. When concentrates are used at 40 to 60 % glycerin concentration by volume in water of suitable quality (see Appendix X1), or when prediluted glycerin base engine coolants (50 volume % min) are used without further dilution, they will function effectively during both winter and summer to provide protection against corrosion, cavitation, freezing, and boiling.

1.2 This specification is intended to cover the requirements for engine coolants prepared from virgin glycerin.

NOTE 1 - This specification is based on the knowledge of the performance of engine coolants prepared from new or virgin ingredients that comply with Specification D7714.

1.3 The coolants governed by this specification are categorized as follows:

1.4 Coolant concentrates meeting this specification do not require addition of supplemental coolant additive (SCA) until the first maintenance interval when a maintenance dose of SCA is required to continue protection in certain heavy duty engine cooling systems, particularly those of the wet cylinder liner-in-block design. The SCA additions are defined by and are the primary responsibility of the engine manufacturer or vehicle manufacturer. If they provide no instructions, follow the SCA supplier's instructions.

1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents
2.1 ASTM Standards:
D1126 Test Method for Hardness in Water
D1293 Test Methods for pH of Water
D3306 Specification for Glycol Base Engine Coolant for Automobile and Light-Duty Service
D3321 Test Method for Use of the Refractometer for Field Test Determination of the Freezing Point of Aqueous Engine Coolants
D4327 Test Method for Anions in Water by Suppressed Ion Chromatography
D4725 Terminology for Engine Coolants and Related Fluids
D5828 Test Method for Compatibility of Supplemental Coolant Additives (SCAs) and Engine Coolant Concentrates
D6130 Test Method for Determination of Silicon and Other Elements in Engine Coolant by Inductively Coupled Plasma-Atomic Emission Spectroscopy
D7583 Test Method for John Deere Coolant Cavitation Test
D7714 Specification for Glycerin Base Engine Coolant for Automobile and Light-Duty Service
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

2.2 Other Standards:
Federal Method 2540B Total Dissolved Solids Dried at 103 - 105°C

3. Terminology
3.1 Definitions:
3.1.1 glycerin base engine coolant, n - engine coolant in which the freeze point depressant is 1,2,3 propane triol, with inhibitors to minimize foaming and corrosion.

3.1.2 supplemental coolant additive (SCA), n - additive used in conventionally inhibited heavy duty engine coolants required to maintain protection against general corrosion, cylinder liner pitting, and scaling in heavy duty engines.

3.1.3 For other definitions and terms used in this specification, refer to Terminology D4725.