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D6107-97 – Standard Test Method Technical Guide
ASTM D6107-97 (Reapproved 2023) is the definitive standard specification for stop-leak additives intended for use in automobile and light-duty engine coolant systems. The primary objective of this standard is to ensure that stop-leak additives can effectively seal minor leaks within the cooling system without adversely affecting critical functions such as heat transfer and fluid flow.
📋 Scope and Referenced Documents
This specification covers the functional requirements for stop-leak additives in light-duty service. All testing and values adhere strictly to SI units as the standard, with imperial units provided for informational purposes only. The standard does not address all safety concerns; users are responsible for establishing appropriate safety and environmental practices.
Compliance with D6107-97 requires adherence to several key ASTM standards:
- D3147: The primary test method for evaluating the plugging performance of stop-leak additives.
- D1881: Test Method for Foaming Tendencies of Engine Coolants in Glassware.
- D1176: Practice for Sampling and Preparing Aqueous Solutions of Engine Coolants or Antirusts for Testing Purposes.
⚡ Critical Note on Units: The values stated in SI units are regarded as the standard in D6107-97. All test reports and compliance documentation must strictly reference SI unit requirements.
🔬 Performance Requirements and Key Metrics
The performance of a stop-leak additive under this specification is defined by specific quantitative limits designed to balance plugging capability with system safety.
🟦 Plugging Capability
The additive must successfully plug a minimum hole size of 0.254 mm (0.010 in.) and a minimum slot size of 12.7 mm (0.50 in.) long by 0.254 mm (0.010 in.) wide. To prevent unwanted blockage of critical cooling passages, the additive must NOT plug a slot larger than 12.7 mm (0.50 in.) long by 0.635 mm (0.025 in.) wide.
| 🎯 Performance Criterion | 📐 Requirement (SI) | 📏 Requirement (Imperial) |
|---|---|---|
| Minimum Hole Plugging Size | 0.254 mm | 0.010 in. |
| Minimum Slot Plugging Size | 12.7 mm x 0.254 mm | 0.50 in. x 0.010 in. |
| Maximum Slot (No Plug) | 12.7 mm x 0.635 mm | 0.50 in. x 0.025 in. |
🧪 Purity and Foaming Control
Fluid removed from the D3147 stop-leak test apparatus must not leave any residue or particulate matter on an ASTM E-11 No. 10 sieve. Following the plugging test, the fluid must be tested for foaming tendency per D1881, allowing a maximum foam volume of 150 mL with a complete break time of 5 seconds maximum.
| ⚡ Secondary Requirement | 📏 Specification Limit |
|---|---|
| Sieve Residue (No. 10) | None permitted |
| Foam Volume (D1881) | 150 mL maximum |
| Foam Break Time (D1881) | 5 seconds maximum |
💡 Testing Integrity: D6107-97 mandates duplicate test runs for every additive evaluation. Both sets of results must satisfy all outlined requirements to pass the specification. This double-verification ensures process reliability.
⚙️ Testing Protocol and General Requirements
The testing sequence is strictly defined. Sampling and preparation of coolant dilutions must follow Practice D1176. The evaluation begins with the D3147 stop-leak test, followed by an immediate foaming tendency test using D1881 on the fluid removed from the D3147 apparatus.
When installed in a vehicle cooling system according to the manufacturer’s instructions and product label, the additive must not adversely affect heat transfer or fluid flow.
⚠️ Safety Responsibility: ASTM D6107-97 does not purport to address all safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices.
❓ Frequently Asked Questions
🔍 What is the primary purpose of ASTM D6107-97?
The standard specifies the performance requirements for a stop-leak additive used in light-duty engine coolant systems. Its goal is to ensure the additive can seal small leaks without adversely affecting heat transfer or fluid flow.
💡 What are the exact dimensions for the plugging tests?
The additive must plug a minimum hole of 0.254 mm and a min slot of 12.7 mm x 0.254 mm. It must also demonstrate it will not plug a larger channel measuring 12.7 mm x 0.635 mm.
⚡ How is the foaming tendency of the additive evaluated?
Foaming is evaluated per Test Method D1881. The fluid from the D3147 plugging test is used. The specification allows a maximum foam volume of 150 mL and a maximum break time of 5 seconds.
📌 Are multiple tests required for specification compliance?
Yes, the standard explicitly requires duplicate test runs. Both sets of results must meet all the performance requirements outlined in the specification to ensure consistent and reliable additive performance.