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D6183-00 – Standard Test Method Technical Guide
🧪 Test Summary, Significance, and Scope
ASTM D6183-00 (Reapproved 2021), officially titled “Standard Test Method for Tackiness of Finish on Leather,” provides a standardized laboratory procedure to evaluate the tendency of finished leather to adhere to an adjacent cloth surface. This test method is under the jurisdiction of ASTM Committee D31 on Leather and is critical for quality control, ensuring that finished surfaces do not exhibit excessive “tacky” characteristics.
The scope of this standard explicitly covers any type of finished leather. It is important to note that this test method explicitly does not apply to wet blue. Definitions of terms used in this test method can be found in Terminology D1517, with tackiness specifically defined as the tendency of cloth to adhere to leather.
⚙️ Apparatus and Standard Test Procedure
The procedure requires precise control of temperature, pressure, and duration. The apparatus must include a circulating oven, bleached cheesecloth, and a loading device. During the test, the finished leather specimen is brought into contact with the test cloth under a prescribed pressure. The apparatus is heated, cooled to room temperature, and then the cloth is peeled from the surface. The following table summarizes the critical test parameters:
| 🔧 Instrument / Parameter | 📏 Specification / Value |
|---|---|
| Oven Type | Circulating Oven |
| Oven Temperature | 50 ± 2 °C (122 ± 3.6 °F) |
| Test Cloth Material | Bleached Cheesecloth |
| Test Cloth Dimensions | 10 x 10 cm (3.94 x 3.94 in.) |
| Applied Contact Pressure | 100 g/cm² (1.42 lb/in²) |
| Dwell Time in Oven | 5 Minutes |
The finished leather, cheesecloth, and pressure device must be preheated separately in the oven to 50 ± 2 °C. The cheesecloth is then applied to the leather surface, and the pressure of 100 g/cm² is applied evenly for exactly 5 minutes while the assembly remains in the oven. After heating, the pressure is removed, and the assembly is taken out of the oven to cool to room temperature before the cloth is peeled for observation.
⚠️ Critical Note on Temperature Control: The oven must be a circulating type to ensure uniform temperature throughout the chamber. Failure to maintain the strict 50 ± 2 °C (122 ± 3.6 °F) tolerance can significantly alter the tackiness behavior of the finish and invalidate the test results.
📐 Specimen Preparation and Conditioning
Standardized sampling and conditioning are prerequisites for reproducible results. Leather samples must be taken according to Practice D2813 (Sampling Leather for Physical and Chemical Tests). Test pieces must be conditioned in accordance with Practice D1610 (Conditioning Leather and Leather Products for Testing). The standard explicitly requires that any conditioning used other than the prescribed method in D1610 must be thoroughly documented in the test results.
The leather sample itself must be cut larger than the dimensions of the cheesecloth to ensure proper handling of the finished surface without edge effects interfering with the pressure distribution.
💡 Best Practice Tip: Because tackiness is highly sensitive to humidity and prior temperature exposure, ensure the cheesecloth is conditioned alongside the leather samples according to D1610 (typically 23 ± 2 °C and 50 ± 5 % relative humidity) before testing begins.
❓ Frequently Asked Questions
🔍 What is the definition of “tackiness” in this standard?
Tackiness is specifically defined in Terminology D1517 as the tendency of cloth to adhere to the finished leather surface.
💡 Can this test be performed on any type of leather?
This test method is intended for use on any type of finished leather. It explicitly states that it does not apply to wet blue.
⚡ What are the exact pressure and time requirements during heating?
The device must apply a uniform pressure of 100 g/cm² (1.42 lb/in²) over the entire surface of the cheesecloth. This pressure must be maintained for a duration of 5 minutes while the test assembly is inside the oven.
📌 What standards are referenced for sampling and conditioning?
Sampling must be performed according to Practice D2813, and conditioning of the test specimens must follow Practice D1610.