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D2378-22 – Standard Test Method Technical Guide
ASTM D2378-22 establishes the standard specification for formaldehyde solutions, covering 50 % grade uninhibited and 37 % grade both inhibited and uninhibited. This specification ensures consistent quality and safety for industrial use.
📋 Scope and Referenced Standards
This specification applies to 50 % uninhibited formaldehyde and 37 % uninhibited and inhibited formaldehyde. All specified limits must be rounded to the nearest unit in accordance with Practice E29. Values are in SI units only. For hazard information, refer to the supplier’s Material Safety Data Sheet.
Referenced documents include various ASTM test methods such as D891 for specific gravity, D1209 for color, and D2194 for concentration, as well as Practice E300 for sampling and U.S. Federal Standard PPP-C-2020 for packaging.
🧪 Key Properties and Test Methods
The physical and chemical properties of formaldehyde solutions must conform to the requirements in Table 1. Instrumental Pt-Co color by Test Method D5386 is equivalent to Test Method D1209, though formaldehyde may not have been included in the interlaboratory study.
| 🟦 Property | 📏 37 % Uninhibited | 📐 37 % Inhibited | 🎯 50 % Uninhibited |
|---|---|---|---|
| Formaldehyde Content, wt % | 36.5 – 37.5 | 36.5 – 37.5 | 49.5 – 50.5 |
| Methanol Content, wt % max | 1.0 | 0.5 | 1.0 |
| Acidity (as acetic acid), wt % max | 0.05 | 0.05 | 0.05 |
| Color, Pt-Co scale max | 10 | 10 | 10 |
| Specific Gravity at 25/25°C | 1.075 – 1.085 | 1.075 – 1.085 | 1.120 – 1.130 |
⚠️ Note: Instrumental Pt-Co color by Test Method D5386 has shown no statistically significant difference from visual Pt-Co by Test Method D1209, but formaldehyde solutions may not have been validated in the interlaboratory study. Use both methods with caution.
⚡ Sampling and Safety Precautions
Material must be sampled in accordance with Practice E300 to ensure representative testing. Handling precautions are critical due to the toxic nature of formaldehyde. Avoid acute exposure and sensitization risks.
☣️ Hazard: Formaldehyde and formaldehyde solutions are toxic and exposure should be minimized. Always consult the supplier’s Material Safety Data Sheet for specific hazard information and guidance.
❓ Frequently Asked Questions
🔍 What grades of formaldehyde are covered?
ASTM D2378-22 covers 50 % uninhibited formaldehyde and 37 % uninhibited and inhibited formaldehyde.
💡 How are test results rounded?
All specified limits are rounded to the nearest unit in the last right-hand digit, following Practice E29.
⚠️ What is the methanol content limit for inhibited grades?
For 37 % inhibited formaldehyde, methanol content is typically limited to 0.5 wt % maximum to stabilize the solution.
📌 Why is specific gravity important?
Specific gravity helps verify concentration and consistency; for example, 37 % formaldehyde has a specific gravity of about 1.08 at 25/25°C.