Tiêu chuẩn quốc tế
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Số hiệu
Standard Number
ASTM D4671-05
Năm ban hành 2005
Publication date
Tình trạng
W - Hết hiệu lực
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Tên tiếng Anh
Title in English Standard Test Method for Polyurethane Raw Materials Determination of Unsaturation of Polyols
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Chỉ số phân loại Quốc tế (ICS)
By field |
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Số trang
Page 4
Giá:
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Phạm vi áp dụng
Scope of standard 1.1 These test methods measure unsaturation in polyether polyols. (See Note 0.)1.1.1 Test Method A, High-Volume Reagent MethodUses about 50 mL of 0.1 M mercuric acetate reagent in methanol and 15 g or more of sample. These test methods use an indicator for colorimetric determination of an end point. It is recommended for polyols with low values (below 0.01 millequivalents per gram (meq/g)) of unsaturation where large sample sizes are required.1.1.2 Test Method B, Low-Volume Reagent MethodUses 2 mL of ca. 0.05 M mercuric acetate reagent in methanol and about 1 g of sample or less. These test methods use a potentiometric determination of an end point.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. Note 0There is no equivalent ISO standard.
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