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Polyurethane

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Result No.: 20260624150244638317491 Owner: uday Comments: 0
FTIR Analysis Report High confidence

Polyurethane

Sample & Measurement Parameters

Report No. 20260624150244638317491
Date 2026-06-24 10:06:55
Spectral Range (cm⁻¹) [(400, 4000)]
Baseline Disabled
Confidence 85%

Identification Result

85%

The main component may be a polyurethane. The spectrum displays a strong carbonyl stretch at 1726 cm⁻¹ typical of urethane/ester groups, along with characteristic amide II bands at 1533 and 1510 cm⁻¹ from N–H bending and C–N stretching, indicating urethane linkages. Absorptions at 1151 and 1043 cm⁻¹ are consistent with C–O–C ether stretches, and aliphatic C–H vibrations appear near 2924 cm⁻¹. This combination of urethane carbonyl, amide II, and ether features is highly suggestive of a polyurethane material. The supplied background ‘Rubber with recoater’ is partly consistent with these spectral findings: the term ‘recoater’ aligns with a polyurethane coating, while ‘rubber’ likely refers to the substrate and is not reflected in the spectrum. If precise identification of the polyurethane type is required, complementary analysis such as pyrolysis GC-MS could resolve the soft segment composition

Library Comparison

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Library Search Results — Top 15 Candidates

Rank Match % Compound Formula / SMILES Library Preview Action
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Peak Analysis

★ = Literature-supported assignment
# Wavenumber (cm⁻¹) Absorbance Assignment Citation Confidence
1 1726 1.00 The band at 1726 cm-1 is assigned to free C=O urethane. [10] High confidence
2 1151 0.95 The band at 1151 cm-1 is assigned to C-O in C-O-C. [4] High confidence
3 1206 0.59 The band at 1206 cm-1 is assigned to νascoc + ch3. [5] Moderate confidence
4 1043 0.46 The band at 1043 cm-1 is assigned to C-O single-bond vibration. [3] Moderate confidence
5 1312 0.26 The band at 1312 cm-1 is assigned to amide. [6] Moderate confidence
6 · 969 0.25 - - -
7 859 0.25 The band at 859 cm-1 is assigned to C-O single-bond vibration. [2] Moderate confidence
8 · 1412 0.24 - - -
9 1533 0.24 The band at 1533 cm-1 is assigned to amide. [9] High confidence
10 · 992 0.24 - - -
11 · 1347 0.22 - - -
12 1380 0.21 The band at 1380 cm-1 is assigned to alkyl C-H vibration. [7] High confidence
13 822 0.21 The band at 822 cm-1 is assigned to out of plane bending of benzene ring. [1] Moderate confidence
14 1510 0.18 The band at 1510 cm-1 is assigned to urethane. [8] High confidence
15 · 768 0.16 - - -
16 · 642 0.12 - - -
17 · 565 0.12 - - -
18 · 1598 0.12 - - -
19 2924 0.07 The band at 2924 cm-1 is assigned to alkyl C-H vibration. [11] High confidence

References

Appendix — Raw Spectrum

Raw sample spectrum
Generated by FTIR.fun — Report #20260624150244638317491 2026-06-24 10:06:55
Discussion

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