The quality requirements of leather for automobile decoration are divided into sensory requirements and physical and chemical properties. Due to the particularity of the automobile use environment, in addition to the general physical properties, it also increases the light resistance, wear resistance, flame retardancy, atomization value, smell and so on. And put forward requirements for toxic and harmful substances-banned azo dyes and free formaldehyde.

(1) sensory requirements

1) The thickness of the whole leather is basically uniform, and there is no greasy feeling and peculiar smell. 2) The leather body is smooth, soft, plump and elastic.

3) The front leather does not crack or wrinkle, and the main parts are not loose. Leather coating should be uniform, the coating should be firmly attached, and there is no pulp shedding and cracking. Suede leather has uniform fluff and basically the same color.

(2) Physical and chemical properties

There are seventeen physical and chemical performance indexes:

1) Apparent density: 0.6g/cm3 ~ 0.8g/cm3.

2) Tension resistance: it can be divided into four types according to thickness. Type I ≥ 100N, type II ≥ 120N, type III ≥ 130N, and type IV ≥ 140N.

3) Elongation at break: 35% ~ 70%. 4) Tearing force: divided into four types according to thickness. Type ⅰ ≥ 16N, type ⅱ ≥20N, type ⅲ ≥20N, and type ⅳ ≥25 N.

5) Color fastness to rubbing: dry rubbing ≥4/5, wet rubbing ≥4, and color fastness to rubbing in alkaline sweat, gasoline and neutral soap solution ≥4.

6) Folding fastness: 100000 times without cracks. 7) Light resistance ≥ Grade 4. 8) Heat resistance ≥4.

9) Wear resistance: no obvious damage or peeling. 10) coating adhesion fastness ≥ 3.5n/10mm.11) flame retardancy ≤ 100mm/min. 12) Atomization value ≤5mg. 13) odor ≤3. 14)pH ≥3.5。

15)pH dilution difference ≤0.7.

16) banned azo dyes ≤30mg/kg. 17) Free formaldehyde ≤20mg/kg.