QC/T 966-2014Technical specifications for coatings of automotive plastic parts (English PDF)

1 Scope

This standard specifies the classification, technical requirements and test methods of coatings for automotive plastic parts.

This standard is applicable to the decorative and/or protective coatings for interior plastic parts, exterior plastic parts and underhood plastic parts. The coatings for small plastic parts such as standard fasteners and buckles can refer to this standard.

2 Normative references

The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 1727 Methods of producing films of paints, varnishes, lacquers and related products on test panels

GB/T 1735 Paints and varnishes - Determination of heat resistance (GB/T 1735-2009, ISO 3248: 1998, MOD)

GB/T 1766 Paints and varnishes - Rating schemes of degradation of coats

GB/T 1768 Method of test for abrasion resistance of paint films (GB/T 1768-2006, ISO 7784-2:1997, IDT)

GB/T 1865-2009 Paints and Varnishes - Artificial Weathering and Exposure to Artificial Radiation-Exposure to Filtered Xenon-arc Radiation (ISO 11341: 2004, IDT)

GB/T 6739 Paints and varnishes - Determination of film hardness by pencil test (GB/T 6739-2006, ISO 15184: 1998, IDT)

GB/T 9274-1988 Paints and varnishes; Determination of resistance to liquids

GB/T 9276 Methods of exposure to natural weathering of coating (GB/T 9276-1996, eqv ISO 2810: 1974)

GB/T 9278 Temperatures and humidities for conditioning and testing of paint specimens (GB/T 9278-2008, ISO 3270: 1984, IDT)

GB/T 9286 Paints and varnishes - Cross cut test for films (GB/T 9286-1998, eqv ISO 2409: 1992)

GB/T 9754 Paints and varnishes - Determination of specular gloss of non-metallic paint films at 20° 60°and 85° (GB/T 9754-2007, ISO 2813: 1994, IDT)

GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T 13452.2-2008, ISO 2808: 2007, IDT)

GB/T 13893 Paints and varnishes - Determination of resistance to humidity - Continuous condensation

GB/T 23436 Cleaning fluids for automotive windshield (GB/T 23436-2009, JIS K 2398-1: 2001, NEQ)

ISO 4628-2 Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 2: Assessment of degree of blistering)

ISO 20567-1 Paints and varnishes - Determination of stone-chip resistance of coatings - Part 1: Multi-impact testing)

3 Terms and definitions

For the purposes of this standard, the following terms and definitions apply.

4 Classification of coatings

The coatings are classified according to the mounting location of the automotive plastic parts and the ambient conditions. Classification, code, service condition and application example of coatings are given in Table 1.

Table 1 Classification, code, service condition and application example

Classification Code Service condition Application example

Interior plastic parts A-1 Under direct sunlight exposure and high temperature Instrument panel assembly, sun visor bracket, inner rear-view mirror housing and rear package tray, etc.

A-2 Under direct sunlight exposure and relatively high temperature Instrument panel vertical surface, steering wheel, floor console assembly, door trim, upper pillar trim, glasses case, central control panel, seat guard board, door handle (including roof grab handle), etc.

A-3 Without direct sunlight exposure Lower pillar trim, sill, seat guard board, etc.

Exterior plastic parts B-1 Under direct sunlight exposure and high temperature Antenna cap, sunroof top cover, company logo, word mark, washer nozzle, bumper, front outer panel, trim cover (strip), air director, fender, side trim cover, sill trim panel, pillar trim panel, side guard, outer rear-view mirror housing, windshield trim panel, deflector channel cover, etc.

B-2 Under direct sunlight exposure and near the engine heat source Radiator cover, fog light, grille, etc.

B-3 Without direct sunlight exposure Wheel cover, fender, tread plate trim cover (commercial automobile), etc.

Underhood plastic parts C-1 Under direct contact with engine heat source Engine trim cover, etc.

C-2 Under indirect contact with engine heat source Various protective guards, etc.

5 Technical requirements

2 Thickness, µm In accordance with the product requirements GB/T 13452.2

3 Cross cut test Grade 1 or better GB/T 9286

4 Hardness, N >=10, the coating is free from damage, with slight traces allowed. See Subclause 6.2

5 Heat resistance a After storage at 110°C±2°C for 120 h, the coating has no change in appearance and its cross cut test is of Grade 1 or better. After storage at 80°C±2°C for 120 h, the coating has no change in appearance and its cross cut test is of Grade 1 or better. After storage at 70°C±2°C for 120 h, the coating has no change in appearance and its cross cut test is of Grade 1 or better. GB/T 1735

6 Temperature resistance a No cracking, staining or other damage; with slight change in color and gloss allowed; the cross cut test is of Grade 1 or better See Subclause 6.3

7 Moisture resistance After being conditioned for 24 h after the test duration of 240 h, no blistering or change in color; and the cross cut test and the hardness test are in accordance with those specified in Items 3 and 4 in this table. GB/T 13893

ISO 4628-2

8 Abrasion resistance In accordance with the product requirements GB/T 1768

9 Surfactant resistant At normal temperature for 8 h, with neutral washing liquid, no blistering, peeling, swelling, softening or other damage as well as no obvious change in color and gloss. Sbuclause 5.4

In GB/T 9274-1988

10 Windshield washer fluid resistance At normal temperature for 8 h, with the windshield washer fluid given in GB/T 23436, no blistering, peeling, swelling, softening or other damage as well as no obvious change in color and gloss. Subclause 5.4

In GB/T 9274-1988

11 Moisturizer resistance With improvement in gloss allowed, but change in color and hand feeling not allowed. The cross cut test and the hardness test are in accordance with those specified in Items 3 and 4 in this table. - See Subclause 6.4

12 Artificial sweat resistance No obvious change in appearance - See Sublcause 6.5

13 Artificial radiation exposure 500 h 300 h - See Subclause 6.6

The decorative films have a comprehensive rating of 0, and the cross cut test and the hardness test are in accordance with those specified in Items 3 and 4 in this table.

Note: a test temperature is recommended under normal circumstances. Other agreed test temperatures may be used depending on the materials of the plastic parts, however, it shall be indicated in the test report.