通用公司标准GMW 15814-2008 塑料材料规范-聚烯烃类部分交联热塑性弹性体

VIP免费

venus 2025-11-14 14 70.33KB 5 页 16星币

侵权投诉

WORLDWIDE

ENGINEERING

STANDARDS

Material Specification

Plastics GMW15814

Thermoplastic Elastomers - Polyolefinic, Partially Crosslinked

September 2008 Originating Department: North American Engineering Standards Page 1 of 5

1 Scope

1.1 Material Description. This specification covers

the properties of black, general purpose, heat

stabilized, and thermoplastic vulcanizates

containing partially crosslinked Ethylene-

Propylene-Diene Monomer (EPDM) elastomer

particles dispersed in a continuous Polypropylene

(PP) matrix. These materials can be processed by

extrusion and injection molding.

Material types are delineated by hardness values.

The types and corresponding hardnesses available

are identified in Appendix A, Table A1.

1.2 Symbols. The material abbreviation according

to ISO 18064 is >TPV-(EPDM + PP) <.

1.3 Typical Applications. Typical applications

include the following: seals and gaskets.

2 References

Note: Only the latest approved standards are

applicable unless otherwise specified.

2.1 External Standards/Specifications.

ISO 34-1 ISO 1183

ISO 37 ISO 1431-1

ISO 105-B06 ISO 18064

ISO 188 SAE J1756

ISO 812 SAE J1976

ISO 815 SAE J2527

ISO 868

2.2 GM Standards/Specifications.

GMW3001 GMW3059

GMW3013 GMW3221

3 Requirements

Materials approved to this specification shall meet

the requirements of GMW3013, General

Requirements for Handling of Technical Terms

of Delivery for Plastics.

3.1 Requirements on Delivery. Important

physical, mechanical and thermal properties that

characterize the material are summarized in

Table 1.

Note: For each product, the requirements to

Table 1 shall be documented by Certification

Statement according to GMW3013. The color shall

be specified on drawings, in material specifications

and otherwise.

3.2 Requirements on Test Specimens. Tests

shall be conducted using the latest issue of the test

methods indicated. Suitable precautions should be

taken to ensure that applicable safe limits are not

exceeded when conducting test procedures,

processes, and/or handling the materials required

by this specification.

3.2.1 Tests specimens shall be die cut from fan

gated injection molded plaques having a nominal

thickness of 2.0 ± 0.2 mm. Die cut specimens are

to be tested with the long axis of the test specimen

perpendicular to the direction of flow. Plaque

dimensions must be sufficient to permit this.

3.2.2 Tests shall be conducted 40 h minimum after

molding and immediately following a conditioning

period of 24 h minimum per GMW3221, Code A,

unless otherwise specified. All tests shall be

performed on unannealed specimens. In addition,

tests specified at temperatures below or above

22 ± 3°C shall be conducted at the specified

temperature using specimens conditioned at the

specified temperature for 4 h minimum.

3.2.3 The minimum values specified in the property

tables must be met by test specimens in natural,

black, or in a standard sampled color if natural or

black are not available. For colored grades where

other pigment and additive systems (e.g.,

stabilizer) are used, the impact values shall not

decrease more than 10% from the specified

minimum value.

3.3 Compound Properties. See Table 1. A

minimum of six lots shall be tested to Table 1. The

following are also required for full specification

approval (the minimum number of lots per test

required is one):

• Young’s Modulus

• Poisson’s Ratio

• Coefficient of Linear Thermal Expansion

(CLTE)

• Stress-Strain Curve at 23°C

GMW15814 GM WORLDWIDE ENGINEERING STANDARDS

Page 2 of 5 September 2008

• Differential Scanning Calorimetry (DSC) Curve

• Thermogravimetric Analysis (TGA) Curve

• Infrared Spectroscopy (IR) Curve

Table 1: Compound Properties (Black)

Property Test Method Unit Type 3 Type 5 Type 6

Shore A

Hardness

ISO 868,

15 second

delay Shore A 45 ± 5 65 ± 5 75 ± 5

Specific Gravity ISO 1183 0.93 to 1.05 0.97 to 1.04 0.96 to 1.02

Tensile Stress

at Break

ISO 37, Type 1

dumbbell,

500 mm/minute MPa 2.1 minimum 3.3 minimum 4.5 minimum

Elongation at

Break

ISO 37, Type 1

dumbbell,

500 mm/minute % 200 minimum 380 minimum 490 minimum

Tensile Stress

at 100%

Elongation

ISO 37, Type 1

dumbbell,

500 mm/minute MPa 0.8 minimum 2.0 minimum 2.8 minimum

Compression

Set

ISO 815,

Type A, 22 h at

70°C % 45 maximum 45 maximum 55 maximum

Tear Strength

ISO 34-1,

Method B,

angle die,

500 mm/minute

kN/m 8 minimum 21 minimum 30 minimum

Low

Temperature

Brittleness

ISO 812,

Type B °C -54 maximum

Properties After

Heat Aging ISO 188,

1000 h at

120°C in an

air-circulating

oven followed

by indicated

property testing

at 23°C. Test

methods are

the same as for

original

mechanical

property

testing.

Change

Property

Tensile

Stress

Elongation at

Break

No objectionable color change or tackiness

75 retention minimum

GM WORLDWIDE ENGINEERING STANDARDS GMW15814

September 2008 Page 3 of 5

Property Test Method Unit Type 3 Type 5 Type 6

Ozone

Resistance

ISO 1431-1,

Procedure A,

100 pphm,

40°C

Zero Rating

Fogging

Number

SAE J1756

Photometric

Procedure, 6 h

at 102 ± 0.5°C

heating bath

temperature,

38 ± 0.5°C

cooling

temperature on

glass plate,

16 h recovery

time.

70 minimum

Samples that result in a residue that forms a transparent film,

discernible droplets, or any visual signs of crystallinity, when

viewed under 40X magnification shall be judged to have not

passed this requirement.

Colorfastness

to Light

ISO 105-B06

Condition 5,

rotating rack

1 rpm,

1240.8 kJ/m2

Change in

Color

Surface

Defects

ΔE < 3.0

No objectionable defects allowed

Accelerated

Weathering

SAE J2527

with Extended

UV Filters,

2500 kJ/m2

Change in

Color

Surface

Defects

ΔE < 3.0

No objectionable defects allowed

Natural

Weathering

Note 1

2 years

exposure to

natural

weathering in

Arizona and

Florida per

SAE J1976,

Procedure A

Color Change

Surface

Defects

ΔE < 3.0

No objectionable defects allowed

Note 1: In case of conflict between accelerated weathering and natural weathering, natural weathering takes precedence.

文档加载中……请稍候！
如果长时间未打开，您也可以点击刷新试试。

下载文档到电脑，查找使用更方便

亲，本站95%以上的标准规范都面向会员免费，办理VIP会员下载更省钱，平均每篇不到2元

立即下载 VIP免费下载

标签： #塑料 #塑料材料 #弹性体

摘要：

GMW 15814-2008是通用汽车公司发布的塑料材料标准规范，专门针对聚烯烃类部分交联热塑性弹性体（TPE）的技术要求与测试方法。该标准规定了材料的拉伸强度、断裂伸长率、硬度、耐热老化、耐油性以及压缩永久变形等关键性能指标，适用于汽车内饰、外饰及密封系统等零部件的材料选型与质量管控。通过遵循GMW 15814-2008，企业能够确保所用聚烯烃基热塑性弹性体在耐候性、柔韧性及加工稳定性方面满足通用汽车严格的行业标准，同时为材料供应商、OEM厂商及检测机构提供统一的技术依据，有助于降低供应链风险

展开>> 收起<<

通用公司标准GMW 15814-2008 塑料材料规范-聚烯烃类部分交联热塑性弹性体.pdf

共5页,预览3页

还剩页未读，继续阅读

声明：本文档系会员上传，若文档所含内容侵犯了您的版权或隐私，请立即通知，我们立即给予侵权申诉删除！

通用公司标准GMW 15814-2008 塑料材料规范-聚烯烃类部分交联热塑性弹性体

相关推荐

开通VIP享超值会员特权

相关内容

热门标签

举报选择: