Technical Requirements for the EPDM Waterproof Sealing Rubber Strip

Table of Contents
1 General Requirements 13
1.1 Engineering Requirements for Materials 13
1.2 Requirements for the Cross Section 13
1.3 Requirements for making model 15
1.3.1 Foam strip requirements for making model 15
1.3.2 Rubber requirements for making model 15
2 Technical Requirements and Inspection Methods 15
2.1 Physical Performance of a Sealing Rubber Strip 15
2.2 Performance of Rubber Adhesives 17
3 Mark, Package, Transport, and Storage 18
3.1 Mark 18
3.2 Packing 18
3.3 Transport and Storage 19
4 Note 19

List of Tables
Table 1 Physical requirements for the materials of a vulcanized sealing rubber strip 16
Table 2 Physical requirements for the rubber adhesive of a vulcanized sealing rubber strip 17

List of Figures
Figure 1. HW01 13
Figure 2. HW02 13
Figure 3. HW03 13
Figure 4. HW04 14
Figure 5. HW05 14
Figure 6. HW06 14
Figure 7. HW07 14
Figure 8. HW08 15

EPDM防水密封胶条技术要求
 Technical Requirements for the EPDM Waterproof Sealing Rubber Strip
 

Scope
This document defines the terms related to the sealing rubber strips used in Huawei communication cabinets and specifies the general requirements, technical requirements, test methods, inspection rules, mark, package requirements, transport requirements, and storage requirements for the rubber strips.
This document is applicable to vulcanized sealing rubber strips, but not applicable to bubble or composite sealing rubber strips.
Key words
EPDM ；water-proof；sealing strip
Referenced Documents
The following normative documents contain provisions which, through reference in this text, constitute provisions of this specification. For dated references, subsequent amendments, excluding corrections, to, or revisions of, any of these publications do not apply. However, parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the normative documents. For undated references, the latest edition of the normative document referred to applies.
No. Doc No. Doc Title Equivalent
1 ISO 37 Rubber, Vulcanized or Thermoplastic—Determination of Tensile Stress-Strain Properties GB/T528
2 ISO7619 Rubber—Determination of Indentation Hardness by Means of Pocket Hardness Meters GB/T531
3 ISO3302-1 Tolerance of Rubber Manufactures   Part I  Dimensions Tolerance GB/T3672.1
4 ISO3302-2 Tolerance of Rubber Manufactures   Part I  Geometric Tolerance GB/T3672.2
5 ASTM D3330M American Society For Testing Materials GB2792
6 GB4852 Test Method for Initial Adhesive Power of Pressure Sensitive Adhesive Tapes GB4852
7 ASTM D3654 American Society For Testing Materials GB4851
10 IEC68-2-10 Environmental testing for electric and electric products-part 2 GB/T2423.16
11 UL94 Test for Inflammability of Plastic Components 
12 UL60950 Safety Information About Information Technology Equipment 
13 ASTM American Society For Testing Materials 
14 QC/T643 Test Methods for Pollution of Vehicle Used Sealing Strips QC/T643

Term&Definition
Term Definition
Resilience Restoration
 The capability of the sample or manufacture of a sealing rubber strip to be restored to its natural height after being compressed.
Natural Height The height of a sample or manufacturer of a sealing rubber strip without any load.
Operation Scope
 The distance for which a sealing rubber strip can be compressed when the cabinet door is close or other components are assembled.

General Requirements
Engineering Requirements for Materials
　　The base material of a sealing rubber strip is the black ethylene propylene diene M-class (EPDM) rubber.
　　A sealing rubber strip is extruded through microwave vulcanization.
Requirements for the Cross Section
　　A sealing rubber strip is a vulcanized strip with rubber on both sides. A sealing rubber strip have two types. The first type is the foam strip, the cross section of foam strip are HW01,HW02,HW03,HW04,HW05,HW06 and HW07 .The second type is close-grained  strip , the cross section of close-grained strip is HW08 ；

HW01

HW02

HW03

HW04

HW05

HW06

HW07

HW08
Requirements for making model
Foam strip requirements for making model
　　HW01, HW02, HW03, HW04, HW05, HW06 and HW07 use below requirements.
　　　name：DKBA04801496_HW0X_L （notes：X：the type of rubber strip，L：length）
　　　Ptc_common_name ：EPDM sealing strip HW0X_L
　　　Pcode：DKBA0.480.1496
　　
Close-grain strip requirements for making model
　　HW08 use below requirements.
　　　name：DKBA04801496_HW0X_WxH
　　（notes：X：the type of rubber strip，W：the max width, H：the max height,）
　　　Ptc_common_name ：EPDM sealing strip HW0X_ WxH
　　　Pcode：DKBA0.480.1496
　　
Technical Requirements and Inspection Methods
Physical Performance of a Sealing Rubber Strip
　　Table 1 describes the physical requirements for the materials of a vulcanized sealing rubber strip.
Physical requirements for the materials of a vulcanized sealing rubber strip
Item Requirement Inspection Basis
 Foam strip Close-grained strip 
Appearance Smooth Without distortion, cracks, bulbs, bubbles, obvious impurities, and defects ， Color in even eye estimate
Dimensions tolerance Dimensions tolerance of the cross section E2 (good quality) ISO3302-1
 Geometric tolerance Level N ISO3302-2
Hardness  (shore A) 10±2（others） 60±5 GB/T 531
 12±3（HW04）  
Tensile strength  (Mpa) ≥0.8 ≥ 9 GB/T 528
Break elongation (%) ≥300 ≥400 
Aging in air (80°C, 168 hours) Hardness  change  (shore A) ±5 ±5 GB/T 3512
 Tensile strength  retain（%） ≥85 ≥85 
 Break elongation retain (%) ≥75 ≥75 
 Heating mass lose（%） ≤3 ≤3 
Water Resistant（80±2）℃/120h Hardness  change  (shore A) ±5 ±5 QC/T 639  using method 4.3.4
 Tensile strength  retain（%） ≥85 ≥85 
 Break elongation retain (%) ≥75 ≥75 
Ozone aging
Holding elongation at 20% （40±2）℃/72h ，Ozone concentration at （2±0.2）× 10-6 No cracks are found on the surface under the examination of a 2x magnifying glass No cracks are found on the surface under the examination of a 2x magnifying glass GB/T 7762-2003 method A
Ultraviolet aging（Tensile strength  retain %） ≥95 ≥95 ISO4892-2/cycle1,1000h
Tearing strength（KN/m） ≥ 2 ≥20 GB/T 529
Flame retardance HF－1 HB UL94
Mold resistance Level 1  1级 IEC68-2-10
compress set（%） (23±2）℃/22h/50% ≤15 ≤15 GB/T 7759
 (80±2）℃/22h/50% ≤25 ≤25 
Joint force(N) (23±2）℃ / ≥70 GB/T 528(Joint sample)
Pollution and compatibility No dark outline or solid impression is left on cabinet surface after inspection. The surfaces of cabinets or strip samples shall not froth, be sticky, or be uneven. QC/T643 (The sample board sprayed with the powder agreed by Huawei to be used on outdoors communication cabinets shall be used in inspection.)
shock resistance test NO crack EN/IEC/UL60950-22
　　Note：HW08 strip should drill some holes inside of strip. The distance recommend 300mm.
Performance of Rubber Adhesives
　　Table 2 describes the physical requirements for the rubber adhesive of a vulcanized sealing rubber strip.
Physical requirements for the rubber adhesive of a vulcanized sealing rubber strip
NO． Item Bonding object Test condition Standard Requirement
1 Holding power Powder Coated specimen   Bonding at 24h，25℃，65%RH，bonded area （25mm×25mm），80℃，holding 0.5kg，record the time until droped. GB 4851 200min
  Powder Coated specimen   Bonding at 24h，25℃，65%RH，bonded area（12.5mm×25mm），holding 1kg, record the time until droped. GB 4851 600min
2 Fast adhesive force Powder Coated specimen Bonding at 15min，25℃，65%RH ASTM D3330 method C ＞0.5 N/mm
3 Max adhesive force Powder Coated specimen Bonding at 24h，25℃，65%RH ASTM D3330 methd C ＞0.7 N/mm
  EPDM foam strip Bonding at 24h，25℃，65%RH，when tape was removed，EPDM was teared to pieces 　 yes
3 Aging of tape Powder Coated specimen Bonding at 24h，when suffered 80℃/168 heat ageing，then return to normal,and test the 180 peel power retain  ASTM D3330 method C ≥90%
    Bonding at 24h，-40℃/48h，then return to normal,and test the 180 peel power retain ASTM D3330 method C ≥90%
   Bonding at 24h，one cycle contain 80℃/4h，-40℃/4h，25℃/16h.The rate of
Temperature rising is （5±1）℃/min，The test contains  3 cycles，then return to normal,and test the 180 peel power retain. ASTM D3330 method C ≥90%
   Bonding at 24h，66℃/Rh80%/96h, then return to normal,and test the 180 peel power retain. ASTM D3330 方法C ≥90%
  EPDM foam Strip  Bonding at 24h，when suffered 80℃/168h, then return to normal, remove 50mm tapes，EPDM was teared to pieces. 　 yes
   Bonding at 24h，-40℃/48h，then return to normal，remove 50mm tapes，EPDM was teared to pieces. 　 yes
   Bonding at 24h，one cycle contain 80℃/4h，-40℃/4h，25℃/16h.The rate of
Temperature rising is （5±1）℃/min，The test contains  3 cycles，then return to normal, remove 50mm tapes，EPDM was teared to pieces. 　 yes
   Bonding at 24h，66℃/Rh80%/96h, then return to normal, remove 50mm tapes，EPDM was teared to pieces. 　 yes
Mark, Package, Transport, and Storage
Mark
　　The following items shall be marked on the obvious parts of products or packages:
Name and logo of the manufacturer
Name, type, sign, and quantity (or quality) of the product
Number of this specification
Manufacturing date and inspection batch number or code
Packing
　　Sealing rubber strips shall be flat and twine around hard plates without distorted, and be put into packing cartons or bags by type and specification. The net weight of each carton or bag shall not be more than 30 kg.
　　Packing cartons shall be made of corrugated boxes, wooden cases, or fiberboard boxes enhanced by board strips. Packing cartons shall be configured with crate liners made of brown paper or thin plastic film. The liners shall be bound fixedly. The supplier and demander shall negotiate for special requirements.
　　Quality certificates shall be attached to packed products.
　　HW08 strip with joint should not bend and twine. It should be packaged by corrugated boxes or bracket, and be put regular.
　　
Transport and Storage
　　Water and moisture prevention measures shall be taken during the transport and storage of strips. Keep the storage house well-ventilated and dry and protect strips from corrosion. Strips are allowed to be piled for a maximum of five tiers and stored for not more than one year.
Note
　　The MPE System Department. of Huawei reserves the right to finally interpret the technical requirements.