ISO 34-1, Rubber, vulcanized or thermoplastic \u2014 Determination of tear strength \u2014 Part 1: Trouser, angle and crescent test pieces
\nISO 37, Rubber, vulcanized or thermoplastic \u2014 Determination of tensile stress-strain properties
\nISO 188, Rubber, vulcanized or thermoplastic \u2014 Accelerated ageing and heat resistance tests
\nISO 815-1, Rubber, vulcanized or thermoplastic \u2014 Determination of compression set \u2014 Part 1: At ambient or elevated temperatures
\nISO 1431-1, Rubber, vulcanized or thermoplastic \u2014 Resistance to ozone cracking \u2014 Part 1: Static and dynamic strain testing
\nISO 7619-1, Rubber, vulcanized or thermoplastic \u2014 Determination of indentation hardness \u2014 Part 1: Durometer method (Shore hardness)<\/p>\n
Item 4 (ISO 14409) Classification of ship launching airbags<\/strong><\/h4>\nThis standard categorizes airbags according to their bearing capacity, per meter in length: QP means ordinary airbags with less than 6 reinforcement layers (cord rubber layers). QG means high performance airbags with 6 reinforcement layers (cord rubber layers).<\/p>\n
Anyway ISO 14409 doesn\u2019t literally indicate airbags with more than 6 reinforcement layers belong to QG type also. With more reinforcement layers, airbag will have higher bearing capacity. According the principle of airbag classification of ISO 14409, airbags with more than 6 reinforcement layers should belong to QG type.<\/p>\n
Item 5 (ISO 14409) Material and dimensions of ship launching airbags<\/strong><\/h4>\nIn the standard iso 14409, material for Ship launching airbag production is described as: An air bag is to be constructed of an outer rubber layer, one or more synthetic-tire-cord layers, and an inner rubber layer. All materials shall be vulcanized firmly.<\/p>\n
![\"Interpretation](\"\/wp-content\/uploads\/replace\/8f81f02c4a0c48d789ff0932fed073d2.jpeg\" "\\"\\"")
<\/a><\/p>\nThe reasons to list inner layers, outer layer and synthetic-tire-cord layers separately are: they have different functions and made of different material. Inner rubber layer for ship launching airbags is designed to have good airtightness performance, normally made of EPDM, NBR and NR rubber. Outer rubber layer needs to withstand abrasion and puncture, thus has some functional chemical and reinforcement material. Different manufactures have different designs for the outer layer of airbags, the rubbers formula and rubber contents decide airbag cost and the performance, life span as well.<\/p>\n
Insight of airbag structure<\/strong><\/h5>\nThe synthetic-tire-cord layers are compound of rubber and nylon cords, generally by calendering two material to combine them together firmly.<\/p>\n
The arrangement of synthetic-tire-cord reinforcement layers is the core technology of ship launching airbag manufacturers, most of them are protected by patents. Top airbag factories are using the \u201cenlacing method\u201d, wrap synthetic-tire-cord layers in s specific way to form seamless framework of airbags.<\/p>\n
Some factories are using the \u201csticking method\u201d to make airbag skeleton, sticking synthetic-tire-cord reinforcement layers together with 90-degree angle, just like stitching a cylindrical pillow if you take sticking as stitching. Obviously, the sticking method is not as good as enlacing method for airbag performance and safety, but it can save material and cost so still some airbag manufacturers are using this outdated producing method. The below picture shows the difefrence of layers arrangement of airbags produced by two different methods.<\/p>\n
In the standard iso 14409, material for Ship launching airbag production is described as: An air bag is to be constructed of an outer rubber layer, one or more synthetic-tire-cord layers, and an inner rubber layer. All materials shall be vulcanized firmly.<\/p>\n
The reasons to list inner layers, outer layer and synthetic-tire-cord layers separately are: they have different functions and made of different material. Inner rubber layer for ship launching airbags is designed to have good airtightness performance, normally made of EPDM, NBR and NR rubber. Outer rubber layer needs to withstand abrasion and puncture, thus has some functional chemical and reinforcement material. Different manufactures have different designs for the outer layer of airbags, the rubbers formula and rubber contents decide airbag cost and the performance, life span as well.<\/p>\n The synthetic-tire-cord layers are compound of rubber and nylon cords, generally by calendering two material to combine them together firmly.<\/p>\n The arrangement of synthetic-tire-cord reinforcement layers is the core technology of ship launching airbag manufacturers, most of them are protected by patents. Top airbag factories are using the \u201cenlacing method\u201d, wrap synthetic-tire-cord layers in s specific way to form seamless framework of airbags.<\/p>\n Some factories are using the \u201csticking method\u201d to make airbag skeleton, sticking synthetic-tire-cord reinforcement layers together with 90-degree angle, just like stitching a cylindrical pillow if you take sticking as stitching. Obviously, the sticking method is not as good as enlacing method for airbag performance and safety, but it can save material and cost so still some airbag manufacturers are using this outdated producing method. The below picture shows the difefrence of layers arrangement of airbags produced by two different methods.<\/p>\n<\/a><\/p>\nInsight of airbag structure<\/strong><\/h5>\n