{"id":2225,"date":"2016-10-28T14:25:56","date_gmt":"2016-10-28T18:25:56","guid":{"rendered":"http:\/\/lanotr.com\/?p=2225"},"modified":"2016-10-31T11:59:14","modified_gmt":"2016-10-31T15:59:14","slug":"deuxieme-partie","status":"publish","type":"post","link":"https:\/\/lanotr.com\/fr\/deuxieme-partie\/","title":{"rendered":"Est-ce vrai que caoutchouc \u00ab Cheap \u00bb = Caoutchouc synth\u00e9tique? Deuxi\u00e8me Partie"},"content":{"rendered":"

N\u2019oubliez pas nos RABAIS actuels\u2026 LanOTR\u00a0: la qualit\u00e9 des grandes marques et significativement moins cher que le pneu \u00ab\u00a0chinois\u00a0\u00bb!!<\/strong><\/p>\n

 <\/p>\n

Est-ce vrai que bon caoutchouc = duro \u00e9lev\u00e9?<\/strong><\/p>\n

Partie 2\/2.<\/strong><\/p>\n

 <\/p>\n

En juillet \"1\"dernier je vous expliquais la base des ingr\u00e9dients qui entrent et font varier les propri\u00e9t\u00e9s du caoutchouc et je vous ai fait remarquer\u00a0que ce n\u2019est pas aussi simple que de dire que le caoutchouc \u00ab\u00a0cheap\u00a0\u00bb est fait de synth\u00e9tique. Aussi j\u2019entends parfois qu\u2019un bon caoutchouc = duro \u00e9lev\u00e9\u2026 rien n\u2019est plus faux!!! Il convient maintenant de vous dire comment les caoutchoucs sont test\u00e9s chez LanOTR\u00a0:<\/p>\n

 <\/p>\n

Le duro n\u2019est rien d\u2019autre que la mesure de \u00a0duret\u00e9 d\u2019un mat\u00e9riel semi-solide. Ainsi de l\u2019acier ou de la vitre auront un duro de 100% et un liquide 0%. G\u00e9n\u00e9ralement dans le pneu j\u2019ai observ\u00e9 des duros de 55 \u00e0 75 et ce, peu importe la marque et\/ou l\u2019application des pneus. Donc si le duro n\u2019est pas la mesure\u2026 quelles sont donc ces propri\u00e9t\u00e9s qui sont si importantes\u00a0:<\/p>\n

1. Capac\"2\"it\u00e9 du mat\u00e9riel \u00e0 s\u2019\u00e9tirer sans d\u00e9chirer\u00a0: Surtout dans le cas des pneus, on veut que le caoutchouc puisse s\u2019\u00e9tirer \u00e0 l\u2019extr\u00eame avant de d\u00e9chirer et ainsi avoir une perforation. Il existe donc des tests standards pour comparer les compos\u00e9s entre eux. On voudra donc maximiser cette valeur pour que la force n\u00e9cessaire \u00e0 la d\u00e9chirure soit la plus grande possible et qu\u2019avant le d\u00e9chirement le mat\u00e9riel ait \u00e9t\u00e9 en mesure d\u2019\u00e9tirer \u00e0 l\u2019extr\u00eame.<\/p>\n

2. Capacit\u00e9 du mat\u00e9riel \u00e0 dissiper la chaleur\u00a0: On sait que pour le caoutchouc, chaleur = vulcanisation. Donc un pneu en surchauffe atteindra le point o\u00f9 le caoutchouc se mettra \u00e0 vulcaniser il devient donc friable et se d\u00e9composera \u00e0 l\u2019extr\u00eame ce qui provoquera une usure pr\u00e9matur\u00e9e et surtout des s\u00e9parations. Il existe donc des tests standards o\u00f9 on mesure l\u2019\u00e9nergie conserv\u00e9e dans un mat\u00e9riel. Le principe est de laisser tomber une masse standard sur le mat\u00e9riel d\u2019une hauteur standard. Ainsi plus la masse remonte \u00e0 la hauteur originale, moins le mat\u00e9riel a conserv\u00e9 d\u2019\u00e9nergie et moins il chauffera. Cette propri\u00e9t\u00e9 d\u00e9pend de la structure chimique et donc des ingr\u00e9dients utilis\u00e9s.<\/p>\n

3. Test d\u2019abrasion\u00a0: Une des qualit\u00e9s premi\u00e8res d\u2019un pneu est d\u2019user lentement. Il convient donc\u00a0d\u2019utiliser des tests standards \"3\"<\/a>pour user des \u00e9chantillons de caoutchoucs. Il faut aussi les tester \u00e0 diff\u00e9rents angles, car le caoutchouc poss\u00e8de de tr\u00e8s longues mol\u00e9cules et en fonction de son m\u00e9langeage et de la production, ces mol\u00e9cules auront tendance \u00e0 \u00eatre plus ou moins align\u00e9es, ce qui modifiera consid\u00e9rablement la r\u00e9sistance \u00e0 l\u2019abrasion sous certains angles.<\/p>\n

 <\/p>\n

 <\/p>\n

Dans notre cas, nous ajoutons r\u00e9guli\u00e8rement des tests ponctuels tels que le changement des propri\u00e9t\u00e9s suite \u00e0 des temp\u00e9ratures ext\u00e9rieurs de -40 \u00e0 +40 degr\u00e9s Celsius, la r\u00e9sistance aux hydrocarbures tels que de l\u2019huile ou de l\u2019essence en cas de d\u00e9versement venant de l\u2019\u00e9quipement (ex\u00a0: \u00ab\u00a0bearing\u00a0\u00bb de roue) et d\u2019autres\u2026<\/p>\n

Pour tout vous dire j\u2019aurais bien aim\u00e9 que le duro puisse tout r\u00e9v\u00e9ler, comme ce serait facile! Mais non, il convient d\u2019\u00eatre plus syst\u00e9matique et ce n\u2019est qu\u2019un d\u00e9but!<\/p>\n

Daniel Marleau \u2013 PDG LanOTR<\/p>\n","protected":false},"excerpt":{"rendered":"

N\u2019oubliez pas nos RABAIS actuels\u2026 LanOTR\u00a0: la qualit\u00e9 des grandes marques et significativement moins cher que le pneu \u00ab\u00a0chinois\u00a0\u00bb!!   Est-ce vrai que bon caoutchouc = duro \u00e9lev\u00e9? Partie 2\/2.   En juillet dernier je vous expliquais la base des…<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[],"class_list":["post-2225","post","type-post","status-publish","format-standard","hentry","category-non-classe-fr"],"yoast_head":"\nEst-ce vrai que caoutchouc \u00ab Cheap \u00bb = Caoutchouc synth\u00e9tique? 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