mso-hansi-font-family:"Times New Roman"">一、橡膠壓縮永久變形器概述：

mso-hansi-font-family:"Times New Roman"">永久壓縮變形器由平行鋼板、插銷、限制器和緊固件組成, mso-hansi-font-family:"Times New Roman"">符合GB7759-2015 "Times New Roman"">、ISO815-1:2008 "Times New Roman"">要求,用于硫化橡膠, mso-hansi-font-family:"Times New Roman"">熱塑性橡膠在常溫, "Times New Roman"">高溫和低溫條件下, "Times New Roman"">以一定壓縮率, "Times New Roman"">經(jīng)一定的壓縮時(shí)間后測(cè)定橡膠變形。

mso-hansi-font-family:"Times New Roman"">二、橡膠壓縮永久變形器技術(shù)參數(shù)：

1、試樣 A mso-hansi-font-family:"Times New Roman"">型：真徑29mm, "Times New Roman"">高12.5mm "Times New Roman"">；B型：真徑13mm, mso-hansi-font-family:"Times New Roman"">高6.5mm

2、限制器高度? "Times New Roman"">試樣類型????????? ??A??????????????????? B

??????????? mso-hansi-font-family:"Times New Roman"">壓縮率為25% "Times New Roman"">時(shí)mm????? 9.3-9.4?????????? 4.7-4.8

??????????? mso-hansi-font-family:"Times New Roman"">壓縮率為15% "Times New Roman"">時(shí)mm????? 10.6-10.7?????? ??5.3-5.4

??????????? mso-hansi-font-family:"Times New Roman"">壓縮率為10% "Times New Roman"">時(shí)mm????? 11.25-11.3??????? 5.65-5.7

???? "Times New Roman"">硬度小于80IRHD "Times New Roman"">壓縮率為【25 "Times New Roman"">±2%】限制器

???? 80IRHD mso-hansi-font-family:"Times New Roman"">至89IRHD "Times New Roman"">壓縮率為【15 "Times New Roman"">±2%】限制器

???? 90IRHD "Times New Roman"">至95IRHD "Times New Roman"">壓縮率為【10 "Times New Roman"">±2%】限制器

3、外形尺寸：直徑110mm? "Times New Roman"">單板厚度15mm

4、重量： 10Kg

mso-hansi-font-family:"Times New Roman"">三、橡膠壓縮永久變形器使用方法：

1、在壓縮夾具的壓縮板表面上涂一層潤(rùn)滑劑( mso-hansi-font-family:"Times New Roman"">滑石粉、甲基硅油) "Times New Roman"">。使試樣不粘夾具。所用的潤(rùn)滑劑對(duì)試驗(yàn)中的橡膠無影響。并且在試驗(yàn)報(bào)告中注明所用的潤(rùn)滑劑。

2、調(diào)整厚度計(jì)指針為零, mso-hansi-font-family:"Times New Roman"">測(cè)量試樣中心部份的高度(h0) "Times New Roman"">。三個(gè)試樣高度相差不超過0.01mm "Times New Roman"">。

3、將試樣、限制器置于夾具中, mso-hansi-font-family:"Times New Roman"">均勻地壓縮到規(guī)定的高度(h0), "Times New Roman"">壓縮時(shí)試樣、限制器不能互相接觸。

4、把已裝有試樣的壓縮夾具或試驗(yàn)容器放入達(dá)到的試驗(yàn)溫度即開始計(jì)算時(shí)間。

5、常溫或高溫試驗(yàn)結(jié)束后, mso-hansi-font-family:"Times New Roman"">立即松開緊固件, "Times New Roman"">把試樣放置于木板上, "Times New Roman"">在標(biāo)準(zhǔn)溫度環(huán)境下, "Times New Roman"">自由狀態(tài)下放置(30 "Times New Roman"">±3)min, "Times New Roman"">然后用厚度計(jì)測(cè)量試樣恢復(fù)高度h1), "Times New Roman"">精確到0.01mm "Times New Roman"">。也可以讓整個(gè)壓縮夾具在室溫下冷卻30~120min, "Times New Roman"">再從壓縮夾具中取出試樣; "Times New Roman"">停放30min "Times New Roman"">測(cè)一試樣高度。但應(yīng)在報(bào)告中注明停放時(shí)間。

6、低溫試驗(yàn)報(bào)告后, mso-hansi-font-family:"Times New Roman"">在低溫箱中立即松開緊固件同時(shí)開始測(cè)量試樣高度(h2), mso-hansi-font-family:"Times New Roman"">如條件允許下最好每隔一段時(shí)間測(cè)量試樣的高度, mso-hansi-font-family:"Times New Roman"">時(shí)間分別為1Os "Times New Roman"">、30s、1min mso-hansi-font-family:"Times New Roman"">、3min "Times New Roman"">、10min、30min mso-hansi-font-family:"Times New Roman"">和2h "Times New Roman"">。這樣可繪出試樣高度與時(shí)間的對(duì)數(shù)曲線圖。取試樣應(yīng)使用鑷子鉗。

7、耐液體試驗(yàn)時(shí), mso-hansi-font-family:"Times New Roman"">先在試驗(yàn)容器內(nèi)放入液體, "Times New Roman"">液面為容器高度的二分之一, "Times New Roman"">然后把裝有試樣的壓縮具放入容器內(nèi)。試樣必須浸沒在液體中。試驗(yàn)用的液體不能重復(fù)使用。不同配方的試樣不可在同一試驗(yàn)容器中進(jìn)行試驗(yàn)。在液體中試驗(yàn)結(jié)束后, mso-hansi-font-family:"Times New Roman"">將試驗(yàn)容器冷卻至接近室溫, "Times New Roman"">再把壓縮夾具從容器中取出, "Times New Roman"">夾具可用汽油等洗滌, "Times New Roman"">時(shí)間不超過30s "Times New Roman"">，然后按本標(biāo)準(zhǔn)7.5.1 "Times New Roman"">進(jìn)行測(cè)量,并在報(bào)告中注明試驗(yàn)容器的冷卻時(shí)間。

8、整個(gè)試驗(yàn)結(jié)束后，檢查試樣內(nèi)部有否缺陷、氣泡，反之，試樣作廢。

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