Rubber O-Ring-Silicone RTV Rubber Moulds And Mould Making Compounds

RTV-2 silicone rRubber Gasketubbers are pourable， spreadable or kneadable compounds， which will crosslink in the presence of a second component to form flexible rubbers。 They are outstanding as mould-making materials because of their excellent properties:

• Easy to use

• Excellent release properties

• Accurate reproduction of surface details

• Good heat resistance

• Little or no shrinkage
ubbers can also be use for encapsulation and sealing， or for making flexible parts。
ubbers always consist of two components， namely the rubber base itself and a catalyst， or the components A and B。 They are cured or vulcanised at room temperature (RTV= room temperature vulcanising)。

Different grades are available， with different properties suitable for a wide range of applications。 They can be classified according to the following criteria。

1。 Vulcanising system (condensation-curing or addition-curing)

2。 Consistency (pourable， spreadable or kneadable)

3。 Mechanical properties of the curedCustom Mold Rubber Parts rubbers (e。g。 tear resistance and elasticity)

Condensation-curing RTV-2 silicone rubbers

These cure at room temperature after addition of catalyst， volatile alcohols being liberated during the reaction。 Shrinkage occurs， which is completed after about a week。 Although not very effective， the vulcanising process can be speeded up by heating。 The temperature should under no circumstances exceed 70oC。 It is also most important that freshly made moulds， i。e。 which still contain the alcohol produced during the curing reaction， are not subjected to temperatures higher than 80oC， since this would cause a loss of elasticity and softening or stickiness of the silicone rubber (see also Mould pre-treatment)。

Addition-curing RTV-2 silicone rubbers

These vulcanise without the formation of reaction products， so that there is practically no shrinkage。 The cured rubbers can therefore be used immediately after they are fully cured。 Vulcanisation can also take place at higher temperatures (up to 200oC) which greatly reduces the required curing timeRubber Seal。 In this case however， one must take the high coefficient of thermal expansion of silicone rubber into account。

Cleanliness is especially important when processing addition-curing RTV-2 rubbers， since the platinum catalyst can lose its power through contamination。 Catalysts used for condensation-curing silicone rubbers， for example， can interfere with vulcanisation already in small amounts。 Furthermore， vulcanisation of addition-curing rubbers can be delayed or completely prevented if they are in contact with certain materials such as natural and synthetic rubbers， PVC， amine-cured epoxy resins， plasticine， adhesives， soldering tin etc。 Preliminary tests are therefore vitally important。

Storage stability

RTV2 silicone rubbers will remain in usable condition for at least 12 months， provided they have been stored cool and dry， in tightly closed containers。 The T series of catalysts have a shelf life of at least 6 months in closed containers， and should be protected from heat and moisture。 All containers should be tightly re-sealed every time some of their components have been removed。
ubbers and food regulations

Finished products made from addition-curing silicone rubbers are suitable for food contact applications in compliance with food regulations。

Condensation-curing RTV-2 silicone rubbers

These are vulcanised by adding a liquid or paste-like catalyst。 The pot life of the resultant mix， as well as its vulcanising time， will vary between a few minutes and several hours， depending on the type of catalyst and the amount used， the ambient temperature and relative humidity， as well as the amount of movement in the air。 Optimum characteristics of the cured rubber can only be achieved if a suitable catalyst is used in the prescribed amounts。

Addition-curing RTV-2 silicone rubbers

Here the mixing ratio for components A and B is fixed and must be adhered to precisely in order to achieve the desired end product properties。

Preparation of components

All pourable components should be stirred thoroughly before use to ensure even distribution of the filler。 Stirring also improves flow in higher viscosity systems。

Mixing of components

Even mixing of the rubber base and catalyst (in the case of condensation-curing rubbers) or the components A and B (in the case of addition-curing rubbers) is easily achieved for pourable and spreadable compounds， using a spatula。 Larger batches are best mixed with a mechanical stirrer。 Kneadable compounds can be mixed by hand， on the rolls or in a compounder， depending on the size of the batch。

Removal of entrapped air

To ensure bubble-free moulds， pourable mixes should be deaerated under vacuum。 The catalysed mix is poured into a vessel so that it is no more than a quarter full。 A vacuum of 10 - 20 mbar is then applied which initially causes the mix to rise， usually collapsing before the vessel´s rim has been reached。 If， however， there are signs that the mix will run over， a small amount of air is introduced and the process is repeated until the mix collapses。 Evacuation is discontinued immediately afterwards， in other words the mix should under no circumstances be evacuated until no more bubbles form， since certain substances essential for vulcanisation to take place could escape under these conditions。

Application to the pattern

A thickening of the catalysed mix marks the start of vulcanisationRubber O-Ring。 The material should be used well before the pot life has expired， i。e。 whilst it is still in a free-flowing state which makes application that muchRubber Parts easier。 Every increase in temperature reduces the pot life。

Video wall-5 Things to Know About Fanless Medical Computers

The reason inforsunlight readablemation technology is such a success today is because of computers。 The evolution of computers has helped mankind in ways more than one。 Today， the most complicated work is done in a matter of few secondsAll in one computer， all thanks to the computer technology。 We， humans have become totally dependent on computers because we use it everywhere。 Computers have become an integral part of all sectors， public and private included and the medical sector is no different。

Actually， the introduction of computers in the medical sector has only made the health care facilities more efficient in fulfilling their duties。 From storing data， to helping diagnosing the patients， medical PCs have come a long way to benefit the mankind。 If you are a part of a health care facility and are looking to upgrade your infrastructure then considering fanless medical computers isn´t a bad idea，

On a more serious note， if youpanel PC are considering such PCs then here are 5 things you must know before buying computers for hospitals:

• Computers help storing in important data in a more expeditious manner。 Maintaining registers for all information is a headache。 Computersdigital signage efficiently store data like patients´ personal information， prescriptions， their cases or sicknessFanless pc， and the kind of medication prescribed to the patient。 Also there is no difficulty in retrieving any information at any time。

• Medical computers can be used for the purpose of imaging (MRI， Ultrasound， and CT scan etc。) because it is crucial especially in the process of scanning。 In this process oftouch screen monitor imaging hospitals useIP66 different types of special gadgets to click an image of our different organs and bones as per the requirement。

•Industrial pc Gone are the days， when doctors had to be present near the patient to perform any operations or any check-ups。 Today in the age of this cutting-edge technology， operations have been made computerized。 With the useIndustrial monitor of medical PCs， health care facilities are now using technology and modern methods of treatments， where the doctor doesn´t has to be physically present。 The doctors can perform their duties far from the patient。

• With the help of computers，Video wall internal diagnosis has also been made computerized。 Some cases require the doctor to perform an internal diagnosis to catch the reason behind the patient´s illness。 This diagnosis also helps the doctor understand what the condition of their patients is。 Doctors conduct internal diagnosis throughBox PC computers so that they are sure of their patient´s situation。 Without such diagnosis， delay can happen in the treatment or wrong treatment may be given to the patient leading to serious consequences。

sintered metal-Test Strips for Carbon-Fired Metal Clays

Ever since I´ve sintered metalbeen using carbon-fired clays， I have become a big advocate of test strips。 A lot of work can be wasted without the information that they provide。

Test strips give clues to how completely sintered your piece is， and how good your firing schedule is。 There are so many variables to working in carbon-fired metal clay， it is often difficult to arrive at a proper firing schedule just by following the manufacturer´s suggestions。 Many times you need to customize your own firing plan。

Another use for test strips is as a "witness strip" (a term coined by Mardel Rein， owner of Cool Tools and expert on firing metal clays and troubleshooting)。 A witness strip is fired alongside your piece。 Upon removing your work after firing， you can perform tests on the strip， which will give an indication as to what is going on inside the piece you fired it with。 If it is under-fired you will be able to re-fire the piece。 This isn´t a substitute for testing to arrive at a firing schedule。 This is a technique to do after the firing schedule is already determined， anytime you would like to be informed about a particular piece or group of pieces you are firing。 Gordon Uyehara describes this use for test strips in his excellent book， Metal Clay Fusion。

So， how do we "read" a test strip?

For this article， I talked with Bill Struve， inventor of BRONZClay and COPPRClay， and owner of Metal Adventures， manufacturer of those brands。 Bill provided me with a wealth of information and also directed to me Mardel Rein´s very informative Learning Center page about firing bronze metal clay。

There are many tests you can perform on a metal clay strip。 The first one is done after removing the strip from the carbon。 Drop it onto a steel bench block。 It should make a particular type of ringing sound， very metallic。 If it has a dull sound or a "clunk"， something is wrong。

The next test is topowder metal bend the strip。 This test is designed to help determine if the piece is sintered enough to be malleable。 You bend the strip into a tight "u" shape， approximately。2 inches (5 mm) inside the "u"。 During this test， the outside surface of the strip is stretched， while the inside is compressed。 The strip should not crack， tear or break。 Thicker pieces will crack or break more easily than thin， so that is why test strips are done at a thickness of 4 or 5 cards-sort of a happy medium thickness。

The last test is to mix a tiny bit of detergent into a small amount of water， then place a drop of thispowder metal water on the strip。 The water should not be absorbed*， but sit on top of the strip。 This is because with the progression of sintering， the piece becomes less porous。 The water test indicates a "closed" porosity。

*This test will indicate a relatively full sintering。 It is possible for the strip to pass the bend test but not this test。 Not passing this test does not always indicate a problem with your piece。 But if you are looking for full sintering， this is a good test。

Another test that can be performed on a strip is to hammer it really hard。 The stripsintered metal should not crack or break。

橡膠製品-簡析密封圈類型及各類密封圈産品用途

O形密封圈用擋圈産品矽橡膠墊圈用途：本標准適用于油缸壓力大于10MPa 時配合O型圈使用。 工作溫度：-100～200℃ 　　工作介質：液壓油、乳化液、水 材質：聚四氟乙烯 根據:JB/ZQ4224-86 適配于GB1235-76

J型無骨架防塵圈

産品用途：用于往複運動油缸、氣缸中活塞杆或閥杆外露處起防塵作用。 適用範圍：TPU：工程機械、通用機械、氣缸種各類閥等。 　　CPU:工程機械油缸、工況惡劣的油氣缸。 材 質：聚氨酯 、丁腈橡膠 工作溫度：-40～120℃ 　　産品硬度：HS 80±5A 根據：JB/T6657-1993 　　※密封圈密封性能優良，工作壽命高，動態壓力密封工作壽命比常規橡膠密封制品高5—10倍，最高可達數十倍，在某些條件下可與密封基體同壽命。 　　※密封圈摩擦阻力小，動、靜摩擦力相等，是“0”形橡膠圈摩擦力的1/2—1/4，可消除低速、低壓下運動的“爬行”現象。 　　※密封圈高耐磨，密封面磨損後具有自動彈性補償功能。 　　※密封圈良好的自潤滑性能．可作無油潤滑密封。 　　※密封圈結構簡單，安裝方便。 　　※密封圈工作壓力：0一300MPa；工作速度：≤15m/s；工作溫度：-55—250O型環℃。 　　※密封圈適用介質：液壓油、氣、水、泥漿、原油、乳化液、橡膠迫緊零件水-乙二醇、酸、堿、化學藥品等。

標准密封圈標准按密封圈的截面可分爲O型密封圈，星型密封圈，X型密封圈，空心管密封圈，V型密封圈，L型密封圈，U型密封圈，Y型密封圈，異型密封圈。按材質可分爲丁腈橡膠密封圈，天然橡膠密封圈，氯丁橡膠密封圈，三元乙丙橡膠密封圈，氫化丁腈橡膠密封圈，矽膠密封圈，氟橡膠密封圈，矽氟橡膠密封圈。密封圈標准是ID內徑*CS線徑。

密封圈的裝置要求，密封防水密封圈圈是解決液壓系統泄漏問題最重要、最有效的手段。液壓系統如果密封圈不良，密封圈可能出現不允許的外泄漏，外漏的油液將會汙染環境；還可能使空氣進入吸油腔，影響液壓泵的工作性能和液壓執行元件運動的平穩性。因此，合理地選用和設計密封圈的裝置在液壓系統的設計中十分重要，對密封圈裝置的要求如下：

1。 密封圈在工作壓力和一定的溫度範圍內，應具有良好的密封性能，並隨著壓力的增加能自動橡膠製品提高密封性能。

2。 密封圈裝置和運動件之間的摩擦力要小，摩擦系數要穩定。

3。 密封圈抗腐蝕能力強，不易老化，工作壽命長，耐磨性好，磨損後在一定程度上能自動補償。

4。 結構簡單，使用、維護方便，使密封圈有更長的的壽命。

安裝注意事項1、清潔安裝位置；

2、清除密封件安裝運動過程中的毛刺；

3、在密封件上塗抹潤滑劑；

4、保護密封面不受損傷；

5、複核確認密封件的尺寸正確；

6、對于需要變形安裝的密封件使用相應工具安裝。

陶瓷軸承-直線軸承五大安裝步驟

大家應該都知道直線軸承在機械方面軸承的培林應用有很多。在各種機器配備上，直線都能發揮出最大的性能，達到自動化、省力化的最大經濟效益。直線軸承的特性有輕量化、耐蝕性、互換性、低成本等。但是有很多人都不知道在安裝直線軸承之前應該做哪些准備工作，安裝使用要注意的有哪些塑膠軸承？下面就來和大家分享一下直線軸承五大安裝步驟。

直線軸承安裝的步驟：

1、在安裝直線軸承之前必須先清除機械安裝面的毛邊、汙物及表面傷痕。直線軸承塗有防鏽油，安裝前請用清洗油類將基准面洗淨後再安裝，通常基准面清除防鏽油後易生鏽，建議用潤滑油塗抹黏度較低的主軸。

2、將用直線軸承輕輕安置在床台上，使用側向固定螺絲或其他固定治具使線軌與側向安裝面輕輕貼合。安裝使用前要確認螺絲孔是否吻合，假設底座加工孔不吻合又強行鎖緊螺栓，會大大影響組合精度與使用品質。

3、由中央向兩側按順序將直線軸承的定位螺絲旋緊，使軌道與垂直安裝面貼合，由中央位置開始向兩端迫緊可以得到較穩定的精度。垂直基准面稍旋緊後，加強側向基准面的鎖緊力，使直線軸承能夠切實貼合側向基准面。

4、使用扭力扳手依照各種材質一一鎖緊扭矩，將直線軸承滑軌的定位螺絲慢慢旋緊。

5、使用相陶瓷軸承同安裝方式安裝副軌，且個別安裝滑座至主堆高機軌與副軌上。注意滑座安裝上線性滑軌後，後續許多附屬件由于安裝空間有限無法安裝，必須于此階段將所須附件一並安裝。

輕輕安置移動平台到直線軸承主軌與副軌的滑座上，然後鎖緊移動平台上的側向迫緊螺絲，安裝定位後即可完成。

半自動電焊機-智能超聲波焊接機操作方法

本機PLC和人機界面集合爲一體大電焊機大節省了空間，防止了高頻幹擾，采用DC24V電源供電更安全，整機性能穩定，大大提高了使用壽命和焊接精度重力底座可防止焊接時的後仰。長翔超聲波新型智慧機采用新式Z型導軌，移動更快捷，操作更簡便，焊接更精密。

智能超聲波焊接機：焊接範圍例如：汽車水壺、汽車備用水箱、汽車玻璃水水箱、汽氬焊機車噴水壺、汽車膨脹水箱、電瓶外殼CO2焊機、電池塑料殼、汽車大燈、濾芯端蓋、汽車車門、汽車汽車儀表、車燈車鏡、遮陽板、內飾件、濾清器，保險杠、拉索、摩托車用塑料濾清焊接護具器、散點焊機熱器、制動液罐、油杯、水箱、油箱、風管、半自動電焊機尾氣淨化器、托盤濾板等。

智能超聲波焊接機：優點，特點：

1、可熔接除鐵氟龍以外的熱可塑性塑電離子焊接機膠；
2、熔接時間極爲短暫，通常範圍（0。05-1秒）；
3、超聲波熔接不會産生如化學藥劑之毒性，爲一安全的TIG焊機熔接加工；
4、無須添加任何粘劑，操作簡更快捷。
5、可經由介質如水，油等熔接于接合面。
6、熔接效果，可達引擎電焊機氣密、液密等密封效果；
7、可作直接與傳導熔接；
8、熔接能量因塑膠材質而異，而且並非超聲波振動全部材質，只選擇適合發生的振動面生熟，所以産品表面無傷痕之顧慮，此爲傳道熔接之特色。在較硬的塑膠質熔接時，更能發揮其熔接效果；

清除宿便-6個減肥方法 讓你瘦身成功無壓力

瘦身減肥對于很多人來說都纖維減重是一件困減肥餐難的事情，下面就要交給大家幾個瘦身方法，幫助大減肥代餐家毫無壓力輕輕松松就能達到瘦身減肥的目的，那麽就來看看我們應該怎麽做吧。

一，帶著激情和動力去減肥，它就絕對不是一件困難的事情。我們都希望擁有美妙的身材，所以爲了這個目標，就要努力的去控制飲食奇亞籽減肥和堅持運動，要懂得約束自己，在出現懈怠和消極的情緒時要用自己的減肥瘦身方法去調整，當然如果有家人和朋友的督促會更好。

二，我們一日三餐所吃的食物時最重要的，除了要控制它們的熱量並且關注營養價值之外排便順暢，選擇纖維含量比較高、比較易于消化和吸收的食物對減肥也是非常有利的。千萬不可以盲目的節食，保證體內的營養充足也是維持新陳代謝的基本條件。

去水腫 三，減肥當然不能缺水，經常喝水可以促進身體的血液循環，讓毒素更好的排出體外，降低脂肪的堆積。而且喝水還能爲我們帶來飽腹感，控制食欲。清晨喝一杯蜂蜜水清除宿便或者是淡鹽水，可以刺激腸胃蠕動，避免便秘的問題。

四，水腫也是引發肥胖的一個原因，而且身材看是去也特別的臃腫。造成水腫的原因有很多，例如經常吃口味比較重的食物、缺乏運動或者是新陳代謝下降，都會出現這樣的問題。所以飲食盡量清淡，避免久坐，運動排汗等等都可以有效的去除水腫。

五，想要讓自己的身材變得更加健康緊致，運動是必不可少的。把運動融入到自己的生活中，無論是去健身房鍛煉，還是在家做一些簡單的小運動，甚至只是簡單的散步，都能幫助我們消耗脂肪，並且提高身體的代謝水平，促進減肥的效果並且預防肥胖。

六，良好的生活習慣是預防肥胖最好的辦法。這其中睡眠更是非常的重要。當我們進入睡眠狀態時，身體的代謝還在進行，這也是脂肪燃燒的一個過程，如果不能得到充分的休息，那麽代謝的效率也會有所降低，而且還會讓人感覺十分的疲累。