【经验】什么是橡胶屏蔽O形密封圈压缩量？如何设计以实现更佳效果？
橡胶屏蔽O形密封圈，简称O形圈，是应用极为广泛的一种密封垫圈产品。很多电子产品设计工程师都会遇到在结构中设计适合的O形圈任务，如何设计理想的O形密封圈，这并不是一个简单的任务，需要考量的点有很多，包括导电橡胶材料、屏蔽效能、材料硬度、压缩应力、压缩量等等。本文讨论的就是关于O形圈在密封结构中的压缩量，这是设计过程中必须考虑的关键属性之一。
图1 各种橡胶屏蔽O形密封圈
先说一下，什么是压缩量？压缩量，也可称为压缩率、变形率，是指弹性密封垫圈在安装后产生的变形量比率，数值表现为自由状态下的垫圈横截面厚度的百分比。这种弹性压缩变形量能够产生相应的压缩应力，能够与配合法兰保持紧密接触状态，以阻碍各种流体和粉尘的通过，达到环境密封的效果。理论上，压缩量越大，产生的压缩应力也就越大，密封效果会更好。但这也需要有一个度，或者说有一个最大压缩量的设定值，为了确定最大压缩量，需要考虑的因素有很多。
首先，要考虑的是密封性和配套法兰的应力承受能力。这是要综合在一起考虑的两个因素，前面说过压缩量越大，应力就越大，密封效果也会更好，但是这要同时考虑配合法兰材料的硬度和强度。要以不损坏法兰结构为前提，来考虑最大压缩量的设计。
其次，如果是动态应用，那就要考虑到压缩应力带来的摩擦力影响。过高的摩擦力会造成密封结构的快速磨损，也有可能影响电子设备的正常使用。例如，手动调节的精密医疗设备中，产生过大摩擦力的O形圈，可能会影响医生对于设备的掌控感觉。
第三，O形圈挤压损伤，压缩量越大的应用中，产生挤压损伤的风险就越大，这是极有可能造成密封失效的一种潜在风险。派克固美丽根据大量的实验和使用数据分析，得出的结论是，压缩量超过40%的应用中，挤压损伤几乎不可避免；而在25%压缩量以下的应用中，几乎不存在挤压损伤的现象。由此，派克固美丽公司对于其生产的塑模O形圈产品的压缩量推荐值为10%~25%，既可以保证有一定的封闭应力，又不容易产生挤压损伤的现象。
第四，永久变形量，当O形圈完成安装，实现密封效果后，其弹性势能会随着时间缓慢衰减，当弹性势能完全消失时，O圈将会永远保持一定的压缩状态，这就是永久变形量，数值用百分比表示。理论上永久变形量达到80%时，大部分O形圈都将失去密封能力，而且这种变形现象是不可逆且不可阻挡的。也就是说，无论什么样的橡胶材料，经过长时间压缩后，都会产生永久变形的失效现象，区别在于失效前经历的时间过程有多长，换句话说就是橡胶O圈的有效寿命有多长。这个寿命很难用一个时间长度进行定义，因为影响的因素太多，但是我们可以通过橡胶材料的一个参数进行侧面的关联判断，那就是相同条件下的永久变形量。派克固美丽对导电橡胶材料CHO-SEAL系列的测试标准为，100℃环境下70小时（25%压缩量），所有型号的永久压缩量都在25%~60%之间，从材料角度可以保证较长时间的有效寿命。当然，如果有使用寿命上的特殊要求，可以尽量选择永久压缩量数据小的几款材料，例如CHO-SEAL 6330（镀镍石墨硅橡胶）和CHO-SEAL L6303（镀镍石墨氟硅橡胶），这两款的永久压缩量测试值都只有25%，理论上是使用寿命最长的两款导电橡胶。
最后总结一下，综合的考虑上述各项因素，是设计橡胶O形密封圈压缩量的关键。正确的设计，能够保证在最长的使用寿命周期内，获得最佳的O形圈密封效果，对于O形圈以及配套法兰的损伤也会更小。
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新产品 发布时间 : 2019-04-09
Product Environmental Quality Certification
型号- CHO-SHIELD 571,THERM-A-GAP 569PT,CHO-SEAL 1285,SOFT-SHIELD 3500,SOFT-SHIELD 5000,CHO-SEAL 1401-S,CHO-SEAL V6433,CHO-SEAL 0862,THERMFLOW T725,CEL-XX-5103-XXXX,CHO-SEAL 1278,CHO-SEAL 0860,THERM-A-GAP T652,CHO-SEAL 1291,CHO-SEAL 1290,CHO-FORM 5575,CHO-THERM 1641,CHO-THERM 1646,THERM-A-GAP GEL 40,THERM-A-GAP T654,THERMATTACH T491,CHO-BOND 320,CHO-SEAL 1287,THERM-A-GAP 579KT,CHO-FORM 5560,CHO-SHIELD 596,CHO-MUTE 9000,THERM-A-GAP PAD70TP,SOFT-SHIELD 4850,FPCV-14244,THERM-A-GAP PAD30PN,CHO-FOILCCD,FPCV-13701,THERM-A-GAP F174,CHO-SHIELD 4076,THERMFLOW PC07DM-7,THERM-A-GAP GEL 40NS,CHO-SEAL 1298,CHO-SEAL 6503,CHO-SEAL 6502,CHO-MASK II CMT,CHO-THERM T609,THERM-A-GAP T630,CHO-FORM 5550,THERM-A-GAP T636,CHO-SEAL S6304,THERM-A-GAP G580,THERM-A-GAP T635,CHO-SEAL S6305,CHO-THERM T290,THERM-A-FORM 1641,THERM-A-FORM 1642,THERM-A-GAP G574,CHO-BOND 584,THERM-A-GAP 569PB,THERM-A-GAP G579,CHO-SEAL 1501,THERM-A-GAP PAD30G,THERMFLOW T710,THERM-A-GAP PAD30A,THERMAL GREASE T660,CHO-MUTE 9025,CHO-MUTE 9020,CHO-FORM 5541,CHO-FORM 5542,CHO-SEAL 6372,CHO-SEAL 6371,CHO-SEAL 6370,CHO-LUBE E117,THERM-A-GAP A580,SOFT-SHIELD 1000,THERM-A-GAP G570,THERM-A-GAP PAD60,CHO-FAB CFT,CHO-SEAL 1358,CHO-SEAL 1236,CHO-SEAL 1239,CHO-SEAL L6303,CHO-THERM T500,CHO-SEAL 1250,THERMAL GREASE T650,CHO-FOIL CCD,CHO-FOIL CCE,THERM-A-GAP T174,THERM-A-GAP A574,CHO-FOIL CCH,CHO-FOIL CCJ,CHO-FOIL CCK,THERM-A-GAP A570,THERM-A-GAP A515 RFA,CHO-FORM 5538,THERM-A-PAD-579PN,CHO-MUTE 9005,CHO-SHIELD 1091,THERM-A-GAP PAD60A,THERM-A-GAP A569,CHO-SEAL 1260,CHO-FORM 5526,CHO-FORM 5528,THERM-A-GAP GEL 8010,CHO-BOND 1099,CHO-FORM 5519,THERM-A-GAP 6579,THERM-A-GAP F574,THERM-A-GAP TPS60,THERM-A-GAP 579PN,FPCV-14832,THERM-A-GAP GEL 8017,CHO-BOND 1091,CHO-SIL 1485,CHO-JAC CJ-022-26,THERM-A-GAP 579PB,THERM-A-GAP 579,CHO-SEAL 1273,THERM-A-GAP PAD30,THERMAL GREASE T670,CHO-SIL 1356,CHO-FOIL CAD,THERM-A-GAP T274,CHO-SEAL 1270,CHO-FORM 5513,SOFT-SHIELD 2000,THERM-A-GAP 579PT,CHO-FORM 5515,CHO-SORB,THERM-A-GAP 6569,CHO-BOND 1088,TECKNIT 72-0008,THERM-A-GAP G174,CHO-LUBE4220,CHO-BOND 584-29,CHO-BOND 1083,CHO-SEAL 1265,THERM-A-GAP PAD80,CHO-BOND 1085,CHO-BOND 1086,THERMATTACH T405,CHO-SEAL 6452,CHO-SEAL 6330,THERMATTACH T404,CHO-SHRINK TUBES,CHO-LUBE 4220,CHO-BOND 360-208,CHO-SEAL 2561Y,CHO-FAB CRS,CHO-FORM 5506,THERM-A-GAP GEL 45,CHO-BOND 1076,CHO-BOND 2165,FPCV-13444,CHO-BOND 1077,CHO-SHIELD 608,THERM-A-GAP GELAB,CHO-BOND 1072,CHO-SEAL 1310,CHO-BOND 1073,CHO-SHIELD 604,CHO-BOND 1075,THERMATTACH T418,THERMATTACH T412,THERMATTACH T413,THERMATTACH T414,CHO-SEAL 6460,THERM-A-GAP 575NS,CHO-SEAL S6600,THERM-A-GAP G515 RFA,CHO-STRAP,CHO-BOND 1067,CHO-BOND 1069,THERM-A-GAP PAD70TPF,THERM-A-GAP TC60,THERMATTACH T410,THERMATTACH T411,THERMATTACH T428,CHO-SHIELD 2056,CHO-SHIELD 4916,CHO-SHIELD 4914,CHO-BOND 1055,CHO-BOND 1056,CHO-THERM T444,CHO-THERM T441,THERM-A-GAP TC50,THERM-A-FORM CIP35,CHO-SEAL 1215,CHO-SHIELD 2052,CHO-SEAL 1217,CHO-BOND 1053,CHO-SEAL 1212,CHO-SEAL 1350,THERM-A-FORM T644,THERM-A-FORM T646,THERM-A-GAP GEL 30,CHO-SHIELD 2044,THERM-A-FORM T647,CHO-SHIELD 4900,CHO-SHRINK BOOT,THERMFLOW T310,THERM-A-GAP G974,CHO-SHIELD 2040,CHO-SHIELD 610,CHO-SEAL 2557,THERMFLOW T557,CHO-SEAL 1221,CHO-SEAL 1224,THERM-A-FORM T642,THERMFLOW T558,CHO-BOND 360-20,SOFT-SHIELD 3700,CHO-SEAL 2542,THERM-A-FORM T644G,THERM-A-GAP T580,CHO-BOND 1029,THERM-A-GAP GEL20,THERM-A-GAP T630G,CHO-BOND 1035,CHO-BOND 1038,CHO-BOND 4669,CHO-BOND 592,THERMFLOW T766,CHO-BOND 1030,CHO-BOND 4660,THERM-A-GAP GEL 4517,THERM-A-GAP T574,CHO-JAC,CHO-THERM 1680,THERM-A-GAP T570,SOFT-SHIELD 4008,SOFT-SHIELD 4800,CHO-BOND 1018,CHO-BOND 1019,CHO-THERM 1684,THERM-A-GAP A174,SOFT-SHIELD 4004,SOFT-SHIELD 4002,THERM-A-GAP T579,SOFT-SHIELD 4000,SOFT-SHIELD I,TECKNIT 72-08116,CHO-BOND 1024,CHO-BOND 1027,CHO-SEAL 1401,THERM-A-GAP A579,THERMFLOW T777,THERM-A-GAP TPS60G,CHO-SEAL 6313,TECKNIT 0005,CHO-THERM 1671,TECKNIT 0002,CHO-SIL 1401,THERM-A-GAP GEL60HF,CH0-SEAL 0860,CHO-THERM 1674,CHO-THERM 1679,THERM-A-GAP T569,CHO-THERM 1677,THERM-A-GAP G274,CHO-THERM 1678,CHO-BOND 1016,THERM-A-GAP GEL37,CHO-SEAL 6308,THERM-A-GAP 976,THERM-A-GAP PAD30KT,CHO-SEAL 6307,CHO-SEAL 1651,CHO-SHIELD 2002,THERM-A-GAP GEL 75,CHO-SHIELD 2003,THERM-A-GAP 974,CHO-SHIELD 2001,CHO-THERM 1661,THERM-A-GAP A274,THERM-A--FORM CIP35,CHO-BOND 1121,THERM-A-GAP HCS,CHO-SEAL1285,CHO-SEAL 6435
【产品】圆形连接器专用橡胶屏蔽矩形圈，全面适用于国际国内标准
符合美军标的圆形连接器应用，是一种标准的应用需求，Parker Chomerics公司生产了一系列的标准型橡胶屏蔽矩形圈产品，以应对大量的此类应用需求。矩形圈相对于O形圈，其安装稳定性好，密封压力也更高，并且不会出现“回吸效应”，同尺寸的矩形圈在屏蔽效果和密封效果上都要好于O形圈。而且该公司生产的矩形圈系列产品，已经达到了与O形圈相同的精度水准，工艺成本更低，成本效益更高。
新产品 发布时间 : 2019-04-28
EU REACH ARTICLE SVHC DECLARATION OSHA ARTICLE SAFETY DATA SHEET
型号- CHO-BOND 1024,THERM-A-GAP T274,CHO-BOND 1027,CHO-MUTE 9020,THERMFLOW T766,CHO-MUTE 9025,CIP 210,CHO-BOND 1019,SOFT-SHIELD 2000,CEL-XX-5103-XXXX,THERM-A-GAP 976,THERM-A-GAP 974,THERM-A-GAP A569,CON-SIL A,THERMFLOW T777,THERM-A-GAP F574,CHO-SHIELD 596,CHO-THERM T500,CHO-BOND 360,THERM-A-GAP HCS,THERM-A-GAP A579,THERM-A-GAP A574,THERM-A-GAP T174,THERM-A-GAP A570,PREMIER AB140FR,FPCV-14244,FPCV-13701,CHO-BOND 592,THERM-A-GAP 579PT,CHO-BOND 1035,THERM-A-GAP TPS60,CHO-SEAL V6433,CHO-SEAL 1290,THERM-A-GAP 579PB,CHO-BOND 1030,THERM-A-GAP G570,THERM-A-GAP A580,THERM-A-GAP T579,CL-130,THERM-A-GAP G569,CHO-BOND 584,SOFT-SHIELD 1000,CHO-BOND 1029,72-08116,THERM-A-GAP T630,CHO-BOND 1067,CHO-BOND 1069,CHO-THERM 1661,CHO-SEAL L6303,THERM-A-GAP T636,THERM-A-GAP T635,THERM-A-GAP G580,THERMATTACH T491,CHO-SEAL 1285,CONSIL NC,CHO-SEAL 0860,THERM-A-GAP G574,CHO-SEAL 0862,THERM-A-GAP G579,THERM-A-FORM 1642,THERM-A-FORM 1641,THERM-A FORM T644,CIP 250,THERM-A-GAP GEL30,CHO-THERM 1679,CHO-BOND 1056,THERMAL GREASE T650,CHO-BOND 1055,CHO-THERM 1677,CHO-THERM 1678,CHO-THERM 1674,CHO-THERM 1671,CHO-BOND 1053,THERM-A-GAP 569PT,CHO-FAB CFT,CHO-LUBE 4220,CHO-FORM 5513,SOFT-SHIELD 4850,CHO-FORM 6600,CHO-FORM 5515,THERM-A-GAP T652,CHO-THERM T290,THERM-A-GAP 569PB,CHO-THERM 1684,THERM-A-GAP TPS60G,CHO-MUTE 9000,CHO-THERM 1680,CHO-SHIELD 610,CHO-BOND 1086,CHO-THERM T609,THERM-A-GAP T654,CIP 110,CHO-SHIELD 4076,THERM-A-GAP T630G,CJ-022-26,CHO-SHIELD 608,THERMFLOW T310,PREMIER APEI-140,CHO-BOND 1076,CHO-BOND 2165,THERMAL GREASE T670,SOFT-SHIELD 5000,CHO-SHIELD 604,THERMFLOW T557,CHO-BOND 1073,CHO-BOND 1072,THERMFLOW T558,PREMIER A240-FRHF,CHO-MUTE 9005,THERM-A-GAP 579KT,CHO-SEAL S6600,SOFT-SHIELD 3500,CHO-SEAL 6370,THERM-A-GAP A274,CHO-SEAL 6372,THERM-A-GAP F174,FPCV-13444,CHO-SEAL 1356,CHO-SEAL 1236,CHO-FORM 5541,THERM-A-GAP 579,CHO-SHIELD 2002,CHO-FAB CRS,CHO-BOND 1091,THERM-A-GAP TS15,THERM-A-GAP T569,THERM-A-GAP G274,CHO-SEAL 1221,PRIMER 1083,CHO-FORM 5550,PRIMER 1088,PRIMER 1085,CHO-THERM 1646,CHO BOND 4660,CHO-FORM 5506 FIP-C,CHO-FORM 5519,THERM-A-GAP T574,THERM-A-GAP GEL45,THERM-A-GAP T570,XTS8010,THERM-A-GAP A174,THERM-A-GAP T579,TC60,CHO-SEAL 1212,SOFT-SHIELD 4008,SOFT-SHIELD 4800,THERMFLOW PC07DM-7,CHO-SEAL 1217,SOFT-SHIELD 4002,SABIC C6200,SOFT-SHIELD 4000,CHO-FORM 5528,CHO-FORM 5526,SOFT-SHIELD 4004,THERM-A-FORM CIP35,THERM-A-GAP T580,THERM-A-GAP G515 RFA,CHO-SEAL 6460,TC50,THERM-A-GAP G174,PREMIER A220,SOFT-SHIELD 3700,PREMIER A225,R4013-24-C,THERMATTACH T410,THERMATTACH T411,CHO-SEAL 6452,THERM-A-FORM T646,CHO-SEAL 6330,THERMFLOW T725,XTS8030,CHO-MASK II CMT,THERM-A-FORM T647,PREMIER A230,THERM-A-FORM T642,PREMIER A235,CHO-BOND 4669,THERM-A-GAP G974,THERMATTACH T414,THERM-A-GAP 575NS,THERMATTACH T412,THERMATTACH T413,THERMATTACH T418,THERM-A-FORM T644G,CHO-FOIL CCK,CHO-FOIL CCJ,CHO-JAC,PARPHORM 1945,THERM-A-GAP GELAB,CHO-SHIELD 2044,CHO-FOIL CCD,CHO-SHIELD 4900,CHO-FOIL CCH,CHO-FOIL CCE,CHO-SEAL 6435,PREMIER A240,CIP 300,THERMATTACH T404,CHO-SEAL S6304,THERMATTACH T405,CHO-BOND 1121,TW10,CHO-SHIELD 2056,CHO-SHIELD 4914,CHO-SHIELD 4916,CHO-SEAL 6313,CHO-FORM 5560,CHO-SEAL 6307,PRIMER 1099,CHO-SHIELD 2052,THERM-A-GAP A515 RFA,PARPHORM 1800,THERMFLOW T710,CHO-FOIL CAD,CHO-SHIELD 571,PREMIER A240EC,TPS60G,CHO-SEAL 1401,CHO-THERM T441,CHO-THERM T444,THERMATTACH T428,CHO-SHIELD 1091
【产品】适用于O形圈安装和OEM应用的小型温度补偿压力传感器86系列
TE Connectivity推出86补偿系列是一种小型，介质兼容，压阻式硅压力传感器，采用316L不锈钢外壳封装。 其设计用于O形圈安装和OEM应用，需要与腐蚀性介质兼容。
新产品 发布时间 : 2019-01-23
【产品】Parker Chomerics多尺寸矩形橡胶屏蔽密封圈，安装稳定性好、密封压力高
Parker Chomerics公司生产的矩形橡胶屏蔽密封圈，采用CHO-SEAL®系列导电橡胶为原材料，能够提供各种不同电气性能和机械强度的垫圈产品，以满足全面的市场应用需求。矩形圈的优点在于安装稳定性好、密封压力高，不会出现O形圈常见的“回吸效应”，从密封性能的角度看，更加推荐矩形圈。矩形圈采用的是挤出成型后切片的生产工艺，成本更低，是一种高性能、高成本效益的解决方案。
新产品 发布时间 : 2019-04-17
【产品】美国军用标准防松螺母专用导电O形圈，采用CHO-SEAL®系列导电橡胶材料
O形圈由于结构通用性好，工艺精度高，一直都是密封圈类产品中最常见的类型之一。在既需要水汽密封，又需要电磁密封的应用环境中，就需要用到以导电橡胶为原料制成的导电O形圈产品。Parker Chomerics根据国际上比较流行的三款美国军用标准MIL-C-38999，MIL-C-26482和MIL-C-81511，生产了一系列标准的防松螺母专用导电O形圈产品。
新产品 发布时间 : 2019-04-25
电子商城
现货市场
服务
使用FloTHERM和Smart CFD软件，提供前期热仿真模拟、结构设计调整建议、中期样品测试和后期生产供应的一站式服务，热仿真技术团队专业指导。
实验室地址： 深圳 提交需求>
模切导热屏蔽/麦拉/泡棉/背胶/毛毡类材料产品精度：±0.05mm;冲床最大尺寸：550mm*1300mm；模切最大尺寸：380*420mm。
最小起订量： 1 提交需求>
授权代理品牌：集成电路
授权代理品牌：分立元件
授权代理品牌：接插件及结构件
授权代理品牌：部件、组件及配件
授权代理品牌：电源及模块
授权代理品牌：电子材料
授权代理品牌：仪器仪表及测试配组件
授权代理品牌：电工工具及材料
授权代理品牌：机械电子元件
授权代理品牌：加工与定制
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