危险磁铁（部件）问题

oahemr · 发表于 2011-10-26 22:27:49

4.38 Magnets—This requirement is intended to address ingestion hazards associated with toys intended for children up to 14 years of age that contain a hazardous magnet. This requirement does not apply to magnets used in motors, relays, speakers, electrical components, and similar devices where the magnetic properties are not part of the play pattern of the toy.

4.38.1 Toys must not contain a loose as-received hazardous magnet or a loose as–received hazardous magnetic component.

4.38.2 Toys shall not liberate a hazardous magnet or a hazardous magnetic component after being tested in accordance with 8.8 and 8.9 and magnet use and abuse testing as specified in 8.24.

4.38.3 Hobby, craft, and science kit-type items intended for children over 8 years of age, where the finished product is primarily of play value, that contain a loose as-receivedhazardous magnet or a loose as-received hazardous magnetic component, or both, are exempt from the requirements of 4.38.1 and 4.38.2 provided they comply with the requirements for safety labeling described in 5.17.

以上是ASTM F963-2008原文
问题如下：
1、马达、中继器、扩音器、电子元件等不适用于4.38，是否该类磁铁完全不需进行4.38测试？测试报告是否不应有4.38？
2、滥用测试怎样进行？先跌落、扭、拉、压；之后扭、拉；最后再根据8.24？我看到8.24滥用需要用新样板，那么是否上面的8.8、8.9重复了？

ejfgde · 发表于 2011-10-26 22:28:43

含有磁鐵的部件對于含有功能的部件首先要做壽命測試再做沖擊----扭/拉力！最后評估如有被拉出的部件是否為小物件

magebao · 发表于 2011-10-26 22:28:53

如果不适用的话，好像都写上“NA”

oahemr · 发表于 2011-10-26 22:29:29

请问寿命测试是？

magebao · 发表于 2011-10-26 22:30:02

就是吸合——分离的循环测试
首先把磁铁分开一段刚刚可以感觉到磁力的距离，然后释放，当磁铁部件吸合到一起时，再将其分开。一分一合为一个循环，美国的要求是1000次

oahemr · 发表于 2011-10-26 22:30:27

谢谢

新增个问题，那个50是通过单极KG×单极面积的，请问象那种多极磁铁也该这样算吗？怎样把那个单极面积找出来？

622 · 发表于 2011-10-26 22:30:41

这种磁胶（多极磁铁）也是标准的范围。（仔细看看就知道了，对此的方法也说得很清楚）

用那种带磁粉的胶片盖在磁胶上，就会看到被分成了很多磁条，找出面积最大的就可以了。（两条白线之间面积最大的）

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