EN71 磁铁测试

peterxu · 发表于 2009-12-30 15:06

EN 71磁铁测试的要求是不是磁通量不能超过50平方千高斯平方毫米,或者不能是小部件,两个条件必须同时不满足还是只要有一个条件不满足就可以FAIL了呢 ?谢谢
4.23 Magnets (see A.51)
4.23.1 General
The requirements in 4.23.2 do not apply to functional magnets in electrical or electronic components of toys.
The requirement in 4.23.3 does not apply to magnetic/electrical experimental sets in which all magnets have a
magnetic flux index less than 50 kG2mm2 (0,5 T2mm2) when tested according to 8.35 (magnetic flux index), or
do not fit entirely in the cylinder when tested according to 8.2 (small parts cylinder).
4.23.2 Toys other than magnetic/electrical experimental sets
a) Any loose as-received magnet(s) and magnetic component(s) shall either have a magnetic flux index
less than 50 kG2mm2 (0,5 T2mm2) when tested according to 8.35 (magnetic flux index), or shall not fit
entirely in the cylinder when tested according to 8.2 (small parts cylinder).
b) Any magnet(s) and magnetic component(s) that become(s) released from a toy, or from a loose asreceived
magnetic component, when tested according to 8.3 (torque test), 8.4.2.1 (tension test,
general), 8.4.2.2 (tension test, seams and materials), 8.5 (drop test), 8.7 (impact test), 8.8
(compression test), and finally, for magnets that are accessible but not grippable (as specified in
8.4.2.1), 8.34 (tension test for magnets), shall either have a magnetic flux index less than 50 kG2mm2
(0,5 T2mm2) when tested according to 8.35 (magnetic flux index), or shall not fit entirely in the cylinder
when tested according to 8.2 (small parts cylinder).
NOTE An example of a magnet that is accessible but not grippable could be a magnet that is recessed.
c) Wooden toys, toys intended to be used in water, and mouth-actuated toys shall be tested according to
8.9 (soaking test) before being tested according to 4.23.2 b) above.
4.23.3 Magnetic/electrical experimental sets
Magnetic/electrical experimental sets intended for children over 8 years shall carry a warning (see 7.20).

peterxu · 发表于 2009-12-30 15:20

ASTM F963和EN71就是有这些细微的差别....呵呵~~~

hewei · 发表于 2009-12-30 15:32

要同时满足
磁通量超过50,但不是小物件没危险性
是小物件,但磁通量不超过50,只有小物件危险,而没有磁铁的危险
针对磁铁的危险就必须同时满足,

peterxu · 发表于 2009-12-30 15:33

但EN71里用的词是OR而不是AND呀.....谢谢HEWEI

yanfenghmm · 发表于 2009-12-30 15:37

不是太了解这方面的东西，还请高手指点啊

jackypang · 发表于 2009-12-30 15:42

我覺得應該這樣理解：
首先磁鐵本身不能為小物件或小物件組成部件; 如果是小物件或小物件組成部件，則磁鐵的磁通量應該小於50平方千高斯平方毫米。可能簡單地說，如果磁鐵的磁通量大於50但不是小物件的話會有危險。而如果大於50又是小物件的話就會更加危險。

下面借用ASTM F963的定義參考一下：
ASTM F963 definitions: 3.1.33 hazardous magnet—a magnet which has a flux index >50
3.1.34 hazardous magnet component—any part of a toy that is a small object (refer to 4.6 and Fig. 3) and which contains an attached or imbedded magnet which has a flux density >50 as determined in accordance with the test method in 8.24.1.
EN71

peterxu · 发表于 2009-12-30 15:47

其实我的看法是和大家一样的...就是现在标准上EN71用的是or,ASTM用的是and,歧义就这样产生了..所以我想了解下大家在平时做测试时是按照什么来判PASS或者FAIL的呢?谢谢!
我的想法是严格按照标准来做,免得别人来和你钻字眼...大家认为呢??

peterxu · 发表于 2009-12-30 16:54

大家有没有想过有些磁铁磁通量很大,吸力很大,但是不是小部件,在玩耍过程中互相吸引到一起打到手指而造成伤害呢??那应该是PASS还是FAIL呢??

jackypang · 发表于 2009-12-30 17:29

這也許是一個新的研究問題，到時標准可能又要修改了。有可能是二種趨勢：
1. 所有標准加大小物件測試筒的尺寸。
2. 再修改磁鐵玩具的要求。

至少你現在上面所說的按標准說是PASS，但建議改善。

peterxu · 发表于 2009-12-30 17:46

现在主要的问题是ASTM F963-08的危险磁铁的定义是必须是小部件,而EN71里却用了OR这个词,所以我有点迷糊了,现在磁通量是超过了50,但不是小部件....按照EN71的"OR"来说的话不就是说只要超过50或者是小部件就会FAIL,而不是既超过50又是小部件才会FAIL......

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[玩具标准] EN71 磁铁测试

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