Why do condoms break?
see this here Not all the condom in the market come in good quality, some brand owner want to compete with others condom brand by very cheap price, but cheap price must means bad quality, which is easy break.
http://bigreddot.co.uk/author/alex/ Have you ever had a condom break on you? It is terrifying. The good news is that it is avoidable in the future, as long as you learned why it happened. Condoms are tested in many ways for safety, durability and reliability by the FDA or MOH, but improper use also can compromise an otherwise reliable condom. Any one (or more than one) of these common user errors can cause a condom to break, rip, burst or tear breakthrough.
the condom is expired or had been stored in extreme temperatures;
the condom is too snug and is stretched beyond its limit;
the condom is material became dry and hot because not enough additional lubricant was added;
additional lubricant was added, but it was oil-based;
the condom wrapper was opened with teeth, scissors, or a knife, creating a rip in the condom itself.
It’s easy burst when above items happens, so please take attention to the above items before use or choose the condoms.