What does "Waterproof to JIS4 standards" mean? What is the standard and where is it published?

Question

I have a radio that is listed as waterproof/water resistant. But, how waterproof is it?

I asked this question to the manufacturer of the marine radio, and they sent me a link to WikiPedia - http://en.wikipedia.org/wiki/Japanese_Industrial_Standard - This is not really the definitive source I need, and it does not specifically list JIS4. I also did not find JIS4 listed on the Japanese Industrial Standards website.

Thanks in advance for your help!

Answer 1

The JIS4 Standard is not really a Water-Proof standard, but rather water-resistant. JIS4 in a nutshell means the product must be able to work without damage after submersion in water up to 1 metre for 30 minutes. In other words, it is for products where expected use around water is not under high-pressure, but it could get wet and still be ok. Typical for products with intended use around pools, marine craft, or weather/rain use. Not intended for taking diving for example.

Answer 2

Jis4 Waterproof

Answer 3

First answer about as good as any. It just a number to make it sound good.
I not sure how this link will work, it a .pdf file for a uniden and say a little;
http://www.prestigecom.net.au/catimages/UH075.pdf

Here what it say if the link not work;
WATERPROOF: JIS4
Uniden's UH075 radio is designed to meet the water proofing standard of JIS4.
This Means:
"...the unit is able to withstand a steady stream of water from a hose for 5
minutes without leakage..."
The UH075 will only meet this rating if fully assembled and all rubber seals
and bungs are well maintained and correctly fitted. This means that the
speaker microphone bung is inserted, and the battery pack and antenna
are attached and securely fastened.
This is NOT a rating that allows for the unit to be submersed.