Currently reading a paper about silicone rubber/filler material composite. The paper says the PHR of the prepared composite is 5. Later, the paper explains that composite having the PHR value of 5 is also having the value of 5wt% filler material. Is it possible for PHR and wt% to have a same numerical value in a single composite like this?
Sometimes PHR means “parts per hundred resin”. Since per cent also means “per hundred” those would be expected for be the same. They may use one term in the preparation and the other for finished composite.
PHR is parts per hundred RESIN. If you add 5% of component B in 100 parts of resin you will get 105 parts of mixture. So 5% of 105 is 5,25. So, mathemacally it is different. But the difference is not so high and some people simply use as the same value when the PHR is low. As lower is the phr as lower is the difference in PHR and percent.
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