I am talking about bond fund in general...
Let's say a company issued bond at par value of US$1000, with coupon rate of 5%. That means every year, it pays interest of $50/unit.
With Fed rate hike, the market value of the bond may drop. Let's say before that it was traded at $1000. Now the market price has dropped to $980. The issuer will still pay interest at $50, not $49.
And, as maturity date draws close, the market price will move towards its par value, which is $1000.
All these, provided that there is no DEFAULT.
Rate hike does increase the possibility of default. However, from what I know, bond default rate is low, even among junk bonds.
OK, will all those said, you make your own judgment

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My suggestion is your forego the RHB Islamic Bond Fund, but you can still invest in other bond funds.
why forego RHB Islamic BF ? it has been doing extremely well and consistently for past 5 years