Solutions containing 20% to 50% HF may cause delayed symptoms which become manifest in one (1) to eight (8) hours. Solutions with less than 20% HF may not cause symptoms for up to 24 hours.

• 含有20%25到50%25的hf的溶液会导致延迟的症状，这些症状在1到8小时之内变得明显。含有小于20%25的hf的溶液不会在24小时内导致出现症状。