EN 71 cov khoom ua si Soj Ntsuam Cov Khoom Kua to Xeem Koob

Khoom cov kev taw qhia ntawm cov  kua to Xeem Koob

Siv mus ntsuam xyuas lub leakiness ntawm cov kua sau cov khoom ua si.

Khoom tsis muaj lub kua to Xeem Koob

Khoom Feature thiab daim ntawv thov ntawm cov kua to Xeem Koob

siv

1. Muab cov khoom ua si nyob rau hauv lub cheeb tsam ntawm (37 ± 1) ° C rau tsawg kawg 4 teev;

2. Thov 5 + 0.50N quab yuam kom tej feem ntawm cov txheej nto ntawm lub qho khoom ua si nrog ib tug hlau koob tom qab tshem tawm cov khoom ua si los ntawm cov pretreatment ib puag ncig;

3. Maj mam ua kom tus quab yuam tsis pub dhau 5 thiab kom nws rau 5s;

4. Txiav Txim tshwm sim: Tom qab kawm tiav, check seb tus qho khoom ua si txia (muab cobalt chloride daim ntawv nyob rau qhov chaw nyob qhov twg lub dag zog yuam yog thov);

5. Rov qab kuaj nyob rau hauv cov khoom ua si ntawm (5 ± 1) ° C rau tsawg kawg 4H. (Faj seeb: Tom qab 5 ° C xeem, koj muaj peev xwm siv tsis tau cobalt chloride ntawv vim hais tias nws yog txias.

Hws yuav ua tau kom erroneous tau. )

Khoom Paub meej ntawm lub kua to Xeem Koob

Xeem Standards                                         

ISO 8124-1 ASTM F963 EN-71

Tus txheej txheem                                                      

Tsis pub dhau 30 s tshem lub qho khoom ua si los ntawm txias, thov ib tug quab yuam ntawm (5 + 0.50) N mus rau lwm qhov chaw ntawm lub qho khoom ua si los ntawm ib tug hlau koob nrog ib lub cheeb ntawm 1 hli 0,1 hli thiab nrog ib tug ntsis voos kheej-kheej ntawm 0,5 hli 0,05 hli.