Wilmad - LabGlass 는 80년의 역사를 가진, EPR Tube를 처음 제조하고 발명한 회사입니다. 

Frequency(MHz Rating)의 기준을 정격한 미국 브랜드로, 튜브의 직경오차가 작아 정밀성이 매우 뛰어납니다.

(주)비케이인스트루먼트는 미국 Wilmad- LabGlass사의 공식대리점으로 보다 합리적인 가격에 다양한 제품을 취급하고 있습니다.

EPR Tube Product numbers that include “PQ” belong to our Precision Tube Family. Those with “SQ” are our Economy brand tubes. Precision brand EPR tubes hold 10-15 times tighter tolerance on the inner diameter, and >5 times smaller camber and concentricity over Economy Brand tube. Precision tubes are recommended for cw-experiments that require a constant filling factor or reproducibility on sample volume in the cavity. Clear Fused Quartz (CFQ) is purified from naturally occurring quartz so the existence of certain material radicals from mining is inevitable. Due to technological advancements the sensitivity of EPR has gradually increased. The direct result is that certain high Q cavities will pick up the signal from these impurities, especially in tubes of over 4 mm OD. In this case we recommend switching to Suprasil® EPR products which are made of synthetic material and suppress major impurity contents shown in Table 1 by the average of 2 orders of magnitude. Impurity analysis test results for Suprasil® are shown below:Chemical impurity analysis results for CFQ are shown below: Table 1: Impurity Analysis for Clear Fused Quartz (unit: ppm in weight)  Al   Ca   Cr   Cu   Fe   K   Li   Mg   Mn   Na   Ti   Zr  15  0.5  <0.05  <0.05  0.1  0.4  0.6  0.05  <0.05  0.3  1.1  0.7  Table 2: Impurity Analysis for Suprasil Quartz (unit: ppm in weight)  Al   Ca   Cr   Cu   Fe   K   Li   Mg   Mn   Na   Ti   Zr  <0.05  <0.05  <0.05  <0.05  <0.05  <0.05  <0.05  <0.05  <0.05  <0.05  <0.05  <0.05  For photochemistry studies, the cut-off wavelength is 265 nm for CFQ and 190 nm for Suprasil.