{"id":389405,"date":"2024-10-20T03:49:53","date_gmt":"2024-10-20T03:49:53","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iso-18369-42017-2\/"},"modified":"2024-10-26T07:01:51","modified_gmt":"2024-10-26T07:01:51","slug":"bs-en-iso-18369-42017-2","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iso-18369-42017-2\/","title":{"rendered":"BS EN ISO 18369-4:2017"},"content":{"rendered":"

This document specifies the methods of testing the physicochemical properties of contact lens materials. These are extraction, rigid lens flexure and breakage, oxygen permeability, refractive index and water content.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nNational foreword <\/td>\n<\/tr>\n
4<\/td>\nEuropean foreword <\/td>\n<\/tr>\n
6<\/td>\nForeword <\/td>\n<\/tr>\n
9<\/td>\n1 Scope
2 Normative references
3 Terms and definitions
4 Physicochemical properties of contact lenses
4.1 Repeatability, test methods and units of measure <\/td>\n<\/tr>\n
10<\/td>\n4.2 Extractables
4.2.1 General
4.2.2 Principle
4.2.3 Apparatus <\/td>\n<\/tr>\n
11<\/td>\n4.2.4 Reagents <\/td>\n<\/tr>\n
12<\/td>\n4.2.5 Test samples
4.2.6 Test procedure
4.2.7 Calculation of results <\/td>\n<\/tr>\n
13<\/td>\n4.2.8 Test report
4.3 Rigid lens flexural deformation and rupture
4.3.1 Principle
4.3.2 Sampling <\/td>\n<\/tr>\n
14<\/td>\n4.3.3 Preparation of samples
4.3.4 Apparatus <\/td>\n<\/tr>\n
16<\/td>\n4.3.5 Procedure
4.3.6 Test result <\/td>\n<\/tr>\n
17<\/td>\n4.4 Oxygen permeability
4.4.1 General
4.4.2 Common elements of the methods <\/td>\n<\/tr>\n
18<\/td>\n4.4.3 Polarographic method <\/td>\n<\/tr>\n
26<\/td>\n4.4.4 Normalization of the corrected oxygen permeability using reference lenses <\/td>\n<\/tr>\n
27<\/td>\n4.4.5 Test report
4.5 Refractive index
4.5.1 General
4.5.2 Abbe refractometer <\/td>\n<\/tr>\n
28<\/td>\n4.5.3 Test samples
4.5.4 Procedure <\/td>\n<\/tr>\n
29<\/td>\n4.5.5 Expression of test results
4.5.6 Test report <\/td>\n<\/tr>\n
30<\/td>\n4.6 Water content
4.6.1 General
4.6.2 Gravimetric determination of water content\/absorption by loss on drying using an oven <\/td>\n<\/tr>\n
32<\/td>\n4.6.3 Test report
5 Test report <\/td>\n<\/tr>\n
33<\/td>\nAnnex A (informative) Determination of oxygen permeability using the coulometric method <\/td>\n<\/tr>\n
40<\/td>\nAnnex B (informative) Determination of water content by refractive index <\/td>\n<\/tr>\n
41<\/td>\nAnnex C (informative) Calculation of oxygen permeability of hydrogel contact lenses based on water content <\/td>\n<\/tr>\n
42<\/td>\nAnnex D (informative) Measurement of refractive index using a prism coupling device <\/td>\n<\/tr>\n
44<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Ophthalmic optics. Contact lenses – Physicochemical properties of contact lens materials<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2018<\/td>\n46<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":389411,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[145,2641],"product_tag":[],"class_list":{"0":"post-389405","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-11-040-70","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/389405","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/389411"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=389405"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=389405"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=389405"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}