{"id":286193,"date":"2024-10-19T19:23:25","date_gmt":"2024-10-19T19:23:25","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-1721995\/"},"modified":"2024-10-25T16:16:35","modified_gmt":"2024-10-25T16:16:35","slug":"bs-en-1721995","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-1721995\/","title":{"rendered":"BS EN 172:1995"},"content":{"rendered":"

PDF Catalog<\/h4>\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
1<\/td>\nBRITISH STANDARD <\/td>\n<\/tr>\n
2<\/td>\nCommittees responsible for this British\ufffdStandard <\/td>\n<\/tr>\n
3<\/td>\nShort Contents <\/td>\n<\/tr>\n
6<\/td>\nForeword
Foreword to Amendment A1
Foreword to Amendment A2 <\/td>\n<\/tr>\n
7<\/td>\nContents <\/td>\n<\/tr>\n
8<\/td>\n1 Scope
2 Normative references
3 Designation and marking
4 Requirements
4.1 Permissible transmittance and scale numbers
4.2 General transmittance requirements <\/td>\n<\/tr>\n
9<\/td>\nTable 1 – Permissible transmittance for filters without a requirement for infra-red protection
Table 2 – Permissible transmittance for filters with a requirement for infra-red protection
4.3 Special transmittance requirements <\/td>\n<\/tr>\n
10<\/td>\n5 Test method
5.1 Permissible transmittance and scale numbers
5.2 General transmittance requirements
5.3 Special transmission requirements <\/td>\n<\/tr>\n
11<\/td>\nTable 3 – Irradiance for testing the darkened state of photochromic lenses
Table 4 – Measurement conditions for the different luminous transmittance values <\/td>\n<\/tr>\n
12<\/td>\n6 Filters not suitable for driving and road use
Figure 1 – Symbol \u201cNot suitable for driving and road use\u201d <\/td>\n<\/tr>\n
13<\/td>\nAnnex A (informative)
Use of sunglare filters
A.1 Daytime
A.2 Reduced light
A.3 Reduction of reflection <\/td>\n<\/tr>\n
14<\/td>\nA.4 Photochromic sunglare filters
A.5 Polarizing sunglare filters
Annex B (normative)
Definitions
B.1 Scale number
B.2 Relative visual attenuation quotient <\/td>\n<\/tr>\n
15<\/td>\nB.3 Infra-red transmittance <\/td>\n<\/tr>\n
16<\/td>\nAnnex C (normative)
Standard illuminant D <\/td>\n<\/tr>\n
17<\/td>\nAnnex D (normative)
Test for determining the axis of polarization
Figure D.1 – Apparatus for determination of axis polarization
D.1 Apparatus
D.2 Procedure <\/td>\n<\/tr>\n
18<\/td>\nAnnex E (informative)
Test for determination of fatigue of photochromic materials
E.1 Apparatus
E.2 Preparation of samples
E.3 Procedure
E.4 Evaluation
Annex F (informative) <\/td>\n<\/tr>\n
19<\/td>\nAnnex ZA (informative)
Clauses of this European Standard addressing essential requirements or other provis… <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Specification for sunglare filters used in personal eye-protectors for industrial use<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2002<\/td>\n20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":286201,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-286193","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/286193","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\/286201"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=286193"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=286193"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=286193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}