{"id":2222,"date":"2019-10-30T23:49:02","date_gmt":"2019-10-30T23:49:02","guid":{"rendered":"https:\/\/blogs.napier.ac.uk\/cwst\/?p=2222"},"modified":"2023-05-08T09:00:22","modified_gmt":"2023-05-08T09:00:22","slug":"strength-classes-not-in-en338","status":"publish","type":"post","link":"https:\/\/blogs.napier.ac.uk\/cwst\/strength-classes-not-in-en338\/","title":{"rendered":"Strength classes you won’t find in EN338"},"content":{"rendered":"

Not all strength classes are listed in EN338. Here are the main characteristic properties of some strength classes that appear in machine settings tables for machine controlled grading in Europe.\u00a0 (The other design properties can be calculated from the equations in EN384). Many of these are not available on the general market, or even in current use in a manufacturing process – but TR26 is a prime example of a commonly traded non-EN338 strength class (at least in the UK market).<\/p>\n

Note this previous advice though<\/a> – in this case, the primary references will be the latest tables of machine settings (known as AGRs or ITTs). These are available most easily from grading machine manufacturers, but can also be obtained through the SG18 group of Notified Bodies.\u00a0 Everything you will find in EN14081-4 is out of date \/ replaced by AGRs \/ ITTs.<\/p>\n

Update 8 May 2023: added some new strength classes and extra information\u00a0<\/p>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Strength class<\/th>5%ile bending strength (N\/mm2)<\/th>5%ile tensile strength (N\/mm2)<\/th>Mean modulus of elasticity (kN\/mm2)<\/th>5%ile density (kg\/m3)<\/th>Comments<\/th>\n<\/tr>\n<\/thead>\n
batten10<\/td>10<\/td><\/td>7<\/td>330<\/td>A grade for spruce tiling battens from UK and IE<\/td>\n<\/tr>\n
batten12<\/td>12<\/td><\/td>7.5<\/td>330<\/td>A grade for spruce tiling battens from UK and IE<\/td>\n<\/tr>\n
batten14<\/td>14<\/td><\/td>7.5<\/td>330<\/td>A grade for spruce tiling battens from UK and IE<\/td>\n<\/tr>\n
C16+<\/td>18.5<\/td><\/td>8<\/td>330<\/td>A grade for spruce from UK and IE<\/td>\n<\/tr>\n
C25T15<\/td>25<\/td><\/td>11.5<\/td>360<\/td><\/td>\n<\/tr>\n
C36T22<\/td>36.7<\/td><\/td>13<\/td>390<\/td><\/td>\n<\/tr>\n
E12<\/td>24<\/td><\/td>12<\/td>370<\/td>Stiffness grade<\/td>\n<\/tr>\n
E12,5<\/td>25<\/td><\/td>12.5<\/td>370<\/td>Stiffness grade<\/td>\n<\/tr>\n
E13<\/td>30<\/td><\/td>13<\/td>380<\/td>Stiffness grade<\/td>\n<\/tr>\n
E14<\/td>32<\/td><\/td>14<\/td>400<\/td>Stiffness grade<\/td>\n<\/tr>\n
E15<\/td>36<\/td><\/td>15<\/td>420<\/td>Stiffness grade<\/td>\n<\/tr>\n
E8,5<\/td>18<\/td><\/td>8.5<\/td>320<\/td>Stiffness grade<\/td>\n<\/tr>\n
ET24<\/td><\/td>24<\/td>18<\/td>590<\/td>For Eucalyptus globulus<\/td>\n<\/tr>\n
ET28<\/td><\/td>28<\/td>19<\/td>600<\/td>For Eucalyptus globulus<\/td>\n<\/tr>\n
ET30<\/td><\/td>30<\/td>20<\/td>610<\/td>For Eucalyptus globulus<\/td>\n<\/tr>\n
ET34<\/td><\/td>34<\/td>21<\/td>620<\/td>For Eucalyptus globulus<\/td>\n<\/tr>\n
ET38<\/td><\/td>38<\/td>22<\/td>630<\/td>For Eucalyptus globulus<\/td>\n<\/tr>\n
ET42<\/td><\/td>42<\/td>23<\/td>640<\/td>For Eucalyptus globulus<\/td>\n<\/tr>\n
L23<\/td><\/td>13<\/td>10<\/td>345<\/td><\/td>\n<\/tr>\n
L35<\/td><\/td>21<\/td>13<\/td>400<\/td><\/td>\n<\/tr>\n
L36<\/td><\/td>22<\/td>13<\/td>400<\/td><\/td>\n<\/tr>\n
L40<\/td><\/td>26<\/td>14<\/td>420<\/td><\/td>\n<\/tr>\n
L45<\/td><\/td>27<\/td>15<\/td>440<\/td><\/td>\n<\/tr>\n
LD18<\/td><\/td>18<\/td>12<\/td>370<\/td>EN1194:1999 Table B.1 (with density)<\/td>\n<\/tr>\n
NapierDA<\/td>35<\/td><\/td>13<\/td>460<\/td>A grade for Douglas-fir from UK and IE<\/td>\n<\/tr>\n
NapierDB<\/td>30<\/td><\/td>12<\/td>460<\/td>A grade for Douglas-fir from UK and IE<\/td>\n<\/tr>\n
NapierDC<\/td>16<\/td><\/td>10<\/td>400<\/td>A grade for Douglas-fir from UK and IE<\/td>\n<\/tr>\n
NapierDD<\/td>14<\/td><\/td>9<\/td>400<\/td>A grade for Douglas-fir from UK and IE<\/td>\n<\/tr>\n
NapierLA<\/td>30<\/td><\/td>13<\/td>480<\/td>A grade for larch from UK and IE<\/td>\n<\/tr>\n
NapierLB<\/td>28<\/td><\/td>12<\/td>440<\/td>A grade for larch from UK and IE<\/td>\n<\/tr>\n
NapierLC<\/td>21<\/td><\/td>9<\/td>400<\/td>A grade for larch from UK and IE<\/td>\n<\/tr>\n
NapierLD<\/td>20<\/td><\/td>8<\/td>390<\/td>A grade for larch from UK and IE<\/td>\n<\/tr>\n
NapierSA<\/td>25<\/td><\/td>11<\/td>375<\/td>A grade for spruce from UK and IE<\/td>\n<\/tr>\n
NapierSB<\/td>22<\/td><\/td>10<\/td>360<\/td>A grade for spruce from UK and IE<\/td>\n<\/tr>\n
NapierSC<\/td>16<\/td><\/td>8<\/td>320<\/td>A grade for spruce from UK and IE<\/td>\n<\/tr>\n
NapierSD<\/td>15<\/td><\/td>7<\/td>310<\/td>A grade for spruce from UK and IE<\/td>\n<\/tr>\n
TR26<\/td>28.3<\/td><\/td>11<\/td>370<\/td>A grade for trussed rafters in the UK<\/td>\n<\/tr>\n
uC12<\/td>12<\/td><\/td>6<\/td>290<\/td>A grade for loblolly and slash pine from Uruguay or Brazil<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n

There are also some old tension strength classes with no characteristic density (only “informative values”). These are based on EN1194:1999 Table B.1. Since they are no longer in use, the settings tables with these grades are being withdrawn. These classes are LS11, LS13, LS15, LS18, LS22, LS26. These map on to LD11, LD15, LD18, LD22, LD26 (these is no LD13), which in turn map on to the EN338 T classes (with the exception of LD18, which has slight mismatch of density).<\/p>\n\n\n\n

Many old tension strength classes match with EN338 T classes <\/p>\n\n\n\n

L16 Match for T10
L17 Match for T11
LD11 Match for T11
LT11 Match for T11
L22 Match for T13
L24 Match for T14
L25 Match for T14,5
LD15 Match for T14,5
LT14 Match for T14,5
L27 Match for T16
L30 Match for T18
LT18 Match for T18
LT21 Match for T21
LD22 Match for T22
LT22 Match for T22
LT24 Match for T24
LD26 Match for T26
LT26 Match for T26<\/p>\n","protected":false},"excerpt":{"rendered":"

Not all strength classes are listed in EN338. Here are the main characteristic properties of some strength classes that appear in machine settings tables for […]<\/a><\/p>\n<\/div>","protected":false},"author":57,"featured_media":927,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","jetpack_post_was_ever_published":false,"footnotes":""},"categories":[5],"tags":[68,10,20,27],"class_list":["post-2222","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-standards","tag-en338","tag-en384","tag-strength-grading","tag-timber-engineering"],"yoast_head":"\nStrength classes you won't find in EN338 - Centre for Wood Science & Technology<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.napier.ac.uk\/cwst\/strength-classes-not-in-en338\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Strength classes you won't find in EN338 - Centre for Wood Science & Technology\" \/>\n<meta property=\"og:description\" content=\"Not all strength classes are listed in EN338. 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