ISO12944 C4 Environment Coatings

About C4 Environments

C4 Environments externally typically are industrial areas and / or coastal areas with moderate salinity. Internally, typical environments include chemical plants, swimming pools and coastal shipyards.

Scroll to the bottom of this page for a full list of suppliers and their specifications.

Download the manufacturer specifications for steel systems below:

Jotun Penguard Express ZP
A fast drying, two part amine cured epoxy zinc phosphate pigmented, high solids, high build product formulated for exposed structural steel.

From £66.68 £55.57
Jotun Penguard HB
A two part polyamide cured, high molecular weight epoxy coating, designed as a high build, all purpose coating for new construction.

From £59.54 £49.62
Jotun Hardtop XP
A hard wearing top coat for use in aggressive atmospheric exposure. Network Rail approved. Highways Approved Item No 168

From £77.80 £64.83
Jotun Pilot QD Primer
A one part oxidatively drying alkyd coating, that is a fast drying, high build, zinc phosphate pigmented primer or mid coat in atmospheric environment...

From £32.87 £27.39
Jotun Penguard HSP ZP
A two component amine cured epoxy coating designed for new construction where short dry to handle and over coating times are required.

From £189.18 £157.65
Jotun Hardtop AX
A two component chemically curing high gloss aliphatic acrylic polyurethane coating that offers resistance to UV degradation and good chemical resista...

From £95.94 £79.95
Jotun Barrier 80
A fast drying, anti corrosive, high solids 2 part polyamide cured zinc rich epoxy coating.

£218.36 £181.97
Jotun Pilot II
A single component oxidatively drying alkyd coating for engines, topside, deck and superstructure.

From £45.72 £38.10
PPG SigmaCover 410 MIO
Two component high solids, high build, polyamide cured epoxy coating designed for general purpose protection to steel and concrete structures.

From £284.22 £236.85
PPG PSX 700 Engineered Siloxane
For steel from PPG Sigma, Ameron. Highways Approved Item No.185.

From £305.62 £254.68
PPG SigmaDur 550 H
Formally PPG SigmaDur 568. A 2 Part High Solids, High Build Polyurethane Gloss Finish.

From £74.40 £62.00
PPG SigmaShield 880
A two component high build polyamine adduct cured epoxy coating. Primarily designed for use in offshore splash zone maintenance.

From £80.23 £66.86
PPG SigmaZinc 68 SP
A two component, high solids polyamine adduct cured zinc rich epoxy primer for aggressive environments.

£232.81 £194.01
PPG SigmaFast 278
A 2 component high solids rapid drying zinc phosphate epoxy Primer and build coat that has been formulated to cure at low temperatures down to -5°...

From £58.80 £49.00
Selemix 7-410 Epoxy Topcoat
A 2 pack epoxy enamel which offers good gloss and a hard durable film to bare and sand blasted steel.

From £77.15 £64.29
Selemix 2.705.050X PUR 2 Pack Primer
A 2 pack primer offering excellent adhesion and protection properties for steel in the harshest of environments up to C5M-low.

From £231.95 £193.29
Selemix 7-110 2 Pack Acrylic Topcoat
A very high gloss, excellent colour fast and resistance to atmospheric attack product, available in RAL, BS 4800 or NCS Colours.

From £121.51 £101.26
Selemix 7-120 2 Pack Acrylic UHS Topcoat
Provide a very high gloss finish and excellent protection for steel in highly aggressive environments, up to C5M-low rated.

From £163.94 £136.62
Selemix 7-413 2 Pack Epoxy Primer
7-413 can be applied wet on wet to bare or galvanised steel, phosphate steel, light alloys, stainless or previously coated steel and GRP.

From £95.81 £79.84
Selemix 7-512 2 Pack Polyurethane Extra Gloss Topcoat
Provides a high gloss and very high level of chemical and atmospheric resistance in harsh environments up to C5-M & C5-I High.

From £92.70 £77.25
Sherwin Williams Acrolon 7300 Acrylic Finish
A high solids, tin free, PU with fast drying and high gloss attributes for use where long term exterior gloss and colour retention is required.

From £104.33 £86.94
Sherwin Williams Macropoxy 646 Epoxy Primer Finish
A versatile high performance polyamide cured epoxy designed to fulfil the needs of both new construction and maintenance painting to steel, aluminium ...

From £347.21 £289.34
Sherwin Williams Macropoxy 400 - Formerly Leighs Epigrip C400V3
A multi functional epoxy coating suitable for the protection of steelwork in a range of exposure environments from C1 to C5.

From £105.97 £88.31
Sherwin Williams Acrolon 1850 Acrylic Epoxy Finish
A two pack isocyanate free finish based on an acrylic epoxy binder system. NORSOK M501 Rev 6 System 1.

From £121.69 £101.41
Sherwin Williams Macropoxy 267 - Formerly Leighs Epigrip C267V3
A high solids 2 pack epoxy, pigmented with MIO (Micaceous Iron Oxide) certified under Highways Agency No112.

From £119.08 £99.23
Sherwin Williams Zinc Clad IV EU Formerly M501
An 2 pack epoxy zinc rich anti corrosive primer for the protection of steel surfaces.

From £416.46 £347.05
Sika SikaCor EG5
A 2-pack acrylic polyurethane ideally suited to all environments where both protective and decorative considerations are present.

From £98.46 £82.05
International Interzinc 52
A two component, anti-corrosive metallic zinc rich epoxy primer.

From £455.17 £379.31

CATEGORY	BRAND	SYSTEM	DRY FILM THICKNESS	EXPECTED DURABILITY
C4 Low	Jotun	Jotun Pilot QD Jotun Pilot II or Pioner Topcoat	120µm 40µm	< 5 Years
	Jotun	Jotun Penguard HSP ZP or Penguard Express ZP Jotun Hardtop AX or Hardtop XP	70µm 50µm	< 5 Years
	Jotun	Jotun Barrier 80 Jotun Hardtop AX or Hardtop XP	50µm 70µm	< 5 Years
	Jotun	Jotun Barrier 80	60µm 180µm 60µm	< 5 Years
	PPG	PPG Sigmafast 278	150µm	< 5 Years
	PPG	PPG PSX 700	125µm	< 5 Years
	PPG	PPG Sigmafast 278 PPG Sigmadur 550 H	100µm 50µm	< 5 Years
	Selemix	Selemix 7-413 Selemix 7-410	195µm total	< 5 Years
	Selemix	Selemix 7-413</a Selemix 7-110	220µm total	< 5 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400	120µm	< 7 Years
	Sherwin Williams	Sherwin Williams Macropoxy 646	120µm	< 7 Years
	Sherwin Williams	Sherwin Williams Macropoxy 267	120µm	< 7 Years
	Sherwin Williams	Sherwin Williams Envirolastic 2500	120µm	< 7 Years
C4 Medium	Carboline	Carboline Carboxane 2000	150µm	7 - 15 Years
	Carboline	Carboline Carboxane 2000 Satin	150µm	7 - 15 Years
	Carboline	Carboline Carboxane 2100 FC	150µm	7 - 15 Years
	Hempel	Hempel Hempaprime Multi 500 Winter Hempel Hemucryl 48120	100µm 80µm	7 - 15 Years
	Jotun	Jotun Pilot QD Jotun Pilot QD Jotun Pilot II or Pioner TC	80µm 80µm 40µm	5 - 15 Years
	Jotun	Jotun Barrier 80 Jotun Hardtop AX or Hardtop XP	80µm 100µm	5 - 15 Years
	Jotun	Jotun Penguard HSP ZP or Penguard Express ZP Jotun Hardtop AX or Hardtop XP	120µm 60µm	5 - 15 Years
	Jotun	Jotun Barrier 80 Jotun Hardtop AX or Hardtop XP	60µm 100µm	5 - 15 Years
	PPG	PPG Sigmafast 278	150µm	5 - 15 Years
	PPG	PPG PSX 700	125µm	5 - 15 Years
	PPG	PPG Sigmafast 278 PPG Sigmadur 550 H	100µm 50µm	5 - 15 Years
	PPG	PPG Sigmafast 278 PPG PSX 700	60µm 125µm	5 - 15 Years
	PPG	PPG Sigmazinc 68 SP PPG PSX 700	50µm 100µm	5 - 15 Years
	PPG	PPG Sigmazinc 68 SP PPG Sigmafast 278 PPG Sigmadur 550 H	50µm 80µm 50µm	5 - 15 Years
	International	International Intercure 251HS International Interthane 990	130µm 50µm	5 - 15 Years
	International	International Intercure 4500	180µm	5 - 15 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7220 Sherwin Williams Acrolon 7300	125µm 55µm	7 - 15 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7220 Sherwin Williams Acrolon 1850	100µm 80µm	7 - 15 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7240 Sherwin Williams Acrolon 1850	100µm 80µm	7 - 15 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7240 Sherwin Williams Acrolon 7300	125µm 55µm	7 - 15 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Acrolon 7300	125µm 55µm	7 - 15 Years
	Sherwin Williams	Sherwin Williams Macropoxy 646 Sherwin Williams Acrolon 7300	125µm 55µm	7 - 15 Years
	Sherwin Williams	Sherwin Williams Envirolastic 2500	180µm	7 - 15 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400	180µm	7 - 15 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Macropoxy 400	90µm 90µm	7 - 15 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Acrolon 1850	100µm 80µm	7 - 15 Years
C4 High	Carboline	Carboline Carbozinc 858 Carboline Carboguard 635 Carboline Carbothane 134 HG	225µm	15 - 25 Years
	Carboline	Hot Dip Galvanized Carboline Carboguard 635 Carboline Carbothane 134 HG	175µm	15 - 25 Years
	Carboline	Carboline Carboguard 690 Carboline Carbothane 134 HG	175µm	15 - 25 Years
	Carboline	Carboline Carbozinc 858 Carboline Carboguard 60 Carboline Carbothane 134 HG	200µm	15 - 25 Years
	Carboline	Carboline Carbozinc 859 Carboline Carboguard 893 SG	200µm	15 - 25 Years
	Carboline	Carboline Carboguard 60 Carboline Carboguard 60	200µm	15 - 25 Years
	Carboline	Carboline Carbozinc 808 Carboline Carboguard 890	175µm	15 - 25 Years
	Carboline	Carboline Carbozinc 859 VOC Carboline Carboguard 890 LT	275µm	15 - 25 Years
	Carboline	Carboline Carbozinc 859 Carboline Carboguard 890	300µm	15 - 25 Years
	Carboline	Carboline Carbomastic 615 AL Carboline Carbothane 134 HG	250µm	15 - 25 Years
	Hempel	Hempel Hempadur Avantguard 750 Hempel Hempathane HS 55610	75µm 125µm	15 - 25 Years
	Hempel	Hempel Hempadur Avantguard 750 Hempel Hempaprime Multi 500	60µm 140µm	15 - 25 Years
	Hempel	Hempel Hempadur Avantguard 750 Hempel Hempadur 47300	60µm 140µm	15 - 25 Years
	Hempel	Hempel Hempadur Avantguard 550 Hempel Hempaprime Multi 500 Hempathane HS 55610	40µm 100µm 60µm	15 - 25 Years
	Hempel	Hempel Hempadur Avantguard 550 Hempathane HS 55610	75µm 125µm	15 - 25 Years
	Hempel	Hempel Hempadur Avantguard 550 Hempel Hempathane Fast Dry 55750	60µm 140µm	15 - 25 Years
	Hempel	Hempel Hempaprime Multi 500 Hempel Hempaprime Multi 500	120µm 120µm	15 - 25 Years
	Hempel	Hempel Hempaprime Multi 500 Hempathane HS 55610	180µm 60µm	15 - 25 Years
	Hempel	Hempel Hempaprime Multi 500 Hempel Hempathane Fast Dry 55750	180µm 60µm	15 - 25 Years
	Hempel	Hempel Hempaprime Multi 500 Hempel Hemucryl 48120	160µm 80µm	15 - 25 Years
	Hempel	Hempel Hempadur Mastic 45880/W Hempathane HS 55610	180µm 60µm	15 - 25 Years
	Hempel	Hempel Hempadur Fast Dry 17410 Hempel Hempathane HS 55610	120µm 120µm	15 - 25 Years
	Hempel	Hempel Hempadur 47300	240µm	15 - 25 Years
	Hempel	Hempel Hempadur 47300 Hempel's Pro Acrylic 55883	190µm 50µm	15 - 25 Years
	Hempel	Hempel Hempadur Speed-Dry ZP 500 Hempel Hempathane Fast Dry 55750	180µm 60µm	15 - 25 Years
	Hempel	Hempel Hempadur Speed-Dry ZP 600 Hempel Hempathane HS 55610	160µm 80µm	15 - 25 Years
	Hempel	Hempel Hempathane Fast Dry 55750 Hempel Hempathane Fast Dry 55750	120µm 120µm	15 - 25 Years
	Hempel	Hempel Hempatex High-Build 46410 Hempel Hempatex High-Build 46410	120µm 120µm	15 - 25 Years
	Hempel	Hempel Hempatex High-Build 46410 Hempel Hempatex High-Build 46410 Hempel Hempatex Enamel 56360	100µm 100µm 40µm	15 - 25 Years
	International	International Interzinc 52 International Intergard 475HS International Interthane 990	60µm 90µm 50µm	> 15 Years
	Jotun	Jotun Pilot QD Jotun Pilot QD Jotun Pilot II or Pioner Topcoat	100µm 100µm 60µm	> 15 Years
	Jotun	Jotun Barrier 80 Jotun Penguard HSP ZP or Penguard Express ZP Jotun Hardtop AX or Hardtop XP	60µm 120µm 60µm	> 15 Years
	Jotun	Jotun Penguard HSP ZP or Penguard Express ZP Jotun Hardtop AX or Hardtop XP	180µm 60µm	> 15 Years
	Jotun	Jotun Barrier 80 Jotun Penguard HSP ZP or Penguard Express ZP Jotun Hardtop AX or Hardtop XP	60µm 80µm 60µm	> 15 Years
	PPG	PPG SigmaFast 278 PPG SigmaFast 278	100µm 100µm	> 15 Years
	PPG	PPG SigmaFast 278 PPG SigmaDur 550H	170µm 50µm	> 15 Years
	PPG	PPG SigmaFast 278 PPG PSX 700	60µm 125µm	> 15 Years
	PPG	PPG Amerlock 2 PPG Sigmadur 550US	175µm 75µm	> 15 Years
	PPG	PPG Amerlock 2 PPG PSX 700	175µm 75µm	> 15 Years
	PPG	PPG Sigmazinc 68 SP PPG PSX 700	50µm 100µm	> 15 Years
	PPG	PPG Sigmazinc 68 SP PPG PSX 700	50µm 125µm	> 15 Years
	PPG	PPG Sigmazinc 68 SP PPG SigmaFast 278 PPG Sigmadur 550 H	50µm 80µm 50µm	> 15 Years
	PPG	PPG Sigmazinc 68 SP PPG Sigmacover 410 MIO PPG Sigmadur 550 H	60µm 100µm 60µm	> 15 Years
	Sika	Sika Poxicolor Rapid Sika SikaCor EG-120	100µm 100µm	> 15 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7220 Sherwin Williams Fast Clad 7220 Sherwin Williams Acrolon 1850	80µm 80µm 80µm	15 - 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Acrolon 7300	190µm 50µm	15 - 25 Years
	Sherwin Williams	Sherwin Williams Sher-Loxane 800 Sherwin Williams Sher-Loxane 800	120µm 120µm	15 - 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Envirolastic 2500	140µm 100µm	15 - 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Macropoxy 400	120µm 120µm	15 - 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 646 Sherwin Williams Acrolon 7300	190µm 50µm	15 - 25 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7220 Sherwin Williams Acrolon 7300	190µm 50µm	15 - 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Acrolon 1850	160µm 80µm	15 - 25 Years
	Sika	Sika SikaCor 6630 High Solid Sika SikaCor 6630 High Solid	100µm 100µm
	Sika	Sika SikaCor EG-1 Sika SikaCor EG-5	80µm 80µm
	Sika	Sika SikaCor 2440 MF Sika SikaCor EG-5	190µm 50µm
	Sika	Sika Poxicolor Rapid Sika SikaCor EG-120	120µm 120µm
	Sika	Sika Permacor 2204 VHS Sika SikaCor EG-5	160µm 80µm
	Sika	Sika sikaCor 6630 High Solid Sika SikaCor 6630 High Solid Sika SikaCor 6630 High Solid	80µm 100µm 100µm
C4 Very High	Hempel	Hempel Hempadur 15553 Hempel Hempathane HS 55610	80µm 120µm	> 25 Years
	Hempel	Hempel Hempadur 47300 Hempel Hempathane Speed-Dry Topcoat 250	250µm 50µm	> 25 Years
	Hempel	Hempel's Epoxy Primer HV 15410 Hempel Hempadur 47300 Hempel Hempathane Topcoat 55210	50µm 100µm 50µm	> 25 Years
	Hempel	Hempel Hempaprime Multi 500 Hempel Hempathane Fast Dry 55750	220µm 80µm	> 25 Years
	Hempel	Hempel Hempaprime Multi 500 Hempel Hempathane HS 55610	220µm 80µm	> 25 Years
	Hempel	Hempel Hempaprime Multi 500 Hempel Hempathane HS 55610	240µm 60µm	> 25 Years
	Hempel	Hempel Hempaprime Multi 500 Hempel Hempathane HS 55610	240µm 60µm	> 25 Years
	Hempel	Hempel Hempadur Speed-Dry ZP 600 Hempel Hempathane Fast Dry 55750	200µm 100µm	> 25 Years
	Hempel	Hempel Hempadur Avantguard 750 Hempel Hempaprime Multi 500 Hempel Hempathane Speed-Dry Topcoat 250	60µm 120µm 80µm	> 25 Years
	Hempel	Hempel Hempadur Avantguard 750 Hempel Hempadur 47300 Hempel's Pro Acrylic 55883	60µm 120µm 80µm	> 25 Years
	Hempel	Hempel Hempadur Avantguard 750 Hempel Hempadur Mastic 45880/W Hempel Hempathane HS 55610	60µm 120µm 80µm	> 25 Years
	Hempel	Hempel Hempadur Avantguard 750 Hempel Hemucryl 48120 Hempel Hemucryl 48120	60µm 100µm 100µm	> 25 Years
	Hempel	Hempel Hempadur Avantguard 750 Hempel Hempaprime Multi 500 Hempel Hempathane HS 55610	50µm 120µm 60µm	> 25 Years
	Hempel	Hempel Hempadur Avantguard 550 Hempel Hempadur 47300 Hempel Hempathane Fast Dry 55750	60µm 120µm 80µm	> 25 Years
	Jotun	Jotun Barrier 80 Jotun Penguard HSP ZP or Penguard Express ZP Jotun Hardtop AX or Hardtop XP	60µm 180µm 60µm	> 25 Years
	Jotun	Jotun Penguard HSP ZP or Penguard Express ZP Jotun Penguard HSP ZP or Penguard Express ZP Jotun Hardtop AX or Hardtop XP	120µm 120µm 60µm	> 25 Years
	Jotun	Jotun Barrier 80 Jotun Penguard HSP ZP or Penguard Express ZP Jotun Hardtop AX or Hardtop XP	60µm 140µm 60µm	> 25 Years
	PPG	PPG SigmaFast 278 PPG SigmaFast 278	125µm 125µm	> 25 Years
	PPG	PPG SigmaFast 278 PPG Sigmadur 550 H	200µm 80µm	> 25 Years
	PPG	PPG SigmaFast 278 PPG SigmaFast 278 PPG Sigmadur 550 H	120µm 120µm 80µm	> 25 Years
	PPG	PPG Sigmashield 880	300µm	> 25 Years
	PPG	PPG Sigmazinc 68 SP PPG PSX 700	75µm 125µm	> 25 Years
	PPG	PPG Sigmazinc 68 SP PPG Sigmafast 278 PPG Sigmadur 550 H	60µm 160µm 50µm	> 25 Years
	PPG	PPG Sigmazinc 68 SP PPG Sigmacover 410 MIO PPG Sigmadur 550 H	60µm 160µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Macropoxy 400 Sherwin Williams Acrolon 7300	125µm 125µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 646 Sherwin Williams Macropoxy 646 Sherwin Williams Acrolon 7300	125µm 125µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Macropoxy 400	150µm 150µm	> 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400	300µm	> 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Acrolon 7300	250µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Acrolon 1850	225µm 75µm	> 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 646 Sherwin Williams Acrolon 7300	250µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 646 Sherwin Williams Acrolon 1850	225µm 75µm	> 25 Years
	Sherwin Williams	Sherwin Williams Zinc Clad IV Sherwin Williams Macropoxy 267 Sherwin Williams Acrolon 7300	60µm 150µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Zinc Clad IV EU Sherwin Williams Macropoxy 646 Sherwin Williams Acrolon 7300	60µm 150µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Zinc Clad IV EU Sherwin Williams Macropoxy 267 Sherwin Williams Acrolon 7300	60µm 150µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Zinc Clad IV EU Sherwin Williams Envirolastic 2500	60µm 200µm	> 25 Years
	Sherwin Williams	Sherwin Williams Zinc Clad IV EU Sherwin Williams Sher-Loxane 800 Sherwin Williams Sher-Loxane 800	60µm 100µm 100µm	> 25 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7220 Sherwin Williams Envirolastic 2500	125µm 175µm	> 25 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7220 Sherwin Williams Fast Clad 7220 Sherwin Williams Acrolon 1850	110µm 110µm 80µm	> 25 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7220 Sherwin Williams Fast Clad 7240 Sherwin Williams Acrolon 1850	75µm 145µm 80µm	> 25 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7220 Sherwin Williams Fast Clad 7220 Sherwin Williams Acrolon 7300	125µm 125µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Fast Clad 7220 Sherwin Williams Fast Clad 7240 Sherwin Williams Acrolon 7300	75µm 175µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Macropoxy 400 Sherwin Williams Envirolastic 2500	175µm 125µm	> 25 Years
	Sherwin Williams	Sherwin Williams Zinc Clad IV Sherwin Williams Macropoxy 400 Sherwin Williams Acrolon 7300</a	60µm 150µm 50µm	> 25 Years
	Sherwin Williams	Sherwin Williams Zinc Clad IV EU Sherwin Williams Macropoxy 400 Sherwin Williams Acrolon 1850</a	60µm 150µm 50µm	> 25 Years