SMR 规格方案 - Mech Chem Laboratory (MCL)

Table 1 – SMR SPECIFICATION FOR GRADING PURPOSES

Parameter	SMR GRADE
Parameter	SMR 10	SMR 20	SMR 10CV	SMR 20CV	SMR CV50	SMR CV60	SMR L	SMR 5	SMR GP
Colour Coding, Marker	Brown	Red	Violet	Light Yellow	Yellow	Yellow	Green	Green	Blue
Dirt (max, % wt)	0.08	0.16	0.08	0.16	0.02	0.02	0.02	0.05	0.08
Ash (max, % wt)	0.75	1.00	0.75	1.00	0.50	0.50	0.50	0.60	0.75
N2 (min, % wt) (max, % wt)	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15
N2 (min, % wt) (max, % wt)	0.55	0.55	0.55	0.55	0.55	0.55	0.55	0.55	0.55
VM (max, % wt)	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50
P0 (min)	30	30	NA	NA	NA	NA	35	30	NA
PRI (min) (mean value)	≥ 50	≥ 40	≥ 50	≥ 40	≥ 60	≥ 60	≥ 60	≥ 60	≥ 50
PRI (min) (mean value)	≥ 50	≥ 40	≥ 60	≥ 50	≥ 70	≥ 70	≥ 70	≥ 70	≥ 60
WASHT (DP)	NA	NA	≤ 8 #	≤ 8 #	≤ 8	≤ 8	NA	NA	≤ 8 #
VR (ML[1’+4’]@100°C)	NA	NA	55-67	60-72	45-55	55-65	NA	NA	60-72
Lovibond Colour individual value (max) range (max)	NA NA	NA NA	NA NA	NA NA	NA NA	NA NA	6 2	NA NA	NA NA


Cure	NA	NA	R	R	R	R	NA	NA	R

CV = constant viscosity GP – general purpose L = light R = curable (based on rheography)

^# Conduct MASHT if 6 < DP ≤ 8

Regrading: SMR 10 ↔ SMR 20 ; SMR 10CV ↔ SMR 20CV (not conform to the stated values for dirt, ash & PRI parameters).

SMR CV50 ↔ SMR CV60 (conform to the stated Mooney viscosity value).

MATERIAL COMPOSITION OF SMR GRADES

GRADE	MATERIAL
SMR 10, SMR20, SMR 10CV, SMR 20CV	Field grade material
SMR CV50, SMR CV60, SMR L	Whole field latex bulked and acid coagulated under controlled conditions.
SMR 5	Sheet material (RSS, ADS, Uss or mixture) subjected to further crumb processing.
SMR 5RSS	Direct baling of RSS.
SMR 5ADS	Direct baling of ADS
SMRGP	60% latex/sheet material; 40% cup lump.

Cup lump or field coagulum is rubber naturally coagulated in the tapping cup or other suitable vessel.
Field grade material consists of cup lump or field coagulum with a minor proportion of latex/sheet material.